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Finance
Loans, savings, investing, debt, property, taxes, and business money.
401k Calculator
Estimate the growth of your 401(k) retirement savings, including employer matching contributions.
72(t) Calculator
Calculate Substantially Equal Periodic Payments (SEPP) to avoid early withdrawal penalties from IRAs.
Activity Depreciation Calculator
Calculate depreciation from asset usage such as miles, machine cycles, or operating hours.
Amortization Calculator
View your loan amortization schedule and see how your principal balance decreases over time.
Amortization Schedule Calculator: Equal Principal Payments
Create a loan schedule with the same principal amount paid every period and declining total payments.
Annuity Calculator
Calculate the future value of a fixed annuity investment.
Annuity on Loan Table Creator
Create an equal-payment loan amortization table for an ordinary annuity or annuity due.
Annuity Payout Calculator
Calculate the monthly income you can receive from a fixed annuity.
APR Calculator
Calculate the Annual Percentage Rate (APR) of a loan, which includes interest and fees.
APY Calculator
Convert an Annual Percentage Rate (APR) to Annual Percentage Yield (APY) based on compounding frequency.
Asset Allocation Calculator
Visualize your portfolio's asset allocation.
Auto Lease Calculator
Calculate monthly auto lease payments based on negotiated price, residual value, and money factor.
Auto Loan Calculator
Calculate your monthly car payments, factoring in trade-in value and sales tax.
Average Return Calculator
Calculate the Arithmetic Mean and Geometric Mean (CAGR) of a series of investment returns.
Bid-Ask Calculator
Calculate bid-ask spread, midpoint, spread percentage, and trade values for a quoted security.
Boat Loan Calculator
Estimate monthly payments for a boat or yacht loan, which typically feature longer terms than auto loans.
Bond Calculator
Calculate the theoretical price and current yield of a bond based on its coupon rate and yield to maturity.
Budget Calculator
Plan your monthly budget by categorizing income and expenses.
Business Loan Calculator
Calculate monthly payments and total costs for a business term loan, including origination fees.
Canadian Mortgage Calculator
Calculate mortgage payments for Canada, including CMHC insurance estimates and semi-annual compounding.
Cash Back Calculator
Estimate gross and net cash back after an optional reward cap and annual fee.
Cash Back vs Low Interest
Compare a cash back rebate with a higher interest rate versus a lower interest rate with no rebate.
CD Calculator
Calculate the earnings and total balance of a Certificate of Deposit (CD) over time.
Checkbook Balance Calculator
Reconcile a bank statement balance with outstanding checks, deposits in transit, fees, interest, and the check register.
Checkbook Calculator
Apply a list of deposits and withdrawals to an opening balance and create a running register.
College Cost Calculator
Estimate the future cost of college and determine if your current savings plan is on track.
Commission Calculator
Calculate sales commission, base pay, bonus, and total earnings.
Compound Interest Calculator
Project investment growth with regular monthly contributions and selectable compounding.
Credit Card Calculator
Calculate how long it will take to pay off your credit card balance or determine the monthly payment needed to be debt-free by a specific date.
Credit Card Payoff Calculator
Find payoff time from a payment or the payment needed for a chosen payoff period.
Credit Cards Payoff Calculator
Calculate the fastest way to pay off multiple credit cards using the Avalanche or Snowball method.
Currency Appreciation and Depreciation Calculator
Measure the appreciation or depreciation of a base currency when its quoted exchange rate changes.
Currency Calculator
Convert an amount using an exchange rate you enter. No live API is required.
Debt Consolidation Calculator
Determine if consolidating your debts into a single loan can save you money on interest or lower your monthly payments.
Debt Payoff Calculator
Create a debt payoff plan using the Snowball or Avalanche method to become debt-free faster.
Debt Ratios Calculator
Calculate common solvency ratios from balance-sheet and income-statement figures.
Debt-to-Income Ratio Calculator
Calculate front-end and back-end monthly debt-to-income ratios.
Debt-to-Income Ratio Calculator
Calculate your DTI ratio to see if you qualify for a mortgage or other loans.
Deferred Fixed Annuity Calculator
Estimate accumulation during a deferral period and level withdrawals during a fixed payout period.
Depreciation Calculator
Calculate the depreciation of an asset over its useful life using Straight-Line or Double-Declining Balance methods.
Discount Calculator
Find the sale price, savings, optional tax, and effective discount.
Down Payment Calculator
Convert a down payment between money and percent, then estimate loan and cash needed.
Equivalent Interest Rate Calculator
Convert a nominal annual rate with one compounding frequency to an equivalent nominal rate with another frequency.
Estate Tax Calculator
Estimate the federal estate-tax amount above the 2026 basic exclusion using a simplified top-rate model.
FHA Loan Calculator
Calculate FHA mortgage payments including Upfront and Annual Mortgage Insurance Premiums (MIP).
Finance Calculator
Analyze your monthly cash flow, savings rate, and potential annual savings.
Fixed Declining Balance Depreciation Calculator
Calculate a fixed declining-balance depreciation rate and annual schedule that approaches salvage value.
Future Value Calculator
Grow a present amount at a fixed rate with selectable compounding.
Future Value of $1 Annuity Table (FVIFA) Calculator
Calculate future-value annuity factors for end- or beginning-of-period payments of $1.
