Macro Calculator
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Calculate your daily protein, carbs, and fat targets based on your calorie goal and chosen macro split.
Daily Macro Targets
📐 Formula
Protein (g) = Calories × Protein% ÷ 4. Carbs (g) = Calories × Carb% ÷ 4. Fat (g) = Calories × Fat% ÷ 9
How to Use the Macro Calculator
Enter your calorie target
Input your TDEE (Total Daily Energy Expenditure) as the starting point. If you want to lose weight, subtract 300–500 calories first. If gaining, add 200–300. Use the Calorie Calculator or BMR Calculator to find your TDEE.
Select your goal
Choose weight loss, maintenance, or muscle gain. Each goal uses a different macro split: higher protein for weight loss (to preserve muscle), moderate protein for maintenance, high protein and moderate carbs for muscle gain.
Adjust the percentages if needed
The default splits are evidence-based starting points. Adjust based on food preference, training type, and how your body responds. A carbohydrate-intolerant person may do better with a lower-carb split; an endurance athlete needs more carbs.
Convert to food portions
Translate your gram targets into actual foods: 1 large chicken breast ≈ 50g protein; 1 cup cooked rice ≈ 45g carbs; 1 tablespoon olive oil ≈ 14g fat. Tracking apps like MyFitnessPal apply these automatically.
Understanding the Three Macronutrients
Protein (4 cal/gram) is essential for muscle repair and synthesis, immune function, enzyme production, and satiety. For active individuals aiming to change body composition, research supports 1.6–2.2g per kg of bodyweight (0.7–1g per pound) daily. Prioritising protein intake is consistently the highest-leverage dietary variable for both fat loss and muscle gain.
Carbohydrates (4 cal/gram) are the body's primary energy source, particularly for high-intensity exercise. They fuel the brain, replenish glycogen stores, and spare protein from being used for energy. Reducing carbohydrates (but not eliminating them) is effective for weight loss; increasing them supports athletic performance and recovery.
Fat (9 cal/gram) is essential for hormone production (including testosterone and estrogen), fat-soluble vitamin absorption (A, D, E, K), cell membrane integrity, and long-duration, lower-intensity energy. A minimum of 20% of total calories from fat is recommended to support hormonal health; going below this for extended periods can impair recovery and hormone balance.
Common Macro Splits by Goal
Weight loss: 40% protein / 30% carbs / 30% fat. High protein preserves muscle mass during a calorie deficit and maximises satiety. Lower carbs reduce insulin-driven fat storage. Maintenance / General health: 30% protein / 40% carbs / 30% fat. Balanced approach that suits most lifestyles. Muscle gain: 30% protein / 45% carbs / 25% fat. Higher carbs to fuel training and maximise glycogen stores; sufficient protein to support muscle protein synthesis. Endurance athletes: 20% protein / 55–60% carbs / 20–25% fat. Carbohydrate availability is the limiting factor for sustained endurance performance.
Hitting Macros vs Hitting Calories: Which Matters More?
For body weight changes, total calories are the primary determinant — a calorie deficit produces weight loss regardless of macro ratios. However, macros determine body composition within that calorie context: high-protein deficits preserve significantly more muscle than low-protein deficits. For athletic performance, carbohydrate and fat timing around training matter considerably. For most people in a general fitness context, hitting protein targets first and meeting total calorie goals is more practical than perfect macro splits — and produces 90% of the benefit of precise tracking.
How to Calculate Macronutrient Targets by Hand: Worked Example
Take a 2,400-calorie daily target split using a common 40% carbs / 30% protein / 30% fat ratio.
Step 1 — allocate calories by percentage. Protein: 2,400 × 0.30 = 720 calories. Carbs: 2,400 × 0.40 = 960 calories. Fat: 2,400 × 0.30 = 720 calories.
Step 2 — convert calories to grams using each macronutrient's energy density: protein and carbs both provide 4 calories per gram; fat provides 9 calories per gram.
Protein: 720 ÷ 4 = 180g. Carbs: 960 ÷ 4 = 240g. Fat: 720 ÷ 9 = 80g.
Verification: (180×4) + (240×4) + (80×9) = 720 + 960 + 720 = 2,400 calories — the split is internally consistent, and this check is worth running any time macros are calculated manually, since a rounding error in one macro is easy to miss otherwise.
How Should Macro Splits Change Based on Your Goal?
Why do fat-loss and muscle-gain macro splits typically differ?
A common fat-loss-focused split runs closer to 40% protein / 35% carbs / 25% fat — prioritizing protein to help preserve muscle mass during a calorie deficit. A muscle-gain split more often runs 30% protein / 45% carbs / 25% fat, since the calorie surplus itself drives growth and additional carbohydrate supports the higher training volume typically paired with a bulking phase. Neither split is universally "correct" — they reflect different priorities under different calorie conditions.
Is hitting exact macro grams more important than hitting total calories?
Total calories remain the primary driver of weight change in either direction; macro ratios are a secondary lever that influences hunger, energy levels, training performance, and (during a deficit specifically) how much of the weight lost comes from fat versus muscle. Someone who hits their calorie target but consistently misses protein by 40–50g daily during a cut is more likely to lose lean mass alongside fat than someone hitting both numbers precisely.
Why is 4 calories per gram used for both protein and carbs despite them being chemically different?
This is the Atwater system, a long-standing nutritional science convention that estimates the metabolizable energy the body extracts from each macronutrient after accounting for digestive losses, not a claim that protein and carbohydrate molecules contain identical raw energy. It's an approximation good enough for practical meal planning, though the true metabolizable energy varies slightly by specific food source and individual digestion.
Frequently Asked Questions
A common recommendation is 0.7–1g of protein per pound of bodyweight (1.5–2.2g per kg) for active individuals. Sedentary adults need about 0.36g per pound. Protein supports muscle maintenance and satiety.
A common weight loss split is 40% protein, 30% carbs, 30% fat. Higher protein preserves muscle while in a calorie deficit. Always prioritise hitting your calorie goal first.
Protein: 4 calories/gram. Carbohydrates: 4 calories/gram. Fat: 9 calories/gram. Alcohol is 7 calories/gram but provides no nutritional value.
Sources & Methodology
Calculations are based on the most current publicly available data from authoritative government and industry sources: