About this tool
Convert macronutrient grams into total calories. Useful for verifying food labels and planning meals.
Formula
kcal = protein·4 + carbs·4 + fat·9 + alcohol·7
Worked example
100 g P + 200 g C + 70 g F → 400 + 800 + 630 = 1,830 kcal
Notes
These are Atwater factors — a slight simplification. Fiber is typically excluded from carb calories (or counted as 2 kcal/g).