Future Value of $1 Table (FVIF) Calculator
Calculate future-value interest factors and create a period-by-period FVIF table.
Future Value of Cash Flows Calculator
Compound a series of dated-by-period cash flows to a common future period.
GDP Calculator
Calculate Gross Domestic Product using the expenditure approach (C + I + G + NX).
Home Equity Line of Credit (HELOC) Calculator
Estimate interest-only draw payments, repayment-period payments, fees, and an LTV-based HELOC limit.
Home Equity Loan Calculator
Estimate a fixed home equity loan payment, borrowing costs, amortization, and an LTV-based borrowing limit.
House Affordability Calculator
Estimate a home price from income, debts, down payment, rate, and housing costs.
How Much Car Can I Afford Calculator
Estimate an affordable vehicle price from a monthly payment budget, financing terms, down payment, trade-in, taxes, and fees.
How Much of a Loan Can I Afford Calculator
Calculate the maximum loan principal supported by a payment budget, rate, term, and financed fees.
Income Tax Calculator
Estimate 2026 U.S. federal income tax using the standard deduction and progressive brackets.
Inflation Calculator
Estimate future cost, purchasing power, and cumulative inflation.
Interest Calculator
Project compound growth with a nominal annual rate, selected compounding frequency, and end-of-month contributions.
Interest Only Mortgage Calculator
Estimate payments and total interest for a mortgage with an initial interest-only period followed by amortizing payments.
Interest Rate Calculator
Calculate the required annual interest rate to earn a specific amount of interest.
Interest Rate on Table Creator
Create compound-interest factor tables across a range of periodic interest rates for a selected number of periods.
Investment Calculator
Project the growth of your investments over time with compound interest.
IRR Calculator
Calculate the Internal Rate of Return (IRR) for a series of annual cash flows.
Layaway Plan Calculator
Calculate the financed layaway balance, periodic payment, fees, taxes, and total purchase cost.
Lease Calculator
Calculate monthly lease payments for equipment or property given a residual value.
Liquidity Ratios Calculator
Calculate current, quick, cash, working-capital, and operating-cash-flow liquidity measures.
List Price Markdown Calculator
Find the list price needed to offer a planned markdown while preserving a target gross margin.
Loan Calculator
Calculate payment, interest, total cost, and the effect of an optional extra payment.
Loan Payment Table Generator
Generate a comparison grid of periodic payments across multiple interest rates and loan terms.
Marriage Tax Calculator
Compare a simplified 2026 federal estimate for two single filers with married filing jointly.
Money Calculator
Count U.S. bills and coins and calculate the total cash amount.
Money Change Calculator
Calculate change due and break it into common U.S. bills and coins using the fewest pieces.
Money Math Calculator
Add, subtract, multiply, or divide monetary amounts using exact cent arithmetic where applicable.
Mortgage Amortization Calculator
View the complete amortization schedule for your mortgage.
Mortgage Calculator
Estimate principal, interest, taxes, insurance, optional HOA fees, and extra payments.
Mortgage Calculator UK
Calculate monthly mortgage payments for UK properties, including Loan-to-Value (LTV).
Mortgage Payoff Calculator
See how much time and interest you can save by making extra payments on your mortgage.
Mutual Fund Calculator
Project a mutual fund balance and net return after contributions, sales loads, deferred charges, and operating expenses.
Net Present Value Calculator
Discount a sequence of periodic cash flows, calculate NPV, profitability index, and an estimated internal rate of return.
Net Worth Calculator
Calculate your total net worth by subtracting liabilities from assets.
Nominal Interest Rate Calculator
Convert an effective annual interest rate to an equivalent nominal annual rate for a selected compounding frequency.
Operations Ratios Calculator
Calculate operating-efficiency ratios for assets, inventory, receivables, payables, and working capital.
Payback Period Calculator
Calculate the time required to recoup an initial investment.
Payment Calculator
Calculate your monthly loan payments and total interest for any type of loan.
Pension Calculator
Estimate your defined benefit pension payout based on years of service and salary.
Percent Off Calculator
Calculate the final price after applying one or more percentage discounts.
Periodic Interest Rate Calculator
Calculate the periodic rate from a nominal annual rate or from an effective annual rate.
Personal Loan Calculator
Calculate monthly payments and total interest for a personal loan, including origination fees.
Present Value Calculator
Find the current value of a future amount at a chosen discount rate.
Present Value of $1 Annuity Table (PVIFA) Calculator
Calculate present-value annuity factors for end- or beginning-of-period payments of $1.
Present Value of $1 Table (PVIF) Calculator
Calculate present-value interest factors and create a period-by-period PVIF table.
Present Value of Annuity Calculator
Calculate the present value of level, growing, or perpetual periodic payments.
Present Value of Cash Flows Calculator
Discount periodic cash flows to period zero and show each present-value contribution.
Price Calculator
Calculate selling price, gross profit, and markup from cost and a target gross margin.
Profit Goal Calculator
Calculate unit sales and revenue required to cover fixed costs and reach a target operating profit.
Profit Margin Calculator
Find gross profit, margin, markup, and optional profit per unit.
Profitability Ratios Calculator
Calculate gross, operating, and net margins plus return on assets, equity, and capital employed.
