Free Health & Fitness Calculators
A growing library of accurate, easy-to-use calculators built to help you understand your body and train smarter.
All Calculators
Each tool uses the formulas trusted by clinicians and coaches. No signup, no email — just enter your details and get accurate results.
BMI Calculator
Check your Body Mass Index, healthy weight range, and what your score means for your health.
Calculate BMIBody Fat Calculator
Estimate your body fat percentage using the U.S. Navy, U.S. Army, or BMI-based formulas.
Calculate body fatHeart Rate Zone Calculator
Find your max heart rate and personalized training zones using Tanaka, 220-age, Gulati, or Karvonen.
Calculate zones