🍞 Grams to Calories Calculator

What this calculator does

This tool converts an amount of a macronutrient, measured in grams, into its equivalent food energy in calories (kilocalories), using the standard Atwater energy factors nutrition labels are based on.

How the calculation works

Each macronutrient provides a fixed amount of energy per gram: carbohydrates and protein each provide about 4 kilocalories per gram, fat provides about 9 kilocalories per gram, and alcohol provides about 7 kilocalories per gram. The calculator multiplies your entered grams by the selected factor.

This tool is intended for general nutrition planning and educational purposes, not as licensed dietary or medical advice.