Property Depreciation Calculator: Real Estate
Create a straight-line, mid-month-convention depreciation schedule for U.S. residential rental or nonresidential real property.
Property Tax Calculator
Estimate annual and periodic property tax from assessed value, exemptions, and either a percent rate or millage rate.
Real Estate Calculator
Analyze a rental property investment. Calculate Cash Flow, Cap Rate, and Cash-on-Cash Return.
Refinance Calculator
Determine if refinancing your mortgage or loan makes financial sense.
Rent Calculator
Determine how much rent you can afford based on your annual income.
Rent vs. Buy Calculator
Compare the financial impact of buying a home versus renting over a specific period.
Rental Property Calculator
Analyze the profitability of a rental property including Net Operating Income (NOI) and Cash Flow.
Repayment Calculator
Calculate loan repayment schedules and see how much time and interest you can save by making extra monthly payments.
Retirement Calculator
Project retirement savings and compare them with an optional income target.
Reverse Sales Tax Calculator
Calculate the pre-tax price and tax amount when the total price including sales tax is known.
RMD Calculator
Estimate a required minimum distribution using the IRS Uniform Lifetime Table.
ROI Calculator
Calculate profit, total return, return multiple, and optional annualized return.
Roth IRA Calculator
Project the growth of your Roth IRA and see how much tax-free income you could have in retirement.
Rule of 72 Calculator
Estimate doubling time and compare it with the exact compound-growth result.
Salary Calculator
Convert your salary between hourly, daily, weekly, monthly, and annual amounts.
Sales Tax Calculator
Calculate subtotal, sales tax, and total for one or more items.
Savings Calculator
Estimate savings growth and check an optional savings goal.
Selling Price Calculator
Calculate the marketplace selling price required for a target dollar profit, profit margin, or markup after fees and costs.
Simple Interest Calculator
Calculate non-compounding interest, total value, and annual interest.
Social Security Calculator
Estimate a 2026 retirement benefit from average indexed annual earnings and claiming age.
Stock Ratios Calculator
Calculate per-share valuation, profitability, book-value, sales, and dividend ratios for a stock.
Student Loan Calculator
Calculate monthly payments for student loans, including the impact of interest capitalization during deferment periods.
Sum of Years Digits Depreciation Calculator
Calculate accelerated depreciation using the sum-of-the-years-digits method and create a full schedule.
Take-Home Paycheck Calculator
Estimate your net pay after federal, state, and FICA taxes.
Traditional IRA Calculator
Calculate the growth of your Traditional IRA and estimate your after-tax retirement savings.
Units of Production Depreciation Calculator
Calculate depreciation per unit and depreciation for a production period, with a lifetime-usage schedule summary.
VA Mortgage Calculator
Calculate VA loan payments including the VA Funding Fee. VA loans typically require no down payment and no PMI.
Variable Declining Balance Depreciation Calculator
Calculate declining-balance depreciation with an optional switch to straight line when that produces more depreciation.
VAT Calculator
Add VAT to a net amount or remove VAT from a gross amount.
Health & Fitness
Body measures, nutrition, training, pregnancy, and wellness estimates.
Army Body Fat Calculator
Check the current U.S. Army waist-to-height standard and optionally calculate the legacy 2023 one-site body-fat estimate.
BAC Calculator
Estimate blood alcohol concentration from detailed beer, wine, spirit, and custom beverage amounts using a Widmark-style model.
Bench Press Calculator
Estimate your Bench Press 1RM and generate a pyramid training routine.
BMI Calculator
Calculate BMI, BMI Prime, ponderal index, adult category, and the corresponding healthy-weight range in metric or imperial units.
BMR Calculator
Estimate basal metabolic rate with Mifflin–St Jeor, revised Harris–Benedict, or Katch–McArdle and view activity-adjusted daily energy needs.
Body Fat Calculator
Estimate body-fat percentage with the U.S. Navy circumference method and compare it with a BMI-based estimate.
Body Surface Area Calculator
Calculate body surface area with Mosteller, Du Bois, Haycock, Gehan–George, Boyd, and Schlich formulas.
Body Type Calculator
Classify seven female fashion-industry body-shape categories from bust, waist, high-hip, and hip measurements and calculate waist-to-hip ratio.
Calorie Calculator
Estimate BMR, total daily energy expenditure, a goal-adjusted calorie target, and a seven-day calorie-cycling schedule.
Calorie Needs Calculator
Estimate daily maintenance calories and apply an optional daily adjustment.
Calories Burned Calculator
Estimate activity calories from body weight, duration, and metabolic equivalent (MET), with a time-projection table.
Carbohydrate Calculator
Estimate daily calorie needs and convert a selected carbohydrate share into grams, with a 45–65% reference interval and 130-gram adult comparison.
Conception Calculator
Plan estimated fertile windows, highest-probability days, and possible due dates across upcoming menstrual cycles.
Due Date Calculator
Estimate a pregnancy due date from the last menstrual period, conception, ultrasound dating, or IVF embryo transfer.
Earned Run Average (ERA) Calculator
Calculate baseball earned run average from earned runs and innings pitched.
Fat Intake Calculator
Estimate daily fat grams from total energy needs, show a 20–35% reference interval, and calculate a less-than-10% saturated-fat comparison.
Gestation Calculator
Estimate an animal due date or breeding date from a typical gestation period.
