Health Calculators
Free health calculators — accurate, fast, and free of clutter.
3 Tools100% FreeNo sign-up
BMI Calculator
Get your Body Mass Index and healthy weight range—plus an honest look at why BMI misreads athletes, older adults, and different ethnicities.
Metric/ImperialBMI categoriesHealthy weight range
Calculate now Calorie Calculator
Estimate your daily calorie needs using BMR and activity level, then learn how to adjust the number based on real-world results.
BMR-based estimateActivity multipliersGoal adjustment
Calculate now BMR Calculator
The calories you burn doing nothing and why two people with the same stats can get numbers 200 calories apart.
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.