Free, science-based fitness calculators — pick one to get instant results. Each has its own shareable link.
U.S. Navy method using body measurements. Women also enter hip.
Open calculator →Calories your body burns at complete rest (Mifflin–St Jeor).
Open calculator →Total calories you burn per day, including activity.
Open calculator →Maintenance calories plus a safe target for your goal.
Open calculator →Turn a daily calorie goal into protein, carbs and fat.
Open calculator →A quick height-to-weight screen (not a body-composition measure).
Open calculator →The weight range that matches a healthy BMI for your height.
Open calculator →A baseline hydration estimate from your weight and activity.
Open calculator →How much protein supports your goal, based on body weight.
Open calculator →Estimate your max for a lift from a working set (Epley formula).
Open calculator →