Health Calculators
Free health calculators — accurate, fast, and free of clutter.
3 Tools100% FreeNo sign-up
BMI Calculator
Find your Body Mass Index and healthy weight range for your height in kg, lb, cm or feet, and learn when BMI can be misleading.
Metric/ImperialBMI categoriesHealthy weight range
Calculate now Calorie Calculator
Estimate how many calories you need a day to lose, maintain or gain weight, using the Mifflin-St Jeor formula and your activity level.
BMR-based estimateActivity multipliersGoal adjustment
Calculate now BMR Calculator
Calculate your basal metabolic rate with Mifflin-St Jeor, Harris-Benedict and Katch-McArdle, and see why the three results differ.
Three formulasActivity multipliersFormula comparison
Calculate now About health calculators
Each of these uses a verified, standard formula for its category — nothing invented, nothing rounded further than the underlying math requires.
Accurate results
Every calculator uses published, checkable formulas.
Easy to use
A simple interface with results as you type.
Free forever
No registration, no hidden fees.