Health Formula • Published on September 01, 2026 • Last updated September 01, 2026
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Daily target calorie intake, itself derived from BMR × activity level, adjusted for a fitness goal
Percentage of total calories allocated to protein, carbs, and fat, which vary by diet type (e.g. balanced 30/35/35, keto 20/5/75)
Calories per gram: protein and carbohydrates provide 4 kcal/g, fat provides 9 kcal/g
Once a daily calorie target is set, that budget must be split across the three macronutrients.
Each diet archetype allocates a different percentage of calories to protein, carbs, and fat — for example, a ketogenic diet allocates only 5% to carbs and 75% to fat, while a balanced diet spreads more evenly.
Converting each macro's calorie share into grams requires dividing by its calories-per-gram value (4 for protein/carbs, 9 for fat, since fat is more energy-dense).
Fat is more energy-dense per gram than protein or carbohydrates due to its chemical structure, so the same calorie allocation converts to fewer grams of fat than it would for protein or carbs.
No single macro split is universally best — adherence matters more than the specific ratio for most people, so the best diet type is generally whichever macro distribution someone can sustainably stick to while maintaining an appropriate calorie target.
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