How to Calculate Your Macros for Any Fitness Goal (With Real Examples)

I used to roll my eyes at "tracking macros." Sounded like something only competitive bodybuilders needed to bother with. Then I spent six months in a slow, sad bulk where the scale went up but nothing on my body really changed — and a friend asked me how much protein I was eating. I had no idea. Best guess? Probably half of what I needed.

That's when it clicked. Whether your goal is to build muscle, lose fat, or just feel like a functioning human being, your macronutrients are the dials. Calories are how much you eat. Macros are what you eat. Both matter, and most people get neither right.

This guide is the exact 4-step calculation I use, plus two fully worked examples — one for someone bulking, one for fat loss. Bring a calculator (or just trust the app to do it).

What Are Macros, Anyway?

Macronutrients are the three nutrients your body actually burns for fuel:

• Protein — 4 calories per gram. Builds and repairs muscle. Also the most filling macro per calorie, which is why it's so powerful for fat loss.
• Carbohydrates — 4 calories per gram. Your primary fuel for high-intensity exercise. Cutting carbs too low and wondering why your bench feels heavy? There's your answer.
• Fat — 9 calories per gram. Drives hormone production (yes, including testosterone) and helps absorb fat-soluble vitamins (A, D, E, K).

You can hit the same calorie target with wildly different macros — and the result on your body will be wildly different. 2,000 calories of mostly cookies vs. 2,000 calories of chicken, rice, and avocado are not the same investment.

Step 1: Find Your Daily Calorie Target

Before macros, figure out how many calories you should be eating in a day. We do this in three sub-steps.

1a. Calculate Your BMR (Basal Metabolic Rate)

BMR = the calories you'd burn lying motionless in bed for 24 hours. Use the Mifflin-St Jeor equation, which is the most accurate for most people:

• Men: BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age) + 5
• Women: BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age) − 161

1b. Multiply by Your Activity Level

This gives you TDEE (Total Daily Energy Expenditure) — calories burned including movement, exercise, and digestion.

• Sedentary (desk job, no training): BMR × 1.2
• Lightly active (1–3 light sessions/week): BMR × 1.375
• Moderately active (3–5 hard sessions/week): BMR × 1.55
• Very active (6–7 sessions or physical job): BMR × 1.725
• Extremely active (athlete, two-a-days): BMR × 1.9

If you're between two — pick the lower one. Most people overestimate how active they actually are.

1c. Adjust for Your Goal

• Fat Loss: TDEE − 300 to 500 calories (aim for ~1% bodyweight loss per week, max)
• Maintenance: TDEE exactly
• Lean Muscle Gain: TDEE + 200 to 400 calories (any more and you'll just gain fat)

Step 2: Lock In Your Protein

Protein is the most important macro to nail. Period. Underrate it and your "muscle gain" will be 70% fat. Nail it and you'll hold (or build) muscle even in a cut. Research is strikingly consistent on the optimal range:

• Building Muscle: 1.6–2.2 g per kg bodyweight (0.7–1.0 g/lb)
• Fat Loss: 2.0–2.4 g per kg bodyweight (0.9–1.1 g/lb) — higher because protein protects muscle in a deficit
• Maintenance: 1.4–1.8 g per kg bodyweight (0.6–0.8 g/lb)

Quick example: An 80 kg (176 lb) lifter building muscle: 80 × 2 = 160 g of protein per day. Spread across 4 meals, that's 40 g per meal — perfectly doable with chicken, eggs, Greek yogurt, or a shake.

Step 3: Set Your Fat Floor

Fat is the macro most people get wrong. They either eat way too much (avocado toast at every meal) or terrifyingly low (which crashes hormones, libido, and recovery). Here's the safe range:

• Minimum: 0.5 g per kg bodyweight (do not go below this — your hormones will hate you)
• Sweet spot: 0.8–1.2 g per kg bodyweight
• Or simply: 25–35% of total calories

Quick example: 80 kg lifter at 1 g/kg = 80 g of fat = 720 calories from fat.

Step 4: Carbs Get Whatever's Left

Carbs are the most flexible macro. Once protein and fat are set, the rest of your calories go here. Carbs fuel your training, refill muscle glycogen, and frankly make food taste good.

1. Calories from protein = Protein (g) × 4
2. Calories from fat = Fat (g) × 9
3. Remaining calories = Goal calories − protein cals − fat cals
4. Carbs in grams = Remaining calories ÷ 4

Real-World Examples

Example 1: Male, 80 kg, Building Muscle

30-year-old guy, 180 cm tall, lifting 4 days a week.

• BMR: (10 × 80) + (6.25 × 180) − (5 × 30) + 5 = 1,780 cal
• TDEE: 1,780 × 1.55 ≈ 2,759 cal
• Goal calories: 2,800 (small surplus)
• Protein: 80 × 2 = 160 g (640 cal)
• Fat: 80 × 1 = 80 g (720 cal)
• Carbs: (2,800 − 640 − 720) ÷ 4 = 360 g

Final Macros: 160P / 360C / 80F

Example 2: Female, 60 kg, Fat Loss

28-year-old woman, 165 cm tall, 3 lifting sessions a week.

• BMR: (10 × 60) + (6.25 × 165) − (5 × 28) − 161 = 1,330 cal
• TDEE: 1,330 × 1.375 ≈ 1,829 cal
• Goal calories: 1,400 (~400 cal deficit)
• Protein: 60 × 2.2 = 132 g (528 cal)
• Fat: 60 × 0.9 = 54 g (486 cal)
• Carbs: (1,400 − 528 − 486) ÷ 4 ≈ 96 g

Final Macros: 132P / 96C / 54F

How Strict Do You Have to Be?

Within ±5–10 g per macro per day is plenty. You don't need to weigh every grape. The goal is to consistently land in the right range — not to be a prisoner of your kitchen scale. The 80/20 rule applies: hit your protein target precisely, get within ballpark on the others, and you'll see results.

The Bottom Line

Calculating macros is the easy part — it's a 5-minute exercise. The hard part is hitting them every day, which is exactly why most people fail. Tracking turns "I ate roughly enough protein, I think" into actual data you can act on.

Run your numbers. Then download Fit and let it do the daily heavy lifting. Three months from now you'll wonder why you ever guessed.