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Macro Calculator
Calories decide whether your weight moves; macros decide how that change feels and what it's made of. This macro calculator converts your daily calorie target into grams of protein, carbohydrate, and fat — with three evidence-based splits and the arithmetic in plain sight.
Your Facts
Fill in the form and press Calculate — your personal label prints here.
The conversion itself is simple bookkeeping: protein and carbohydrate carry 4 kcal per gram, fat carries 9. The judgment call is the ratio. Protein protects muscle and controls hunger, fat supports hormones and vitamin absorption, and carbohydrate fuels training — the right balance depends on your goal and, honestly, your food preferences.
Calculate your numbers below, then use the split toggle to compare how balanced, high-protein, and low-carb targets translate into actual grams on your plate.
The three splits, and who they're for
Balanced (30% protein / 40% carb / 30% fat) is the default for a reason: it satisfies protein needs for most active people, leaves enough carbohydrate to train well, and doesn't demonize any food group. If you're unsure, start here.
High protein (40/30/30) shifts calories toward protein — useful in a calorie deficit, where higher protein intake measurably preserves lean mass and blunts hunger, and for lifters chasing body composition. The practical cost is that 40% protein takes deliberate planning: it's a lot of chicken, fish, eggs, yogurt, and legumes.
Low carb (40/20/40) suits people who feel steadier eating fewer carbohydrates, train at low intensity, or simply prefer fat-rich foods. It is not metabolically magic — controlled studies show equal fat loss when calories and protein match — but adherence is personal, and the best split is the one you'll sustain.
Protein first: the one macro with a hard target
If you ignore everything else on this page, set protein. The research consensus for active adults sits at 1.6–2.2 g per kilogram of body weight per day (about 0.7–1 g per pound), with the higher end most valuable while dieting. Below that range, muscle loss accelerates in a deficit; above it, benefits plateau.
Fat has a sensible floor too — roughly 0.5–0.8 g per kilogram — below which hormone production and fat-soluble vitamin absorption can suffer. Carbohydrate then fills whatever calories remain. This 'protein first, fat floor, carbs fill' logic is exactly how the percentage splits above were constructed.
Tracking macros without losing your mind
Perfect macro tracking is neither possible nor necessary. Food labels are legally allowed meaningful error, restaurant portions vary, and your own scale-free estimates drift. Aim to land within ±10 g of protein and ±5% of calories, and treat carb/fat wobble as free play.
A sustainable pattern: hit your protein target daily, hit your calorie target on the weekly average, and let carbs and fat float with your appetite and schedule. If tracking every gram stops serving you, keep only the protein habit — it carries most of the practical benefit.
Frequently asked questions
Macronutrients — protein, carbohydrate, and fat — are the three nutrients your body needs in large amounts, and the source of all food calories. Protein and carbs provide 4 kcal per gram; fat provides 9. 'Counting macros' means hitting daily gram targets for each rather than tracking calories alone.
The split that keeps you full while calories stay in deficit. Evidence favors higher protein (roughly 40/30/30) during weight loss because it preserves muscle and reduces hunger; between low-carb and low-fat approaches, controlled trials show equal fat loss when calories and protein are matched. Pick the one you can maintain.
Active adults do best with 1.6–2.2 g per kilogram of body weight daily (0.7–1 g per pound) — for a 70 kg person, 112–154 g. Sedentary adults need less (the RDA is 0.8 g/kg), but that's a floor to prevent deficiency, not an optimum for body composition.
Macros include calories: hit your gram targets and your calories land automatically. Counting macros adds precision about where calories come from, at the cost of more bookkeeping. A practical middle path is tracking calories plus protein only.