How it works
Protein and carbohydrate each provide 4 calories per gram; fat provides 9 calories per gram. Grams = (calories × percentage ÷ 100) ÷ calories-per-gram. The three percentages should add to 100% — the page warns you if they don't. These are estimates only; see a professional for personal nutrition decisions.
Frequently asked questions
What split should I use?
There is no single right split — it depends on your goals, training and health. The defaults here (30/40/30) are a common starting point, not a prescription.
Are these numbers medical advice?
No. They are arithmetic from the calories and percentages you enter. Talk to a professional about your own needs.