Health Calculators
Check BMI, body fat or waist ratios, estimate daily calories and macros, or set heart rate zones and running pace. Period, ovulation and due date calculators estimate key dates. Results are estimates, not medical advice.
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20 toolsBMI Calculator
Calculate adult body mass index in metric or US customary units.
Open calculatorBody Fat Calculator
Estimate adult body-fat percentage and fat mass using the Deurenberg BMI, age, and sex equation.
Open calculatorBody Surface Area Calculator
Estimate body surface area with Mosteller and Du Bois formulas and compare both results.
Open calculatorCalorie Calculator
Estimate adult resting energy and daily calorie needs from activity level.
Open calculatorCalories Burned Calculator
Estimate total and above-rest activity calories using duration, body weight, and published MET values.
Open calculatorDue Date Calculator
Estimate a pregnancy due date from a last period, known conception date, ultrasound age, or IVF transfer.
Open calculatorFFMI Calculator
Calculate fat-free mass index from body mass, body-fat percentage, and height.
Open calculatorIdeal Weight Calculator
Compare four historical ideal-body-weight equations from adult height and sex-specific coefficients.
Open calculatorLean Body Mass Calculator
Estimate non-fat body mass using Boer’s height-weight equation or calculate it from a supplied fat percentage.
Open calculatorMacro Calculator
Convert a daily calorie target and a chosen macro split into protein, carbohydrate, and fat grams.
Open calculatorOne Rep Max Calculator
Estimate a one-repetition maximum from a completed set and compare Epley and Brzycki predictions.
Open calculatorOvulation Calculator
Estimate ovulation and a six-day fertile window using the calendar cycle-day convention.
Open calculatorPace Calculator
Convert a recorded distance and duration into pace, speed, and constant-pace race times.
Open calculatorPeriod Calculator
Estimate upcoming period dates from your last start date, average cycle length, and bleeding duration.
Open calculatorPregnancy Weight Gain Calculator
Look up singleton-pregnancy total weight-gain reference ranges using pre-pregnancy BMI and calculate gain so far.
Open calculatorSteps to Distance Calculator
Estimate walking distance from step count and a measured average length per step.
Open calculatorTarget Heart Rate Calculator
Calculate age-estimated maximum heart rate and percentage-based exercise heart-rate ranges.
Open calculatorWaist-to-Height Ratio Calculator
Calculate waist circumference relative to height using measurements in the same unit.
Open calculatorWaist-to-Hip Ratio Calculator
Calculate the ratio between waist and hip circumferences measured with a consistent protocol.
Open calculatorWeight Loss Percentage Calculator
Calculate signed weight loss from starting and current weight, with a comparison goal entered as percentage or weight.
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