Energy expenditure and body composition math.
BMR, TDEE, ideal weight, body fat percentage — the metrics that show up in every fitness plan. Tools tagged fitness use Mifflin-St Jeor, Devine, and Jackson-Pollock formulas and run client-side.
Calculate Body Mass Index from height and weight. Shows WHO classification. 100% in-browser.
Estimate Basal Metabolic Rate using the Mifflin-St Jeor equation. Calories you burn at rest.
Estimate Total Daily Energy Expenditure from BMR and activity level. Plus maintenance and calorie-target suggestions.
Compare four published methods — Hamwi, Devine, Robinson, Miller — side by side.
Estimate body fat % using the US Navy (Hodgdon-Beckett) circumference method.