GFR Calculator
Estimate race-free kidney filtration with the 2021 CKD-EPI creatinine equation for adults or the CKiD U25 creatinine equation for ages 1–25.
Healthy Weight Calculator
Calculate the adult weight interval corresponding to BMI 18.5 through 24.9 and compare adjacent BMI categories.
Ideal Weight Calculator
Compare the Robinson, Miller, Devine, and Hamwi ideal-body-weight formulas and the healthy BMI weight range.
Lean Body Mass Calculator
Estimate lean body mass with Boer, James, and Hume adult equations or the Peters pediatric equation.
Low BMI Screening Calculator
Calculate adult BMI and show low-BMI screening ranges without diagnosing an eating disorder.
Macro Calculator
Estimate a goal-adjusted calorie target and translate a balanced, high-protein, lower-carb, very-low-carb, or custom split into daily grams.
One Rep Max Calculator
Estimate one-repetition maximum with seven established formulas or their average and generate a percentage-based training table.
Overweight Calculator
Calculate how much weight you need to lose to reach a normal BMI range.
Ovulation Calculator
Estimate ovulation dates and fertile windows for multiple cycles from the last period, average cycle length, and luteal phase.
Pace Calculator
Calculate pace, elapsed time, or distance and generate cumulative split estimates in kilometers, miles, meters, or yards.
Period Calculator
Forecast period start and end dates, estimated ovulation, and fertile windows for multiple cycles.
Pregnancy Calculator
Estimate due date, conception date, gestational age, trimester, term window, and pregnancy milestones from five dating methods.
Pregnancy Conception Calculator
Back-calculate an estimated conception date and possible intercourse window from a due date, LMP, ultrasound, conception record, or IVF transfer.
Pregnancy Weight Gain Calculator
Compare current pregnancy weight gain with BMI- and pregnancy-type-based total and week-by-week reference ranges.
Protein Calculator
Estimate a weight-based daily protein range for general adult, older-adult, endurance, strength, calorie-deficit, or pregnancy contexts.
Sleep Calculator
Calculate the best bedtimes to wake up feeling refreshed.
Target Heart Rate Calculator
Estimate maximum heart rate and five training zones with percentage-of-maximum or Karvonen heart-rate-reserve calculations.
TDEE Calculator
Estimate basal metabolic rate and total daily energy expenditure with multiple BMR equations and six activity levels.
Water Intake Calculator
Calculate your recommended daily water intake based on weight and activity level.
Weight Watcher Points Calculator
Calculate an unofficial nutrient-based points estimate for educational comparison.
WHIP Calculator
Calculate baseball walks plus hits per inning pitched.
Wilks Calculator
Calculate your Wilks Score to compare strength across different body weights.
Math & Statistics
Arithmetic, algebra, geometry, probability, and statistics.
Adding Machine Calculator
Add a signed list of amounts and show a running total like a tape calculator.
Algebra Word Problems: Age Calculator
Solve two present ages from their sum and age difference, then project them to another year.
Algebra Word Problems: Coins Calculator
Solve how many coins of two denominations make a known coin count and total value.
Annulus Calculator
Calculate the area and boundary lengths of a ring between two concentric circles.
Area Calculator
Calculate area for rectangles, triangles, trapezoids, circles, sectors, ellipses, and parallelograms.
Average Calculator
Calculate count, sum, arithmetic mean, minimum, and maximum.
Basic Calculator
A simple standard calculator for everyday arithmetic.
Big Number Calculator
Perform arithmetic on very large integers.
Binary Calculator
Convert between Binary and Decimal number systems.
Circle Calculator
Provide a radius, diameter, circumference, or area to calculate every main circle measurement.
Circular Permutation Calculator
Count arrangements of distinct objects around a circle when rotations are considered identical.
Common Factor Calculator
Find all common factors of multiple numbers.
Completing the Square Calculator
Rewrite a quadratic in vertex form and calculate its vertex and roots.
Complex Fraction Calculator
Divide one fraction by another and reduce the result to lowest terms.
Confidence Interval Calculator
Calculate a two-sided normal confidence interval and margin of error for a population mean.
Cubic Equation Calculator - 3rd Order Polynomial
Solve a cubic polynomial ax³ + bx² + cx + d = 0 for all real or complex roots.
Decimal to Fraction Calculator
Convert a terminating or repeating decimal approximation to a reduced fraction.
Decimal to Percent Calculator
Convert a decimal number to a percentage.
Diamond Problem Solver
Find two numbers whose product and sum match a diamond problem.
Difference of Two Squares Calculator
Evaluate and factor a² − b².
Distance Calculator
Calculate distance in 2D, 3D, or between two latitude/longitude coordinates on Earth.
Dot Product Calculator
Calculate the dot product, vector magnitudes, and angle between two numeric vectors.
Estimating Sums and Differences of Fractions Calculator
Estimate a fraction sum or difference using benchmark fractions, and compare it with the exact result.
Even Permutations Calculator
Count the even permutations of a set of distinct elements.
Expanded Form Calculator
Write an integer or decimal as a sum of place-value terms.
Exponent Calculator
Calculate the value of a base raised to the power of an exponent.
Factor Calculator
Find all factors and factor pairs of a number.
Factorial Calculator
Calculate the factorial of a non-negative integer (n!).
