Macros, simply
Macronutrients, or macros, are the three nutrients that supply calories: carbohydrate, protein and fat. Counting calories tells you how much you eat; looking at macros tells you what those calories are made of. Many people find it easier to plan meals around a daily number of grams of each.
This macro calculator takes your daily calories and a split, and turns them into grams. The ready-made splits all stay inside the official adult ranges, and if you enter your own split, it tells you when a share falls outside them.
How to use it
- Find your daily calories with the TDEE calculator or the calorie calculator, or use a target you already have.
- Choose a ready-made split, or My own split to type the percentages.
- Read the grams of carbohydrate, protein and fat for the day, and per meal over three meals.
- Check the last line: it confirms whether each share sits inside the adult ranges.
The macro formula
grams = daily calories × share ÷ calories per gram
carbohydrate: 4 calories per gram; protein: 4; fat: 9For adults, the advised ranges are 45 to 65% of calories from carbohydrate, 20 to 35% from fat and 10 to 35% from protein, as set out in the NIH StatPearls chapter on calories, which also gives the 4, 4 and 9 calories per gram. Because fat holds more than twice the calories per gram, the same share of calories gives far fewer grams of fat.
Worked example: 2,000 calories, balanced split
- Carbohydrate: 2,000 × 50% = 1,000 calories ÷ 4 = 250 g carbs
- Protein: 2,000 × 20% = 400 calories ÷ 4 = 100 g protein
- Fat: 2,000 × 30% = 600 calories ÷ 9 = 67 g fat
A 2,000 calorie day on the balanced split is 250 g carbs, 100 g protein and 67 g fat, or roughly 83 g, 33 g and 22 g at each of three meals.
Balanced split at other calorie levels
| Calories | Carbohydrate | Protein | Fat |
|---|---|---|---|
| 1,600 | 200 g | 80 g | 53 g |
| 2,000 | 250 g | 100 g | 67 g |
| 2,400 | 300 g | 120 g | 80 g |
The grams scale in step with calories, so a quick check is easy: 10% more calories means 10% more of each. Round to the nearest few grams when planning meals.
Choosing a split
- Balanced suits most people and sits near the middle of every range.
- Higher protein can help some people feel full; the protein calculator shows the minimum for your weight.
- Lower or higher carbohydrate is mostly about preference and how you like to eat.
- Food quality matters as much as the numbers: whole grains, vegetables, fruit, beans and less processed food.
Frequently asked questions
How do I calculate my macros?
Start with your daily calories, then choose what share of them should come from carbohydrate, protein and fat. Multiply the calories by each share, then divide by 4 for carbohydrate and protein, or by 9 for fat. For 2,000 calories at 50% carbohydrate, that is 1,000 ÷ 4 = 250 grams.
What is a good macro split?
For adults, the official ranges are 45 to 65% of calories from carbohydrate, 20 to 35% from fat and 10 to 35% from protein. Any split inside them is reasonable for most healthy people. A balanced 50, 30 and 20 is a sensible place to start, and you can adjust from there.
Why does fat have fewer grams than carbohydrate?
Fat supplies 9 calories per gram, more than twice the 4 calories in a gram of carbohydrate or protein. So the same number of calories comes from far fewer grams of fat. At 2,000 calories, 30% from fat is only about 67 grams, while 50% from carbohydrate is 250 grams.
Do I need to hit my macros exactly?
No. Macros are a planning guide, and most people do well landing within a few grams of each target over a typical day or week. Steady habits, enough protein and plenty of whole foods matter more than exact numbers. Adjust if your energy, hunger or progress tells you to.
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