Health Calculators
BMI and health-related calculators for daily use.
Health calculators provide screening estimates for body composition and energy needs: BMI category, basal metabolic rate (BMR), total daily calories (TDEE), body fat percentage via the U.S. Navy method, and ideal weight ranges from established clinical formulas.
These tools use published equations and are meant for general reference — not medical diagnosis. Results vary with muscle mass, age and individual metabolism; consult a healthcare provider before making significant diet or fitness changes.
Start with BMI or ideal weight for a rough category check, then use BMR and the calorie calculator when planning intake. Body-fat estimates need accurate tape measurements — small errors in waist or neck length move the percentage.
Common tasks
- Check BMI category against WHO ranges
- Estimate resting calorie burn before setting a diet target
- Track body fat trends with tape-measure inputs
- Compare ideal weight across Devine, Robinson, Miller and Hamwi formulas
Each tool page below includes a working utility plus a short original guide for that job. How we write those guides is on our editorial standards page.
BMI Calculator
Body Mass Index calculator.
BMR Calculator
Estimate your Basal Metabolic Rate — calories burned at rest.
Calorie Calculator
Find your daily calorie needs (TDEE) for loss, maintenance or gain.
Body Fat Calculator
Estimate body fat percentage using the U.S. Navy method.
Ideal Weight Calculator
Find your ideal healthy weight range using medical formulas.