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High-Protein Macro Calculator

Enter your daily calories, body weight, and protein ratio to get a high-protein macro split.

How it is calculated

Protein is fixed first, then the calories left over are split in half. protein (g) = weight (kg) × protein ratio (g/kg). Protein calories are protein g × 4. The remainder is remaining kcal = daily kcal − protein kcal; half goes to carbohydrate (÷ 4 kcal per gram) and half to fat (÷ 9 kcal per gram). The protein share shown is protein kcal ÷ daily kcal × 100. All gram values are rounded to whole grams. If the protein you ask for already uses all of your calories, there is nothing left to split and the tool returns no result.

Worked example

Daily calories 2400, body weight 80 kg, protein ratio 2 g/kg. Protein = 80 × 2 = 160 g, which is 640 kcal. Remaining = 2400 − 640 = 1760 kcal, split into 880 kcal carbohydrate and 880 kcal fat. Carbohydrate = 880 ÷ 4 = 220 g. Fat = 880 ÷ 9 = 97.8, shown as 98 g. Protein supplies 640 ÷ 2400 = 26.67% of the calories.

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Common mistakes

  • Entering body weight in pounds. The field is kilograms, so 176 lb must be entered as about 80 kg.
  • Entering a grams-per-pound ratio (for example 0.9) in a grams-per-kilogram field, which understates protein by more than half.
  • Typing maintenance calories when you are cutting or bulking. The split is built on the calories you enter, so enter your actual target.
  • Choosing a very high g/kg ratio with a low calorie target. Protein can eat the whole budget, and the tool then returns nothing because no calories remain for carbohydrate and fat.
  • Expecting a different carb-to-fat ratio. The leftover calories are always divided 50/50, so adjust by hand if you prefer more carbohydrate or more fat.

Sources

About this calculator

This calculator builds a high-protein macro split by first setting protein based on a grams-per-kilogram of body weight ratio (commonly in the 1.6-2.2 g/kg range for muscle building or retention during a deficit, per sports nutrition research), converting that to calories at 4 calories per gram, then dividing the remaining calories evenly between carbohydrates and fat (4 and 9 calories per gram respectively) to fill out the rest of the daily target.

Setting protein by body weight rather than as a flat percentage of calories is the approach favored in most sports nutrition guidance, since protein needs scale with lean body mass and training demands rather than total energy intake — someone eating fewer calories on a cut still needs adequate protein to preserve muscle, which a simple 30%-of-calories rule can understate. Bodybuilders, strength athletes, and anyone dieting while trying to preserve muscle mass use this g/kg-first approach to make sure protein is adequate before the rest of the diet is built around it.

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