What Are Macros?
Macronutrients — or "macros" — are the three main categories of nutrients that provide calories: protein, carbohydrates, and fat. Every food you eat is made up of some combination of these three. Tracking and adjusting your macros is one of the most effective ways to support your fitness goals, whether you want to lose fat, build muscle, or simply perform better.
Step 1: Find Your Maintenance Calories (TDEE)
Before setting macros, you need to know your Total Daily Energy Expenditure (TDEE) — the number of calories your body burns in a day. You can use a TDEE calculator online (search "TDEE calculator"), which factors in your age, height, weight, and activity level.
Once you know your TDEE, adjust calories based on your goal:
- Fat loss: Subtract 300–500 calories from TDEE
- Muscle building: Add 200–350 calories to TDEE
- Maintenance / recomposition: Stay at TDEE
Step 2: Set Your Protein Target First
Protein is the most important macro for body composition. It preserves muscle during a cut, supports muscle growth during a bulk, and keeps you fuller longer. A widely supported guideline is:
- General fitness: 0.7–1.0g per pound of bodyweight per day
- Active muscle-building phase: 1.0–1.2g per pound of bodyweight
- Cutting phase: 1.0–1.2g per pound (higher protein helps preserve muscle)
Each gram of protein contains 4 calories. Calculate your protein calories first, then divide the rest between carbs and fat.
Step 3: Allocate Fat
Dietary fat is essential for hormone production, joint health, and absorbing fat-soluble vitamins (A, D, E, K). Don't cut it too low. A reasonable baseline is 0.35–0.5g of fat per pound of bodyweight, or about 25–35% of total calories.
Each gram of fat contains 9 calories.
Step 4: Fill the Rest with Carbohydrates
After you've allocated calories to protein and fat, the remaining calories go to carbohydrates. Carbs are your body's preferred fuel source, especially for resistance training and high-intensity cardio. Don't fear them — they power your performance.
Each gram of carbohydrate contains 4 calories.
Example Macro Calculation
| Detail | Value |
|---|---|
| Bodyweight | 170 lbs |
| TDEE | 2,600 calories |
| Goal | Fat loss (–400 cal) |
| Target calories | 2,200 |
| Protein (1g/lb) | 170g = 680 cal |
| Fat (0.4g/lb) | 68g = 612 cal |
| Carbs (remaining) | 227g = 908 cal |
Tips for Hitting Your Macros
Use a Tracking App
Apps like MyFitnessPal or Cronometer make logging meals straightforward. You don't need to be perfect — within 10% of your targets is close enough for most people.
Meal Prep Helps
Preparing meals in advance takes the guesswork out of daily eating. When your food is ready and weighed, hitting your numbers becomes much easier.
Don't Obsess
Macro tracking is a tool, not a lifestyle sentence. Many people track closely for a few months, learn what their diet looks like, then shift to more intuitive eating with occasional check-ins.
Which Macro Matters Most?
If you can only focus on one thing, make it protein. Hit your protein target consistently, keep total calories in the right range, and you'll be in a strong position regardless of how precisely the carbs and fat split out.