🥗 Macronutrient Split Calculator

Macronutrients—protein, carbohydrates, and fat—are the three main nutrients your body needs in large amounts for energy, growth, and repair. Each gram of protein provides 4 calories, each gram of carbohydrates provides 4 calories, and each gram of fat provides 9 calories. Tracking your macro split helps you optimize body composition, athletic performance, and overall health beyond simply counting calories.

Your ideal macro split depends on your goal:
• Fat Loss (Cutting): Higher protein (35-45%) preserves muscle; moderate carbs and fat.
• Muscle Gain (Bulking): Ample carbs (40-50%) fuel workouts; protein around 25-35%.
• Maintenance: Balanced approach—roughly 25-35% protein, 40-50% carbs, 25-30% fat.
• Keto: Very low carb (5-10%), high fat (65-75%), moderate protein (20-25%).
Use our preset buttons above as starting points, then fine-tune with the sliders.

General guidelines based on body weight:
• Sedentary adults: 0.8 g per kg of body weight
• Active / recreational athletes: 1.2–1.6 g/kg
• Strength training / muscle building: 1.6–2.2 g/kg
• Fat loss (preserving muscle): 1.8–2.4 g/kg
Enter your body weight in the optional field above to see if your protein target falls within the recommended range.

Carbohydrates are your body's preferred energy source, especially during high-intensity exercise. They replenish muscle glycogen stores, support brain function, and help regulate blood sugar. For athletes and active individuals, carbs should typically make up 40-55% of total calories. Low-carb approaches like keto can work for fat loss but may impact high-intensity performance initially.

No—healthy fats are essential for hormone production (including testosterone), vitamin absorption (A, D, E, K), and cell membrane integrity. Even during fat loss, dietary fat should not drop below 20% of total calories. Focus on unsaturated fats from sources like olive oil, avocados, nuts, and fatty fish. Our calculator ensures fat stays within a healthy range.

This calculator uses the standard Atwater values: 4 kcal/g for protein, 4 kcal/g for carbs, and 9 kcal/g for fat. It distributes your total calorie target precisely according to your chosen percentages. Grams are rounded to the nearest whole number, so the calorie sum may differ by 1-3 kcal from your input—this is normal and negligible for practical meal planning.

Total daily calories represent your energy intake target. Macro-based calories break that total into protein calories + carb calories + fat calories. The two should match. If they don't, it means your macro percentages don't add up to 100%. Our calculator automatically keeps them synchronized—when you adjust one slider, the others recalculate to maintain the 100% total.

Absolutely. Select the Keto preset (P25/C5/F70) or customize the sliders to your preferred keto ratio. Standard ketogenic diets typically aim for 5-10% carbs, 65-75% fat, and 20-25% protein. For a 2,000 kcal keto diet, that's roughly 25g carbs, 156g fat, and 125g protein—always verify with the results panel.

For most people, evenly distributing macros across 3-5 meals works well. Our "Per Meal" estimate assumes 4 equal meals. You can adjust based on your schedule—some prefer a larger post-workout meal with more carbs, or a protein-heavy dinner. The key is hitting your daily totals consistently, not perfect per-meal precision.

Fiber is a type of carbohydrate that the body doesn't fully digest (providing ~2 kcal/g instead of 4). While this calculator treats all carbs as 4 kcal/g for simplicity, you can mentally note that high-fiber foods will yield slightly fewer net calories. Most nutrition labels already account for this. Aim for 25-38g of fiber daily regardless of your macro split for optimal digestive health.