Macro Calculator

About this calculator

This tool converts a total daily calorie target into grams of protein, carbohydrates and fat based on the diet style you pick — balanced, high-protein, low-carb, keto and similar splits each assign a different percentage of calories to each macronutrient, and the calculator converts those percentages into grams using 4 calories per gram for protein and carbs and 9 calories per gram for fat.

Macro tracking is the method used by bodybuilders, physique athletes and anyone on a structured nutrition plan who wants more control than simply counting total calories, since two diets with identical calories can have very different effects on muscle gain, fat loss and satiety depending on the protein-carb-fat mix. Dietitians, personal trainers and nutrition tracking apps all build meal plans around hitting daily macro targets rather than just a calorie ceiling.

Anyone starting a cut, a bulk, or a specific diet protocol like keto or low-carb uses this calculator first to know exactly how many grams of each macro to aim for before planning meals.