Fast, accurate health and fitness math — the same formulas trainers and clinicians use, without the app download or the account.
Each one updates instantly as you type. Nothing is sent anywhere.
Body Mass Index from height and weight — the standard screening number used in most clinical settings. Read the full guide to BMI.
Basal metabolic rate (Mifflin–St Jeor equation) plus total daily energy expenditure. Read the calorie deficit guide.
U.S. Navy circumference method — needs a tape measure, no calipers or scan required.
Devine formula — the reference range clinicians commonly use for medication dosing and target-weight discussions.
Baseline daily fluid target from body weight, adjusted for activity. Read the hydration guide.
Turn a daily calorie target into grams of protein, carbs, and fat for three common goals.