Health and fitness
These health and fitness tools present formula-based estimates, not diagnoses or individualized treatment plans. The collection separates body measurements, nutrition, training, pregnancy timing and clinical relationships so that the purpose of a result is clear before you enter personal values. A reference interval can describe a population without identifying the right target for a particular person. Measurement method, age, life stage and the assumptions of the formula all matter.
Start with these tools
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.
Read each tool’s limitations and confirm the units before using an estimate. Pregnancy dates are approximate and do not establish an exact conception day. Body-size screening measures do not capture every aspect of health or body composition. Nutrition examples illustrate an equation rather than prescribing an intake. A qualified clinician can interpret a result alongside information that a browser tool does not have. Calculations run locally, but shared URLs, downloaded reports and browser history can contain the values you enter. Use the available privacy controls, avoid sending sensitive input sets to other people unintentionally, and seek professional guidance for decisions about your care.
body
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.
BMI Calculator
Calculate BMI, BMI Prime, ponderal index, adult category, and the corresponding healthy-weight range in metric or imperial units.
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.
Adult BMI Reference Weight Interval by Height
Translate the stated adult BMI reference boundaries into weights for an entered height.
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.
Compare a Weight with an Adult BMI Reference
Show the arithmetic difference from the tool’s stated adult BMI reference, without prescribing weight change.
Sleep Calculator
Calculate the best bedtimes to wake up feeling refreshed.
clinical
training
Bench Press Calculator
Estimate your Bench Press 1RM and generate a pyramid training routine.
One Rep Max Calculator
Estimate one-repetition maximum with seven established formulas or their average and generate a percentage-based training table.
Pace Calculator
Calculate pace, elapsed time, or distance and generate cumulative split estimates in kilometers, miles, meters, or yards.
Target Heart Rate Calculator
Estimate maximum heart rate and five training zones with percentage-of-maximum or Karvonen heart-rate-reserve calculations.
Wilks Calculator
Calculate your Wilks Score to compare strength across different body weights.
nutrition
BMR Calculator
Estimate basal metabolic rate with Mifflin–St Jeor, revised Harris–Benedict, or Katch–McArdle and view activity-adjusted daily energy needs.
Calorie Calculator
Estimate BMR, total daily energy expenditure, a goal-adjusted calorie target, and a seven-day calorie-cycling schedule.
Estimate Maintenance Energy Needs
Estimate maintenance energy using the selected Mifflin–St Jeor constant and activity factor, rather than a weight-loss plan.
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.
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.
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.
Protein Calculator
Estimate a weight-based daily protein range for general adult, older-adult, endurance, strength, calorie-deficit, or pregnancy contexts.
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.
pregnancy
Estimate Ovulation Timing from a Period Date
Estimate cycle-based ovulation and a possible conception window from a menstrual period date and stated cycle assumptions.
Due Date Calculator
Estimate a pregnancy due date from the last menstrual period, conception, ultrasound dating, or IVF embryo transfer.
Ovulation Calculator
Estimate ovulation dates and fertile windows for multiple cycles from the last period, average cycle length, and luteal phase.
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.
Estimate Conception Timing from a Due Date
Work backward from an estimated due date to an approximate conception date, with clearly stated dating limits.
Pregnancy Weight Gain Calculator
Compare current pregnancy weight gain with BMI- and pregnancy-type-based total and week-by-week reference ranges.
Frequently asked questions
How do I choose a tool from Health and fitness?
Start with the quantity you need to solve for, then compare the required inputs and assumptions before entering values.
Are results in Health and fitness guaranteed?
No. Read the formula, limitations and reference information on the individual calculator. Entered example rates are not current offers or professional advice.
Can I save a calculation from Health and fitness?
The calculator pages support browser-local project and share controls. Shared links and exported files may contain your inputs.