Health calculators
made simple

Free online calculators for all your health and fitness math.

TDEE Calculator

Total Daily Energy Expenditure

Calculate the total calories your body burns each day, including activity.

Basal Metabolic Rate

Calculate the calories your body burns at complete rest.

Body Mass Index

Calculate your BMI with context on what it means and where it fits.

Body composition estimate

Estimate your body fat percentage using validated formulas.

Protein, carbs and fats

Split your daily calories into macros for your goal.

Daily water intake

Calculate your daily water needs by weight and activity.

Health calculators built on peer-reviewed formulas — with sources cited and methodology shown on every page.