Five Number Summary Calculator
Calculate the minimum, first quartile, median, third quartile, maximum, and interquartile range.
FOIL Method Calculator
Expand two linear binomials using the FOIL method.
Fraction Calculator
Perform addition, subtraction, multiplication, and division with fractions.
Fractions Averaging Calculator
Find the exact arithmetic mean of a list of integers, fractions, or mixed numbers.
Fractions Solve for Unknown Calculator
Solve an unknown term in an equivalent-fractions proportion a/b = c/d.
Greatest Common Factor Calculator
Calculate the Greatest Common Factor (GCF/GCD) of two or more numbers.
Half-Life Calculator
Calculate radioactive decay, half-life, or remaining quantity.
Hex Calculator
Convert between Hexadecimal, Decimal, and Binary values instantly.
Improper Fractions to Mixed Numbers Calculator
Convert an improper fraction to a reduced mixed number.
Inverse Trigonometric Functions Calculator
Calculate arcsine, arccosine, or arctangent in degrees and radians.
Lattice Multiplication Calculator
Multiply nonnegative integers and show digit-by-digit partial products used by a lattice method.
LCD Calculator - Least Common Denominator
Find the least common denominator for two or more fractions or denominators.
Least Common Multiple Calculator
Calculate the Least Common Multiple (LCM) of two or more numbers.
Logarithm Calculator
Calculate the logarithm of a number with any base.
Long Addition Calculator
Add a list of whole integers exactly and show a running total.
Long Division Calculator
Calculate quotient and remainder for division problems.
Long Multiplication Calculator
Multiply whole integers exactly and display place-value partial products.
Long Subtraction Calculator
Subtract one whole integer from another exactly.
Math Equation Solver
Solve a linear equation ax + b = c or a quadratic equation ax² + bx + c = 0.
Math Word Problems: Addition & Multiplication Calculator
Model a common groups-times-items-plus-extra word problem.
Math Word Problems: Division Calculator
Solve equal-sharing and equal-grouping division word problems.
Matrix Calculator
Perform addition, subtraction, and multiplication on 2x2 and 3x3 matrices.
Mean, Median, Mode, Range Calculator
Calculate mean, median, mode, range, minimum, maximum, sum, and a sorted data table.
Mixed Number to Decimal Calculator
Convert a mixed number to a decimal and improper fraction.
Mixed Number to Percent Calculator
Convert a mixed number to a decimal percentage.
Mixed Numbers Calculator
Add, subtract, multiply, or divide two mixed numbers with an exact reduced result.
Mixed Numbers to Improper Fractions Calculator
Convert a mixed number to a reduced improper fraction.
Multifactorial Calculator n! to n!!!!!
Calculate n-factorials with step sizes from one through five using exact integer arithmetic.
Number Sequence Calculator
Find terms, partial sums, and a preview for arithmetic, geometric, or Fibonacci sequences.
Odd Permutations Calculator
Count the odd permutations of a set of distinct elements.
Odds Calculator
Convert probability to odds for and against, or convert entered odds to probability.
Ordering Fractions Calculator
Sort a list of integers, fractions, decimals, or mixed numbers from least to greatest or greatest to least.
P-value Calculator
Calculate P-values from Z-scores (Normal Distribution).
Percent Error Calculator
Compare an observed value with an exact or accepted value.
Percentage Calculator
Solve five common percentage problems without changing pages.
Percentage Change Word Problems Calculator
Calculate percentage increase or decrease and show the change relationship.
Percentage Difference Calculator
Measure the absolute difference between two values relative to their average magnitude.
Percentile Calculator
Calculate a requested percentile using linear interpolation and display a percentile table.
Permutation and Combination Calculator
Calculate exact permutations and combinations with or without replacement.
Permutation Calculator
Calculate Permutations (nPr) and Combinations (nCr).
Place Value Calculator
Identify each digit’s place name and value in an integer or decimal.
Prime Factorization Calculator
Break a positive integer into prime factors and identify prime numbers.
Probability Calculator
Calculate independent-event relationships, repeated-event probabilities, normal-distribution areas, or binomial probabilities.
Pyramid Frustum Calculator
Calculate volume and surface area for a square-pyramid frustum.
Pythagorean Theorem Calculator
Provide any two sides of a right triangle to solve the third side, area, perimeter, and squared terms.
Quadratic Formula Calculator
Find real or complex roots, discriminant, vertex, and axis of symmetry.
Quartile Calculator
Calculate quartiles, the interquartile range, fences, and five-number summary.
Random Number Generator
Generate reproducible whole numbers from an inclusive range using a saved seed.
Ratio Calculator
Simplify an integer ratio and optionally scale it from a new first value.
Regular Polygon Calculator
Calculate perimeter, area, apothem, circumradius, and angles from side count and side length.
Rhombus Calculator
Calculate rhombus area and perimeter from diagonals or from side and height.
Right Triangle Calculator
Solve a right triangle from two known values and calculate all sides, acute angles, altitude, area, and perimeter.
Root Calculator
Calculate the nth root of a number.
Round to Nearest Multiple Calculator
Round a number to the nearest, lower, or upper multiple of another number.
Rounding Calculator
Round numbers to specific decimal places using various methods.
Sample Size Calculator
Calculate a required survey sample size or the margin of error for a proportion, including finite-population correction.
