Health calculators

BMI Calculator

Calculate BMI from weight and height in US or metric units, see your CDC/WHO category and healthy-weight range, plus an optional Asian-population cutoff.

Calorie Calculator

Find your BMR, maintenance calories (TDEE), and a daily calorie target to lose, maintain, or gain weight, using the Mifflin-St Jeor equation.

Steps to Miles Calculator

Convert steps to miles or kilometers using a stride length estimated from your height and gender, not a flat 2,000-steps-per-mile guess. Also converts a distance back into steps.

Body Surface Area (BSA) Calculator

Calculate body surface area from height and weight using the Mosteller or Du Bois formula, in US or metric units, with both results shown side by side.

FFMI Calculator

Calculate your Fat-Free Mass Index and height-normalized FFMI from weight, height, and body fat percentage, and see how it compares to the documented natural (non-steroid) ceiling of 25.