Health and Nutrition Calculators: Macros, Energy Expenditure and Calories
These calculators estimate daily energy needs and how to divide them between protein, carbohydrate and fat from your body measurements and activity level. They use widely published equations and give estimates only; for personal medical or dietary advice speak to a qualified professional.
9 free health & nutrition calculators
Macro Calculator
Split a daily calorie target into protein, carb and fat grams.
Open calculator →Carbohydrate Calculator
Daily carbohydrate target in grams, from calories and carb %.
Open calculator →Protein Calculator
Daily protein target in grams, from body weight and activity level.
Open calculator →Fat Intake Calculator
Daily fat intake target in grams, from calories and fat %.
Open calculator →TDEE Calculator
Total Daily Energy Expenditure — your maintenance calories.
Open calculator →GFR Calculator
Estimated kidney filtration rate (2021 CKD-EPI equation).
Open calculator →Body Type Calculator
Body frame size from your height-to-wrist ratio.
Open calculator →Body Surface Area Calculator
Estimated body surface area (Du Bois formula).
Open calculator →BAC Calculator
Estimated Blood Alcohol Content (Widmark formula).
Open calculator →Frequently asked questions
Can these calculators replace a dietitian?
No. They give general estimates; individual needs vary with health conditions and goals.