Free, accurate health & fitness calculators — calories, BMI, macros, body fat and more. Clear answers in seconds, on any device.
Each one is fast, accurate, works in metric or imperial, and runs entirely in your browser.
Daily calories to maintain, lose or gain weight.
Open tool →Your basal metabolic rate and daily burn.
Open tool →Body mass index and healthy weight range.
Open tool →Protein, carbs and fat for your goal.
Open tool →Estimate body fat % with the U.S. Navy method.
Open tool →Your healthy target weight by height.
Open tool →How much water to drink each day.
Open tool →Estimate your baby's due date and week.
Open tool →The number behind every fitness goal — maintain, lose or gain.
Calculate my calories →