Free Calculators

Understanding the theory is half of it — run your own numbers and it clicks. Everything runs locally in your browser; nothing is uploaded.

Enter your age, sex, height, weight, and activity to estimate your BMR and daily calorie burn (TDEE) — the starting point for any diet.

Turn your calorie target into daily grams of protein, carbs, and fat for cutting, maintaining, or bulking.

Estimate BMI, body-fat percentage (US Navy method), and lean body mass from a few tape-measure inputs.

Estimate your one-rep max (1RM) from any set, and convert running pace, distance, and time.