Health Calculators
Browse Health calculators.
BMI Calculator
Understand BMI with adult weight categories, metric and imperial formulas, height and weight tables, body composition guidance, and answers to common BMI questions.
BMR Calculator
Estimate resting energy with the Mifflin–St Jeor BMR formula. Understand BMR, RMR, daily calorie needs, activity factors, and common metabolism questions.
Calorie Calculator
Use this free Calorie Calculator to estimate daily calorie needs with clear inputs, instant results, useful supporting data and an explanation of the method.
Healthy Weight Calculator
Calculate a healthy adult weight range for your height using BMI 18.5–24.9. See kilograms, pounds, formula, interpretation and an animated gauge.
Heart Rate Calculator
Convert a pulse count to beats per minute, interpret resting heart rate, and estimate moderate and vigorous exercise zones by age.
Ideal Weight Calculator
Compare Devine, Robinson, Miller and Hamwi ideal-weight formulas. See pounds, kilograms, formula range, average, limitations and examples.
Lean Body Mass Calculator
Estimate lean body mass, fat mass and lean percentage from body weight and body-fat percentage in pounds or kilograms.
Sleep Calculator
Calculate practical bedtimes or wake-up times using adjustable sleep cycles and time to fall asleep, then compare options with age-based sleep guidance.
TDEE Calculator
Estimate total daily energy expenditure with metric or imperial inputs, clear activity levels, an animated energy gauge, and transparent calorie comparisons.
Water Intake Calculator
Use this free Water Intake Calculator to calculate water intake with clear inputs, instant results, useful supporting data and an explanation of the method.
Weight Gain Calculator
Use this free Weight Gain Calculator to calculate weight gain with clear inputs, instant results, useful supporting data and an explanation of the method.
Weight Loss Calculator
Use this free Weight Loss Calculator to calculate weight loss with clear inputs, instant results, useful supporting data and an explanation of the method.