What are macronutrients?
Macronutrients are the three main nutrients your body needs in large amounts: protein, carbohydrates, and fat. Each serves essential functions for health and performance, and the calculator splits them according to your daily calories and goal.
With 2,000 kcal/day and a 30/40/30 split (protein/carbs/fat): 150 g protein, 200 g carbs, and 67 g fat per day.
How are macros calculated?
Protein: 4 kcal/g Carbohydrates: 4 kcal/g Fat: 9 kcal/g
Macros are calculated as a percentage of your daily calories and then converted to grams by dividing by each nutrient's calories per gram.
Splits by goal
| Goal | Protein | Carbohydrates | Fat | |---|---|---|---| | Maintenance | 30% | 40% | 30% | | Weight loss | 40% | 30% | 30% | | Muscle gain | 30% | 45% | 25% | | Keto diet | 25% | 5% | 70% |
Step-by-step example (2,000 kcal, 30/40/30)
- Protein calories = 2,000 × 0.30 = 600 kcal → 600 ÷ 4 = 150 g
- Carb calories = 2,000 × 0.40 = 800 kcal → 800 ÷ 4 = 200 g
- Fat calories = 2,000 × 0.30 = 600 kcal → 600 ÷ 9 = 66.7 g
Scenario table (30/40/30)
| Daily calories | Protein | Carbohydrates | Fat | |---|---|---|---| | 1,600 | 120 g | 160 g | 53 g | | 2,000 | 150 g | 200 g | 67 g | | 2,400 | 180 g | 240 g | 80 g | | 3,000 | 225 g | 300 g | 100 g |
How to read the result
Protein is the most important macronutrient for satiety and muscle: the general recommendation is 0.8-1 g per kg of body weight for sedentary people and 1.6-2.2 g/kg for active people. Carbohydrates are the main energy source; fats are essential for hormones and vitamin absorption. The splits are starting points: adjust based on your response, energy, and progress.
The percentages are educational references, not prescriptions. Real needs depend on your activity, health, and preferences. Consult a nutritionist for personalized plans, especially with medical conditions.
Frequently asked questions
They are the three main nutrients the body needs in large amounts: protein, carbohydrates, and fat. Each serves essential functions for health and performance.
They are calculated as a percentage of your daily calories. Protein and carbs provide 4 calories per gram, and fat provides 9 calories per gram.
It depends on your goal: maintenance 30/40/30, weight loss 40/30/30, muscle gain 30/45/25, keto 25/5/70 (protein/carbs/fat).
The general recommendation is 0.8-1 g per kg of body weight for sedentary people and 1.6-2.2 g/kg for active people or those looking to build muscle.
Fat provides 9 kcal/g versus 4 kcal/g for protein and carbs. That is why a high-fat diet is much more calorie-dense for the same weight of food.
Related calculators
- Daily calories (TDEE): calculate your target calories
- Calories: calorie requirements by age and activity
- Body fat: measure your body composition
- Basal metabolism: your resting expenditure