Contents
Key Takeaways
- Macros = protein (4 cal/g), carbs (4 cal/g), fat (9 cal/g).
- Start with TDEE, then set a calorie deficit (loss), surplus (gain), or maintenance.
- Set protein first: 0.7–1.0g per pound of bodyweight for active people.
- Set minimum fat: ~0.35–0.5g/lb for hormonal health.
- Fill remaining calories with carbohydrates.
What Are Macros?
Macronutrients are the three categories of nutrients that provide calories. Everything you eat consists of some combination of protein, carbohydrates, and fat:
- Protein: 4 calories per gram. Essential for muscle repair and growth, immune function, enzymes, and hormones.
- Carbohydrates: 4 calories per gram. Primary fuel for the brain and high-intensity exercise. Includes sugars, starches, and fiber.
- Fat: 9 calories per gram. Required for hormone production, fat-soluble vitamin absorption (A, D, E, K), and cell membrane integrity.
Tracking macros goes beyond simple calorie counting — you control the composition of your diet, not just the quantity. Two people eating 2,000 calories can have very different body composition outcomes depending on whether those calories come mostly from protein or from refined carbohydrates.
Macro Calculator
Calculate your personalized TDEE and macros instantly.
Step 1: Calculate Your TDEE
Total Daily Energy Expenditure (TDEE) is the number of calories you burn per day. It includes your Basal Metabolic Rate (BMR — calories burned at rest) plus your activity level.
Mifflin-St Jeor BMR formula (most accurate):
Men: BMR = (10 × weight kg) + (6.25 × height cm) − (5 × age) + 5
Women: BMR = (10 × weight kg) + (6.25 × height cm) − (5 × age) − 161
Activity multipliers:
| Activity Level | Description | Multiplier |
|---|---|---|
| Sedentary | Desk job, little/no exercise | × 1.2 |
| Light | Exercise 1–3 days/week | × 1.375 |
| Moderate | Exercise 3–5 days/week | × 1.55 |
| Very active | Hard exercise 6–7 days/week | × 1.725 |
| Extremely active | Physical job + daily exercise | × 1.9 |
TDEE = BMR × activity multiplier. Example: 30-year-old man, 180 lbs (82 kg), 5'11" (180 cm), moderately active: BMR = (10×82)+(6.25×180)−(5×30)+5 = 820+1125−150+5 = 1,800. TDEE = 1,800 × 1.55 = 2,790 calories/day.
Step 2: Set Your Calorie Target
Adjust TDEE based on your goal:
- Fat loss: TDEE − 300–500 calories (0.5–1 lb/week loss). A 500-calorie deficit creates roughly a pound per week of fat loss (500 cal × 7 days ÷ 3,500 cal/lb).
- Muscle gain (lean bulk): TDEE + 200–300 calories. A conservative surplus minimizes fat gain while providing energy for muscle synthesis.
- Maintenance: TDEE. Useful for body recomposition (gain muscle/lose fat simultaneously — works best for beginners and those returning after a break).
Step 3: Set Protein
Set protein first — it's the most important macro for body composition and the most likely to be under-consumed.
- General health / sedentary: 0.36g per lb (0.8g/kg) — the RDA minimum
- Weight loss (preserving muscle): 0.7–1.0g per lb (1.6–2.2g/kg)
- Muscle building: 0.7–1.0g per lb (1.6–2.2g/kg)
- Athletes, high volume training: 1.0–1.2g per lb (2.2–2.6g/kg)
Protein calories = grams × 4. A 180 lb person aiming for 1g/lb gets 180g protein = 720 calories from protein.
Step 4: Set Minimum Fat
Fat is essential for hormonal health, vitamin absorption, and brain function. Don't go too low:
- Minimum: 0.35g per lb of bodyweight (0.8g/kg) — adequate for hormonal health
- Moderate: 0.4–0.5g per lb — good balance of health and satiety
For the 180 lb example: 0.4g/lb × 180 = 72g fat = 72 × 9 = 648 calories from fat.
Step 5: Fill Remaining Calories with Carbs
Remaining calories = Total target − protein calories − fat calories
Carb grams = remaining calories ÷ 4
Example (2,290 calorie target for fat loss, 180 lb person):
Protein: 180g = 720 cal
Fat: 72g = 648 cal
Remaining: 2,290 − 720 − 648 = 922 cal
Carbs: 922 ÷ 4 = 231g carbohydrates
Final: 180g protein / 231g carbs / 72g fat at 2,290 calories/day.
Macro Ratios by Goal
| Goal | Protein | Carbs | Fat |
|---|---|---|---|
| Fat loss | 35–40% | 30–35% | 25–30% |
| Muscle gain | 25–30% | 45–50% | 20–25% |
| Maintenance / recomp | 30–35% | 35–40% | 25–30% |
| Endurance athletes | 15–20% | 55–65% | 20–25% |
| Keto (low carb) | 20–25% | 5–10% | 65–75% |
Remember: The best macro split is the one you can actually follow consistently. If you hate eating low-fat, a higher-fat moderate-carb approach will work better for you long-term than forcing a ratio that makes you miserable. Adherence beats optimization.
Frequently Asked Questions
No — a calorie deficit drives weight loss regardless of macro composition. But tracking macros ensures adequate protein (preserving muscle during weight loss) and helps explain why you might lose fat faster on one approach vs. another.
Set protein first (most important), then minimum fat (hormonal health), then fill remaining calories with carbohydrates. This prioritization ensures you never short-change protein or essential fats.
Recalculate when your weight changes by 5–10 lbs, when your activity level significantly changes, or if you plateau for more than 2–3 weeks. Your TDEE changes as your body composition changes.
Many people use hand-portion methods or food templates instead of exact gram tracking. But if you want precise macro targets, you'll need a food scale and a tracking app (MyFitnessPal, Cronometer, etc.) for at least the first few weeks to calibrate your portions.