Health Calculators (Adults)
General health calculators for adults: BMI, basal metabolic rate, daily calorie needs and estimated body fat. General information only, not medical advice.
These are standard arithmetic formulas (WHO BMI categories, Mifflin-St Jeor, the US Navy circumference method). Their results are population-level estimates that can be far off for any individual — athletes, older adults and many others fall outside what these formulas describe. They are not a diagnosis, an assessment of your health, or a recommendation to gain or lose weight. For anything about your own body, talk to a medical professional.
Your details
BMI: 22.0 · Normal range (18.5 – 24.9)
Nothing you enter is stored or sent anywhere; the calculations run in this browser tab and are gone when you close it.
How to use
- Enter your sex, age (18 or over), height and weight.
- Switch between calculators with the tabs: BMI; BMR and estimated daily energy needs; body fat estimated from circumferences; and the weight range matching a BMI of 18.5–24.9.
- Treat every result as general information only, never as a health assessment.
Notes
Only published standard formulas are used: BMI with WHO categories, the Mifflin-St Jeor equation for BMR, and the US Navy circumference method for body fat. All of them are population-level estimates that can be far off for an individual. This page offers no diagnosis, no health assessment and no recommendation to gain or lose weight. Nothing you enter is stored or sent anywhere, and because the calculators are for adults, results are not shown for ages under 18.
FAQ
- Why can BMI look normal while body fat looks high?
- BMI uses only height and weight and cannot distinguish muscle from fat. The circumference method is also an estimate, and two estimates disagreeing is common.
- Which BMR formula is used?
- The Mifflin-St Jeor equation (1990): for men, 10 × weight (kg) + 6.25 × height (cm) − 5 × age + 5; for women, the same minus 161. Multiplying by an activity factor gives the TDEE estimate.