❤️ Health
How to Calculate Your Macros from a Calorie Target
How to split a daily calorie goal into grams of protein, carbohydrate and fat, what the common macro ratios mean, and how to pick a split that fits your goal.
Updated 5 October 2026 · 2 min read
Once you know roughly how many calories you want in a day, the next question is where those calories come from. "Macros" — short for macronutrients — are the three things that carry energy: protein, carbohydrate and fat. Splitting your calorie target between them is what turns a single number into an actual eating plan.
Calories per gram
The whole calculation rests on three fixed conversion rates. Protein and carbohydrate each release about 4 calories per gram, while fat is more energy-dense at 9 calories per gram. That's why a "low-fat" swap saves more calories per gram removed than cutting carbs does.
A worked example
Suppose your target is 2,000 kcal on a balanced 50 / 25 / 25 split (carb / protein / fat). Carbs take 50% — that's 1,000 kcal, which at 4 kcal/g is 250 g. Protein takes 25% — 500 kcal ÷ 4 = 125 g. Fat takes the last 25% — 500 kcal ÷ 9 = about 56 g. Those three numbers are your daily targets, and they always add back up to your calorie goal.
Choosing a split
- Balanced (50 / 25 / 25) — a sensible default for general health and steady energy.
- High protein (40 / 40 / 20) — favoured when building or keeping muscle, or dieting, because protein is filling and protects lean mass.
- Low carb (25 / 40 / 35) — fewer carbs, more fat and protein, which some people find steadier for appetite.
- Keto (5 / 30 / 65) — very low carb and high fat, aimed at shifting the body towards burning fat for fuel.
- Endurance (60 / 20 / 20) — carb-heavy to fuel long training sessions.
Making the numbers work
No split is magic — total calories still drive weight change, and the ratio mostly affects how you feel, train and hold on to muscle. Protein is the one worth anchoring first, since it's the hardest to hit by accident. Treat the grams as a target to aim near, not a rule to obsess over, and adjust after a couple of weeks based on results and how you feel.
The macro calculator turns any calorie target and split into grams of each macro in one step. To work out the calorie target itself, start with TDEE and calories explained, and if you're using this to manage weight, what is my ideal weight gives a healthy range to aim for.
Frequently asked questions
- How do I turn a calorie target into grams of macros?
- Multiply your calories by each macro's percentage share, then divide by its calories per gram — 4 for protein and carbs, 9 for fat. For 2,000 kcal at 50/25/25 that's 250 g carbs, 125 g protein and about 56 g fat.
- Which macro split is best?
- There's no single best split — total calories matter most. A balanced 50/25/25 suits general health, higher protein helps when keeping muscle or dieting, and endurance athletes often need more carbs. Pick one that fits your goal and adjust after a couple of weeks.
- Why does fat have more calories per gram?
- Fat packs about 9 calories into every gram, against 4 for protein and carbohydrate, because of how its molecules store energy. That's why fat portions look small for the calories they carry.