Understanding Macros: A Beginner's Guide to Counting Macronutrients
Counting macros is one of the most effective nutrition approaches for body composition — whether you're trying to lose fat, build muscle, or just understand what you're actually eating. Here's how it works.
What Are Macronutrients?
- Protein — 4 calories per gram. Builds and repairs muscle tissue. Highest satiety per calorie. Found in meat, fish, eggs, dairy, legumes, tofu.
- Carbohydrates — 4 calories per gram. Primary fuel source, especially for high-intensity activity. Found in grains, fruit, starchy vegetables, sugar.
- Fat — 9 calories per gram. Supports hormones, brain function, fat-soluble vitamin absorption. Found in oils, nuts, meat, dairy, avocados.
Step 1: Calculate Your Maintenance Calories (TDEE)
Total Daily Energy Expenditure (TDEE) is calculated by multiplying your BMR by an activity multiplier:
- Sedentary (desk job, little exercise): BMR × 1.2
- Lightly active (1–3 workouts/week): BMR × 1.375
- Moderately active (3–5 workouts/week): BMR × 1.55
- Very active (6–7 hard workouts/week): BMR × 1.725
Use our TDEE calculator to get your number. This is your maintenance — eat at this level and your weight stays flat.
Step 2: Set Your Calorie Goal
- Fat loss: TDEE minus 300–500 calories/day. 500 cal deficit ≈ 1 lb/week lost.
- Muscle gain (lean bulk): TDEE plus 200–300 calories/day. Larger surplus just adds fat. Realistic muscle gain is 0.5–1 lb/month for most people.
- Body recomp: Stay at or slightly below TDEE. Lose fat and gain muscle simultaneously — works best for beginners.
Step 3: Split Calories Into Macros
- Protein: 0.7–1g per pound of bodyweight. This is the most important macro — too low and you lose muscle during a deficit or fail to build during a surplus.
- Fat: Minimum 0.3g per pound of bodyweight. Fat below 20% of total calories disrupts hormones.
- Carbohydrates: Whatever's left after protein and fat.
Example (175 lb person, 2,200 cal deficit): Protein 175g = 700 cal. Fat 60g = 540 cal. Carbs: (2,200 − 1,240) ÷ 4 = 240g.
IIFYM: If It Fits Your Macros
IIFYM is the approach of eating any food as long as it fits your daily macro targets — no "clean eating" restrictions, no banned foods. The research supports this: total calorie and macronutrient intake drives body composition outcomes more than food choice. A deficit is a deficit whether you're eating chicken and broccoli or fitting in a slice of pizza.
Use our macro calculator to get a personalized starting point based on your stats and goal.