Free Online Health Calculators
Check a BMI, plan calories, estimate body fat, or find your resting burn. These are screening estimates, not medical advice.
- BMI Calculator Body mass index, category and healthy range. Get started
- Calorie Calculator Daily target for your goal, plus macros. Get started
- Body Fat Calculator Tape-measure estimate with the Navy method. Get started
- BMR Calculator Resting burn plus every activity level. Get started
Which health calculator to use
BMI Calculator scores weight against height with a category and healthy range. Body Fat Calculator goes further with the U.S. Navy tape-measure method: waist, neck, height (plus hips).
BMR Calculator estimates resting burn with Mifflin-St Jeor and shows every activity level. Calorie Calculator turns that into a daily target for loss, maintenance, or gain, with protein, fat, and carb splits.
These tools estimate from population formulas. They do not diagnose, and muscle, pregnancy, age, and illness all shift what a number means - treat results as a starting point for a clinician conversation.