如何计算Macro Split
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A macro split calculator determines the optimal distribution of protein, carbohydrates, and fat in your diet based on total calories and fitness goal. Macronutrients provide different caloric densities and serve different physiological roles.
公式
protein_g = calories × 0.25 / 4; carbs_g = calories × 0.45 / 4; fats_g = calories × 0.30 / 9
- cal
- Daily calories (cal) — Total daily energy intake
- prot_g
- Protein (g) — Amino acid target (1.6–2.2 g/kg for athletes)
- carb_g
- Carbs (g) — Energy source (3–7 g/kg depending on activity)
- fat_g
- Fat (g) — Essential nutrients (0.5–1.5 g/kg)
分步指南
- 1Protein: 4 calories per gram
- 2Carbohydrates: 4 calories per gram
- 3Fat: 9 calories per gram
- 4Split varies: muscle gain (35P/40C/25F), fat loss (40P/30C/30F), endurance (20P/55C/25F)
例题解析
输入
2,000 kcal, muscle building goal
结果
Protein 175g, Carbs 200g, Fat 56g
输入
1,800 kcal, fat loss
结果
Protein 180g, Carbs 135g, Fat 60g
输入
3,000 kcal, endurance sport
结果
Protein 150g, Carbs 413g, Fat 83g
常见问题
What is a good macro split?
Varies: sedentary (25P/45C/30F), athletes (30P/50C/20F), low-carb (40P/20C/40F). Personal goals and activity level drive split.
How do I know my calorie target?
BMR (basal metabolic rate) × activity factor. Or: use a calculator based on age, weight, height, sex, activity level.
Why does macro ratio matter?
Protein preserves muscle; carbs fuel activity; fats support hormones. Ratios affect satiety, energy, body composition.
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