Protein, Carbs, Fat: The Complete Macro Splitting Guide for Your Goal
Keto, low-carb, high-carb, IIFYM — everyone has an opinion on macros. Here's what the science actually says about optimal macro splits for fat loss, muscle gain, and maintenance.
Why Calories Alone Aren't Enough
Two people eating 2,000 calories can have wildly different body compositions. Person A: 200g protein, 150g carbs, 67g fat. Person B: 50g protein, 300g carbs, 44g fat. Same calories, different results.
A 2018 meta-analysis in the British Journal of Sports Medicine found that high-protein diets resulted in 0.5kg more fat loss per month than low-protein diets with the same calorie count.
Macro Splits by Goal
| Goal | Protein | Carbs | Fat |
|---|---|---|---|
| Fat Loss | 40% | 30% | 30% |
| Muscle Gain | 30% | 45% | 25% |
| Maintenance | 30% | 40% | 30% |
| Endurance | 20% | 55% | 25% |
| Keto | 25% | 5% | 70% |
Step-by-Step: Calculate Your Macros
- Open the macro calculator
- Enter your stats and select your goal (fat loss, muscle gain, maintenance)
- Get your daily protein, carbs, and fat targets in grams
- Use a food tracking app to hit these targets within +/- 10%
- Weigh yourself weekly at the same time. Adjust macros if no change after 2 weeks.
Protein Sources: Getting to 150g+
If you need 150g of protein per day, here's what that looks like:
- Breakfast: 3 eggs (18g) + Greek yogurt (15g) = 33g
- Lunch: Chicken breast 200g (46g) + rice = 46g
- Snack: Protein shake (25g) = 25g
- Dinner: Salmon 200g (40g) + vegetables = 40g
- Total: 144g
Try it now: Calculate Your Macros →
Personalized macros based on your body, goal, and activity level.
Frequently Asked Questions
What is the best macro split for fat loss?
A common evidence-based split is 40% protein, 30% carbs, 30% fat. High protein (1g per lb of body weight) preserves muscle during a deficit and increases satiety.
How much protein do I need to build muscle?
Research supports 0.7-1g of protein per pound of body weight for muscle growth. Going above 1g/lb shows no additional benefit for natural lifters.
Should I count macros or calories?
Counting macros is more precise because it ensures you're getting adequate protein. Counting only calories might lead to undereating protein and overeating carbs/fat.