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.