Scientific Calculator
Perform complex mathematical operations including trigonometry, logarithms, and exponents.
Scientific Notation Calculator
Convert numbers between standard decimal and scientific notation.
Significant Figures Calculator
Perform arithmetic and round the result using significant-figure rules.
Significant Figures Counter Calculator
Count significant figures and identify decimal-place precision in a written number.
Significant Figures Rounding Calculator
Round a number to a selected number of significant figures.
Simplify Radical Expressions Calculator
Extract perfect powers from a nonnegative integer radical.
Simplifying Complex Fractions Calculator
Simplify a complex fraction whose numerator and denominator each contain a sum or difference of two fractions.
Slope Calculator
Calculate line slope from two points, or project a second point from a starting point, distance, and slope or angle.
Stadium Calculator
Calculate area and perimeter of a stadium shape: a rectangle capped by two semicircles.
Standard Deviation Calculator
Calculate population or sample standard deviation, variance, mean, sum, standard error, and margin of error.
Statistics Calculator
Calculate comprehensive descriptive statistics for a numeric data set.
Surface Area Calculator
Calculate total and component surface areas for nine common three-dimensional shapes.
Triangle Calculator
Solve a general triangle from three known values, including at least one side, and calculate sides, angles, area, radii, and medians.
Triangular Prism Calculator
Calculate volume and surface area of a triangular prism from triangle sides, triangle height, and prism length.
Volume Calculator
Calculate volume and related surface measurements for eleven common three-dimensional shapes.
Z-score Calculator
Calculate a z-score, convert between z and normal probability, or find probability between two z-scores.
Developer
Data, networking, encodings, identifiers, QR codes, and developer utilities.
Bandwidth Calculator
Calculate download/upload time.
Base64 Converter
Encode and decode Base64 strings.
Braille Translator
Translate text to Braille symbols.
Color Converter
Convert colors between HEX, RGB, and HSL formats.
IP Subnet Calculator
Professional tool to calculate network range, broadcast address, and usable host capacity.
JSON Formatter
Format and validate JSON data.
Lorem Ipsum Generator
Generate placeholder text for your designs.
Morse Code Translator
Convert standard text into Morse code signals for communication or learning.
Password Generator
Generate a cryptographically secure password locally; bookmarkable URLs save settings, not the password.
QR Code Generator
Create instant QR codes for website URLs, plain text, or contact information.
UUID Generator
Generate cryptographically secure version 4 UUIDs locally; bookmarkable URLs save the quantity, not generated UUIDs.
Date & Time
Dates, ages, durations, work hours, calendars, and time tools.
Age Calculator
Find exact age, total days, and the next birthday from two dates.
Date Calculator
Calculate duration between dates or add/subtract days from a starting point.
Date Difference Calculator
Find the exact calendar difference and total days between two dates.
Day Counter
Quickly calculate the exact number of days between two specific dates.
Day of Week Calculator
Find the weekday, day of year, ISO week number, and leap-year status.
Decimal to Time Calculator
Convert decimal hours to days, hours, minutes, and seconds.
Hours to Days Converter
Convert hours to decimal days and days plus remaining hours.
Hours to Minutes Converter
Convert hours to minutes.
Hours Worked Calculator
Quickly calculate total shift duration minus break time for payroll or time tracking.
Leap Year Checker
Quickly determine if a specific year is a leap year according to the Gregorian calendar.
Military Time Converter
Convert between 24-hour military time and 12-hour time with AM or PM.
Milliseconds Converter
Quickly convert milliseconds into standard time units like seconds and minutes.
Minutes Converter
Easily convert minutes into hours or seconds for scheduling and timing.
Moon Phase
Visualize and track the current phase of the moon for any given date.
Seconds Converter
Convert seconds to minutes and hours.
Sunrise Sunset Times Calculator
Estimate sunrise, sunset, solar noon, and day length from date, latitude, longitude, and UTC offset.
Time and Date Difference Calculator
Calculate signed elapsed time between two dates and clock times.
Time Arithmetic
Quickly add or subtract time values using a 24-hour clock format.
Time Conversion Calculator
Convert time intervals between subsecond, second, minute, hour, day, week, month, and year units.
Time Duration Calculator
Calculate elapsed time between two clock times, including an optional next day.
Weekly Time Card
Track your weekly work hours, breaks, and estimated earnings accurately.
Work Hours Calculator
Calculate daily billable hours and total pay for a shift.
World Time Converter
Quickly convert your local time to any major global time zone.
Home & Construction
Materials, dimensions, heating, roofing, flooring, and building estimates.
BTU Calculator
Estimate BTU requirement for heating or cooling a room.
Concrete Calculator
Estimate concrete quantities, explicit waste, supplier bag yields and optional material/labor cost.
Gravel Calculator
Estimate the amount of gravel needed for your driveway, path, or landscaping project.
Mulch Calculator
Estimate the volume of mulch or soil needed for your garden beds and landscaping projects.
Paint Calculator
Estimate paint quantity from wall area, openings, coats, coverage, and waste allowance.
Roofing Material
Estimate the required amount of roofing 'squares' and shingle bundles based on footprint area and roof pitch.
Square Footage Calculator
Calculate area for repeated rectangular spaces in square feet, yards, and acres.
