Macronutrient (macro) tracking splits your daily calorie target into protein, carbohydrates, and fat, since different diet and fitness goals call for different ratios. This calculator uses a common general-purpose split of 30% protein, 40% carbs, and 30% fat, converting each into grams based on your daily calorie target, using 4 calories per gram for protein and carbs and 9 calories per gram for fat.