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Counting calories tells you how much to eat. Counting macros tells you what to eat — how to split those calories between protein, carbs, and fat. That split is what makes the difference between losing fat while keeping muscle, fueling hard training, or following a keto diet. This guide explains exactly how to calculate your macros, the best splits for each goal, and how protein fits in. To get your numbers instantly, use our free Macro Calculator.

What Are Macros?

Macros — short for macronutrients — are the three nutrients your body needs in large amounts for energy: protein, carbohydrate, and fat. Each provides a known number of calories per gram:

• Protein: 4 calories per gram
• Carbohydrate: 4 calories per gram
• Fat: 9 calories per gram

Tracking macros rather than just calories is the basis of flexible dieting, often called IIFYM — “If It Fits Your Macros.”

How to Calculate Your Macros (Step by Step)

It’s a three-step process:

1. Find your daily calories. Start from your TDEE (total daily energy expenditure) and adjust for your goal — subtract about 500 for weight loss, add about 500 for gain.
2. Pick a macro split as percentages of those calories (for example 30% protein, 40% carbs, 30% fat).
3. Convert to grams using the calories-per-gram values.

The formula for each macro is:

Grams = (Total Calories × Split%) ÷ calories-per-gram

Worked example on 2,000 calories with a balanced 30/40/30 split:

• Protein: (2000 × 0.30) ÷ 4 = 150 g
• Carbs: (2000 × 0.40) ÷ 4 = 200 g
• Fat: (2000 × 0.30) ÷ 9 ≈ 67 g

Our Macro Calculator does all three steps — and can estimate your calories for you if you don’t have them yet.

Best Macro Splits by Goal

• Balanced (30P / 40C / 30F): general health and maintenance.
• High protein (40P / 30C / 30F): fat loss while preserving muscle.
• Low carb (40P / 20C / 40F): lower-carb dieting.
• Keto (25P / 5C / 70F): ketogenic diet, very low carb.
• Endurance (25P / 55C / 20F): runners, cyclists, high training volume.

There’s no single “best” split — the right one depends on your goal, your training, and what you can stick to. The biggest lever for weight change is still your calorie total; the split mainly affects body composition, energy, and hunger.

Why Protein Deserves Special Attention

Protein is the macro most worth getting right. It preserves lean muscle during a calorie deficit, keeps you fuller than carbs or fat, and has the highest thermic effect — your body burns more energy digesting it. A widely used guideline for active people is about 0.7–1.0 grams of protein per pound of body weight (roughly 1.6–2.2 g/kg). If a percentage-based split leaves you below that, switch to the high-protein option.

Macros Are the Last Step: BMR → TDEE → Calories → Macros

Macros sit at the end of a chain of calculations:

1. BMR — calories burned at rest. Find it with our BMR Calculator.
2. TDEE — BMR times your activity level. Use the TDEE Calculator.
3. Calorie target — TDEE adjusted for your goal. See the Calorie Calculator.
4. Macros — split those calories into protein, carbs, and fat here.

Work through all four and you have a complete, personalised nutrition picture.