Stair Calculator
Determine the riser height, number of steps, and total run for a stair stringer.
Tile Calculator
Determine the number of tiles needed for your flooring project, including a waste factor.
Science & Engineering
Physics, electricity, chemistry, weather, and engineering formulas.
Acceleration Calculator
Calculate acceleration from change in velocity over time.
Density Calculator
Calculate density in kilograms per cubic meter and grams per cubic centimeter.
Dew Point Calculator
Calculate the dew point temperature from current air temperature and relative humidity.
Displacement as a Function of Average Velocity and Time Calculator
Solve displacement, average velocity, or time from s = v̄t.
Displacement as a Function of Velocity and Time Calculator
Calculate displacement from initial velocity, final velocity, and elapsed time.
Displacement as a Function of Velocity, Acceleration and Time Calculator
Calculate displacement from initial velocity, constant acceleration, and time.
E = mc² Calculator
Convert mass to rest energy with Einstein’s mass-energy equivalence.
Elastic Potential Energy Calculator
Calculate energy stored in a stretched or compressed ideal spring.
Electricity Cost
Estimate the electricity cost of running appliances based on their wattage and usage time.
Electricity Cost Calculator
Estimate energy use and electricity cost for one or more devices.
Engine Horsepower
Estimate peak engine horsepower based on displacement, RPM, and volumetric efficiency.
Force Calculator
Calculate net force, mass, or acceleration from Newton’s second law.
Friction Calculator
Calculate friction force from a coefficient of friction and normal force or mass.
Gravitational Potential Energy Calculator
Calculate gravitational potential energy near a planet’s surface.
Heat Index
Calculate the 'feels like' temperature by combining air temperature and relative humidity.
Hooke's Law Calculator
Solve spring force, spring constant, or displacement using Hooke’s law.
Horsepower Calculator
Determine an engine's mechanical horsepower by providing its torque output and rotational speed (RPM).
Ideal Gas Law Calculator
Solve pressure, volume, amount, or absolute temperature for an ideal gas in SI units.
Impulse Calculator
Calculate impulse, average force, or contact time from J = FΔt.
Impulse-Momentum Calculator
Calculate impulse and momentum change from mass and initial/final velocity.
Kinetic Energy Calculator
Calculate translational kinetic energy, mass, or speed.
Mass Calculator
Calculate the total mass of an object based on its density and volume.
Molarity Calculator
Calculate the molar concentration of a solute in a solution by mass, volume, and molar mass.
Molecular Weight
Calculate molar mass from a neutral molecular formula, including nested groups and hydrate notation.
Momentum Calculator p = mv
Calculate linear momentum, mass, or velocity.
Ohm's Law Calculator
Calculate voltage, current, resistance, and power from a selected known pair.
Pressure Calculator
Calculate pressure, force, or area using P = F/A.
Resistor Color Code
Decode the resistance value and tolerance of axial resistors using the standard electronic color code system.
Speed Calculator
Calculate average speed and pace from distance and elapsed time.
Uniformly Accelerated Motion Calculator
Solve one constant-acceleration motion variable from standard one-dimensional kinematic equations.
Velocity as a Function of Acceleration and Time Calculator
Calculate final velocity from initial velocity, acceleration, and elapsed time.
Velocity Calculator
Calculate average velocity based on displacement and time.
Voltage Drop Calculator
Calculate voltage drop in a wire run (Single Phase).
Wavelength Calculator
Calculate wavelength, wave speed, or frequency.
Weight Calculator (Physics)
Calculate weight force, mass, or gravitational acceleration.
Weight on Planets
Calculate your weight on different celestial bodies in our solar system.
Wind Chill Calculator
Calculate the perceived temperature due to wind cooling effect.
Work Calculator (Physics)
Calculate mechanical work from force, displacement, and the angle between them.
Conversions & Sizes
Units, clothing, image, paper, sports equipment, and size conversions.
Acceleration Conversion Calculator
Convert acceleration between SI, imperial, Gal, and standard-gravity units.
Angle Conversion Calculator
Convert angles among degrees, radians, gradians, turns, arcminutes, and arcseconds.
Aspect Ratio Calculator
Calculate aspect ratios and resize dimensions.
Aspect Ratio Calculator
Calculate aspect ratios and resize dimensions.
Belt Size Calculator
Calculate belt size from waist size.
Bike Frame Size Calculator
Calculate bike frame size based on inseam.
Bra Size Calculator
Estimate bra size based on band and bust measurements.
Camera Lens Equivalent
Calculate 35mm equivalent focal length for different sensor sizes.
Celsius to Rankine Calculator
Convert temperatures from degrees Celsius to degrees Rankine.
Child Height Predictor
Estimate a child's adult height based on the mid-parental height method.
Clothing Size Converter
Convert clothing sizes between international regions (Men's Tops).
Computer Storage Units Conversion Calculator
Convert bits and bytes using decimal SI or binary IEC storage units.
Conversion Calculator
Convert between different units for length, weight, and temperature.
Cooking Conversion Calculator
Convert common cooking volume and weight units, including optional volume-to-weight conversion by density.
Cubic Feet to Cubic Yards Calculator
Convert cubic feet to cubic yards.
Cubic Yards to Cubic Feet Calculator
Convert cubic yards to cubic feet.
