Five tools, zero sign-up
Straightforward calculators for BMI, daily calories, body fat, ideal weight, and macros — built on the same formulas clinicians and dietitians actually use.
Quick check
Want unit options and a full breakdown? Open the full BMI calculator →
The tools
Every tool below opens to its own page with the calculator, a plain-language explanation of the formula, and answers to common questions.
Nutrition
Find your daily energy needs based on activity level.
Open tool →Body composition
Estimate body fat percentage with the U.S. Navy method.
Open tool →Body composition
See a healthy weight range for your height and sex.
Open tool →Why these calculators
BMI, Mifflin-St Jeor, the U.S. Navy body fat method, and the Devine ideal-weight formula — the same equations used in clinical and fitness settings.
Every calculator runs in your browser. Nothing you type is stored or sent anywhere.
Each result comes with a short explanation of what the number means and what it doesn't.