All Calculators
Free, science-based health & fitness calculators. Pick a category or search by name.
BMI Calculator
Body Mass Index, category and your healthy weight range.
Calculate now →BMR Calculator
Basal Metabolic Rate via Mifflin-St Jeor and Harris-Benedict.
Calculate now →Body Fat Percentage Calculator
US Navy method with lean body mass and category.
Calculate now →Calorie Calculator
Daily calorie target for loss, maintenance or gain.
Calculate now →Heart Rate Zone Calculator
Max HR and training zones Z1–Z5.
Calculate now →Ideal Weight Calculator
Devine, Robinson and Miller formulas compared.
Calculate now →Macro Calculator
Protein, fat and carb split for your diet style.
Calculate now →One Rep Max Calculator
1RM via Epley, Brzycki and Lombardi.
Calculate now →Running Pace Calculator
Pace, split times and race predictor.
Calculate now →TDEE Calculator
Total Daily Energy Expenditure by activity level.
Calculate now →