Nutrition & supplements
How do you split calories into protein, carbs and fat?
From daily calories to grams of protein, carbs and fat, split per meal and by diet type.
Quick answer
Macros convert calories into grams, and the conversion is not the same for all three: protein and carbohydrate carry 4 kcal per gram, fat 9. On 2,400 kcal with a balanced 30/40/30 split:
Protein
180 g/day
- Per meal (4 meals)
- 45P / 60C / 20F g
Don’t know your calories? Calculate them first with the TDEE calculator. Conversion: 4 kcal/g for protein and carbs, 9 kcal/g for fat. Not a substitute for dietitian advice.
How it works
| Macro | kcal per gram | Share | Grams |
|---|---|---|---|
| Protein | 4 | 30% | 180 g |
| Carbohydrate | 4 | 40% | 240 g |
| Fat | 9 | 30% | 80 g |
Notice how the fat row breaks the pattern: the same 30% share buys less than half the grams, because each gram carries more than twice the energy. It is the reason a low-fat plan looks generous on the plate and a low-carb one does not.
Preset ratios (balanced, Mediterranean, high-protein, low-carb, keto) are starting points — adjust to preference, training and blood markers. If you do not know your calorie target yet, calculate TDEE first, then return here.
Practical order: lock protein from body weight (1.6–2.2 g/kg for lifters; higher when cutting), set fat at ~0.6–1.0 g/kg (hormones and satiety), fill the rest with carbs for training fuel. A food scale nutrition plus glass meal prep containers beats guessing portions; whey protein only patches gaps after whole food.
Rebalance when training changes: race week or heavy lifting often wants more carbs on hard days; rest days can drop carbs and keep protein steady. Weekly averages matter more than perfect daily hits. Guidance only — not medical advice.
Two things sit outside the three-way split and explain most of the cases where the numbers were hit and nothing happened. Alcohol is effectively a fourth macronutrient at seven kilocalories per gram, and no preset accounts for it — two glasses of wine is around 250 kcal that appear in no column. The other is fibre: it is counted inside carbohydrates but behaves nothing like the rest of them, and twenty-five to thirty-five grams a day is the difference between a split that leaves you hungry and the same split that does not. Track it as its own line, even though the ratios ignore it. If the calorie target is not settled yet, work it out first with the TDEE calculator — the split is meaningless until the total is right.
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Frequently asked questions
What macro split is best for muscle gain?+
High-protein (35–40% protein) or balanced with adequate calories. Protein at 1.6–2.2 g/kg matters most; carbs fuel training; fat fills the remainder. A small surplus (~10% above TDEE) drives growth — the ratio alone does not.
Is low carb better for fat loss?+
Fat loss depends on calorie deficit, not carb percentage. Low-carb can reduce appetite for some people, making the deficit easier. Others perform better in the gym with moderate carbs — pick what you can sustain for months, not a week.
Do I need to hit macros exactly every day?+
No — ±5–10 g on protein and ±10–15 g on carbs/fat day-to-day is fine. Weekly averages matter more than perfection. Prioritise protein and total calories first; fine-tune carbs and fat second.
How many calories per gram for alcohol?+
Alcohol is 7 kcal/g — nearly as calorie-dense as fat, but it is not a macronutrient and does not fill the P/C/F pie. Track it separately or count it toward carbs (roughly) in your app; weekend drinks often explain stalled fat loss.
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