Macronutrients — protein, carbohydrates, and fat — are the three categories of nutrients that provide calories. Tracking macros gives you far more control over body composition than counting calories alone, because the ratio of macros determines whether you lose fat, build muscle, or both.
Step 1: Calculate Your TDEE
Before setting macros, you need to know your Total Daily Energy Expenditure. Use the TDEE Calculator to find your maintenance calories. Then adjust based on your goal:
- Fat loss: TDEE minus 300–500 calories
- Maintenance: Eat at TDEE
- Muscle gain: TDEE plus 200–400 calories
Step 2: Set Protein First
Fat loss: 0.8 – 1.2 g per lb body weight Maintenance: 0.7 – 1.0 g per lb body weight Muscle gain: 0.8 – 1.2 g per lb body weight Protein is the priority macro. It preserves muscle during a deficit, drives muscle growth during a surplus, and has the highest thermic effect (20–30% of protein calories are burned during digestion).
Step 3: Set Fat
Fat should be 20–35% of total calories. Going below 20% can disrupt hormone production. A good starting point is 0.3–0.4 grams per pound of body weight. Fat has 9 calories per gram.
Step 4: Fill Remaining Calories with Carbs
Carbs get whatever is left after protein and fat are set. Carbs have 4 calories per gram, same as protein.
Example: 170 lb male, fat loss at 2,000 calories
| Macro | Target | Grams | Calories |
|---|---|---|---|
| Protein | 1g/lb | 170g | 680 cal |
| Fat | 0.35g/lb | 60g | 540 cal |
| Carbs | Remainder | 195g | 780 cal |
| Total | 2,000 cal |
Calculate your exact macros with the Macro Calculator.
Key Takeaways
- Set protein first at 0.8–1.2g per pound of body weight.
- Fat at 20–35% of total calories for hormonal health.
- Carbs fill the remaining calories after protein and fat are set.
- Track for 2–4 weeks and adjust based on results, not just the math.
Frequently Asked Questions
Do macros matter more than total calories?
Both matter. Total calories determine whether you gain or lose weight. Macros determine what kind of weight (fat vs muscle) and how you feel. For body composition, macros are critical. For pure weight change, calories are king.
How do I track macros without going crazy?
Use an app like MyFitnessPal or Cronometer for the first 2-4 weeks to learn portion sizes. Once you have a good sense of your regular meals, you can track more loosely. Hitting within 10% of targets is sufficient.
Should I eat the same macros on rest days?
For most people, keeping macros consistent is simplest and most effective. Advanced trainees may benefit from carb cycling (higher carbs on training days, lower on rest days) while keeping protein and total weekly calories the same.