Fitness Calculators

Free fitness and health calculators built on published formulas — BMI, calories, BMR, body fat, ideal weight, macros, pace, and heart-rate zones. Everything runs in your browser: no account, and nothing you enter is transmitted or stored. Start with BMI below, or jump to the Calorie Calculator further down the page — every calculator in the directory has its own page with a full guide and FAQ.

BMI Calculator

Body mass index from your height and weight, with the standard WHO adult categories. For how BMI works, its limitations, and the FAQ, see the full BMI Calculator page.

Calculate your BMI

Example: 70 kg at 175 cm → BMI 22.9 (normal weight).

Calorie Calculator

Daily calories to maintain, lose, or gain weight, from the Mifflin-St Jeor equation and your activity level. For how the targets are derived, accuracy notes, and the FAQ, see the full Calorie Calculator page.

Daily calorie targets

Example: male, 70 kg, 175 cm, 25, moderately active → maintenance ≈ 2,594 kcal/day.

Not medical advice: these calculators provide general educational estimates from published population formulas. Consult a qualified healthcare professional before changing diet or exercise. All data is processed locally in your browser and never transmitted.