Grams to Calories Calculator

This converter turns grams of a macronutrient into the calories they carry, using the factors behind the calorie line on a nutrition label: 4 for protein and carbohydrate, 9 for fat, 7 for alcohol and 2 for fibre. Enter the grams from a label or a recipe and it returns the calories from each one, the total in kilocalories and kilojoules, and how the total splits between them. A second tab runs the other way and turns a calorie figure into grams of a single nutrient. It asks whether your carbohydrate figure already includes the fibre, because US and European labels differ on that and counting it twice is the usual mistake.