Calculator category
Health Calculators
Body composition, proportion, and heart-rate tools.
Explore 4 free, evidence-informed tools with transparent formulas and practical guidance.
All health tools
- Body Fat Percentage Calculator Estimate body-fat percentage with the sex-specific U.S. Navy circumference formula. Use calculator →
- Waist-to-Height Ratio Calculator Calculate adult waist-to-height ratio and interpret central-adiposity screening bands. Use calculator →
- Waist-Hip Ratio Calculator Compare waist-to-hip ratio with sex-specific WHO substantially increased-risk cutoffs. Use calculator →
- Heart Rate Zone Calculator Calculate five personalized Karvonen zones using Tanaka predicted maximum heart rate. Use calculator →