Decimal Degrees to Degrees Minutes Seconds Calculator
Convert a decimal angle or coordinate to degrees, minutes, and seconds.
Energy Conversion Calculator
Convert energy between joules, watt-hours, calories, BTU, foot-pounds, and electronvolts.
Fahrenheit to Rankine Calculator
Convert temperatures from degrees Fahrenheit to degrees Rankine.
Feet and Inches Calculator
Add, subtract, multiply, or divide measurements expressed in feet and inches.
Force Conversion Calculator
Convert force between newtons, pound-force, kilogram-force, dynes, and related units.
Glove Size Calculator
Determine your standard glove size based on the circumference of your hand.
Golden Ratio
Calculate dimensions based on the mathematical beauty of the Golden Ratio (φ ≈ 1.618).
Hat Size Calculator
Calculate your standard US hat size from your head circumference.
Jacket Size Calculator
Find your standard jacket size based on your chest circumference measurement.
Kelvin to Rankine Calculator
Convert temperatures from kelvin to degrees Rankine.
Momentum Unit Converter
Convert linear momentum and impulse-equivalent units.
Paper Size Quick Reference
Find exact millimeter and inch dimensions for international standard paper formats.
Percent to Decimal Calculator
Convert a percentage to decimal form.
Percent to Fraction Calculator
Convert a percentage to a simplified fraction and decimal.
Pixel Density
Calculate the PPI (Pixels Per Inch) and evaluate the sharpness of any display based on resolution and size.
Power Conversion Calculator
Convert power between watts, horsepower, BTU per hour, and foot-pounds per second.
Pressure Conversion Calculator
Convert pressure between pascals, bar, atmospheres, psi, torr, and millimeters of mercury.
Ring Size Finder
Convert physical ring diameter measurements into standard US Ring Sizes for accurate jewelry shopping.
Roman Numerals
Seamlessly convert between standard Arabic numerals and classical Roman numeral notations.
Shoe Size Converter
Convert shoe sizes between US, UK, and EU standards.
Skateboard Size Calculator
Calculate recommended deck width based on your shoe size.
Ski Size Calculator
Calculate recommended ski length based on height and skill level.
Snowboard Size Calculator
Calculate target snowboard length based on your measurements.
Speed Conversion Calculator
Convert speed between metric, imperial, nautical, and Mach units.
Square Feet to Square Meters Calculator
Convert area from square feet to square meters.
Square Meters to Square Feet Calculator
Convert area from square meters to square feet.
Surfboard Volume Calculator
Calculate your ideal surfboard volume based on weight and experience level.
Troy Weight Conversion Calculator
Convert precious-metal weights between grains, pennyweights, troy ounces, troy pounds, grams, and kilograms.
TV Size & Viewing Distance Calculator
Estimate a practical viewing-distance range from TV size and resolution.
Volume Conversion Calculator
Convert liquid and solid volume across metric, US customary, and cubic units.
Wetsuit Size Calculator
Get a recommended wetsuit size based on your height and weight.
Education
Grades, GPA, and study calculations.
Final Grade Calculator
Determine the score you need on your final exam to achieve your target overall grade.
GPA Calculator
Calculate your weighted Grade Point Average based on course credits and grades.
Weighted Grade Calculator
Calculate a course grade from matching lists of assessment scores and weights.
Vehicles & Travel
Fuel, mileage, performance, tires, and trip calculations.
Drag Performance
Estimate your vehicle's 1/4 mile elapsed time (ET) and terminal trap speed based on power-to-weight ratio.
Fuel Cost Calculator
Estimate fuel used and trip cost from distance, efficiency, and fuel price.
Gas Mileage Calculator
Convert a trip into MPG, liters per 100 km, and kilometers per liter.
Mileage Reimbursement
Calculate reimbursement from business miles and an editable per-mile rate, defaulted to the current 2026 U.S. business rate.
Tire Size Calculator
Calculate exact tire dimensions from standard sidewall codes.
Lifestyle
Daily decisions, recreation, media, and personal utilities.
Dice Roller
Roll reproducible virtual dice using a saved seed.
Golf Handicap
Calculate your handicap differential for a single round of golf.
Love Compatibility
Discover your potential compatibility score based on the magic of names.
NFL Draft Pick Value Calculator
Compare packages of NFL draft picks using the traditional draft-pick trade value chart.
Tip Calculator
Calculate gratuity, total bill, and an optional split per person.
Pets
Pet age and ownership cost estimates.
Bird Age Calculator
Convert bird years to human years (Small Birds).
Cat Age Calculator
Convert your cat's age to human years equivalent.
Dog Age Calculator
Convert your dog's age to human years equivalent based on standard development milestones.
Fish Age Calculator
Convert your fish's calendar age to the equivalent human years.
Guinea Pig Age
Convert your guinea pig's calendar age to the equivalent human years.
Hamster Age
Convert your hamster's calendar age to the equivalent human years.
Horse Age Calculator
Convert your horse's calendar age into the equivalent human years for health and development tracking.
Pet Ownership Cost
Estimate the financial commitment of owning a pet, including food, healthcare, and supplies over their lifetime.
Rabbit Age
Convert your rabbit's biological age into equivalent human years to better understand their life stage.
Turtle Age Calculator
Convert your pet turtle's age to human-equivalent maturity years.