Macro Calculator

Convert a calorie target into protein, carbohydrate, and fat grams.

Macro Calculator helps you split a calorie target into protein, fat, and carbohydrate grams. Enter calories, protein, carbohydrate, and fat, review the breakdown, and use the guidance below to understand what the number means — and what it does not. What the Macros calculator does Macro Calculator is built for body measurements, calories, and everyday health math. Split a calorie target into protein, fat, and carbohydrate grams. You enter calories, protein, carbohydrate, and fat, then Simple Calculators computes the result instantly. These tools use widely published formulas. They are educational screens, not a diagnosis. How the math works Protein and carbs are 4 kcal/g; fat is 9 kcal/g. Grams = (calories × percent) / kcal per gram. The formula: Grams = calories × percent ÷ calories per gram. Fat uses 9 kcal per gram; protein and carbs use 4.