High Protein Macro Calculator
Split your daily calories into protein, carbohydrate and fat grams on a protein-forward 40/30/30 ratio — worked out with the Atwater factors.
Calculate Your Macros
Enter your daily calorie target. Typical ranges: 1,200–2,000 kcal (weight loss), 2,000–3,000 kcal (maintenance), 3,000–5,000+ kcal (athletic or bulking).
Range: 15–100 years. Adult macro ratios aren’t validated for under-19s — add your age and we’ll flag if these targets need a paediatrician’s sign-off.
Moderate exercise most days of the week. Recommended protein: 1.2–1.6 g/kg body weight (ISSN guidelines).
*This calculator is for informational purposes only. Please consult a healthcare professional before making any health decisions. See our medical disclaimer for more information.
Calculations are powered by the Atwater General Factor System, the universally accepted standard for macronutrient caloric conversion (protein: 4 kcal/g, carbohydrate: 4 kcal/g, fat: 9 kcal/g).
Quick Answer
What Is a High-Protein Macro Split?
A high-protein split gives protein a bigger share of your calories than a balanced ratio — for example 40% rather than 30%. Loaded here as a 40/30/30 split, protein leads, with carbohydrate and fat taking equal thirds. Enter your calorie total above and the calculator converts the split into protein, carbohydrate and fat grams.
A High-Protein % Split vs Grams-per-Kg
This page and the Protein Intake Calculator answer different questions, and they can hand you different numbers. Here, protein is set as a percentage of your calories — pick 40% of the total, then divide those calories by 4 to get grams. The Protein Intake Calculator starts from the other end: it doses protein in grams per kilogram of body weight, so its target depends on how much you weigh rather than on how many calories you eat. A 40% share of a low calorie total can land below a body-weight-based figure, or above it — neither is wrong, they are simply two different starting points. Use this page when you want a calorie split; use that one when you want a body-weight target. Set the split itself with the Macro Calculator.
Worked Example
Take a 2,000-calorie day on the 40/30/30 split. Protein takes 40%, which is 800 calories, and at 4 calories per gram that is 200 grams. Carbohydrate takes 30%, or 600 calories, again at 4 calories per gram — 150 grams. Fat takes the last 30%, 600 calories, but fat carries 9 calories in every gram, so it comes to about 67 grams. Add the calories back — 800 plus 600 plus 600 — and you return to 2,000, the check that the split is complete. Change the calorie total and every gram figure scales with it.
When People Push Protein Up
People commonly raise the protein share in two situations: when eating in a deficit, where higher protein is often used to help preserve muscle while calories are low, and when training with resistance, where protein supplies the building blocks for tissue. Those are the usual reasons the number gets pushed up — described here neutrally, not as a prescription. If you are working out the calorie total for a cut, the Calorie Deficit Calculator sets it; bring that total here to split. These figures are general estimates for healthy adults, not medical advice.
Gram targets use the Atwater general factor system — protein and carbohydrate at 4 calories per gram, fat at 9 — the same standard published in the Dietary Reference Intakes for Macronutrients (National Academies of Sciences, 2005). The split is arithmetic, not a personalised prescription; individual needs vary, so check with a clinician or registered dietitian before making changes if you manage a medical condition.
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