Grams to calories formula
Calories come from macronutrients. Protein and carbs provide about 4 kcal per gram, fat provides about 9 kcal per gram, and alcohol provides about 7 kcal per gram.
Total kcal = protein×4 + carbs×4 + fat×9 + alcohol×7
Examples
- 30g carbs → 120 kcal
- 25g protein → 100 kcal
- 15g fat → 135 kcal
- 10g alcohol → 70 kcal
Macro tracking tips
- Most food labels already list protein, carbs, and fat grams.
- Fat calories rise quickly because fat has 9 kcal per gram.
- Oils, nuts, creamy sauces, and dressings can add calories fast.
FAQ
How many calories are in 1 gram of protein?
Protein has about 4 kcal per gram.
How many calories are in 1 gram of fat?
Fat has about 9 kcal per gram.
Can I use this for a full meal?
Yes if you know the macro grams for the meal or label. For mixed meals without labels, CaloriMate can estimate from photos or text.
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