Guides
How the numbers work.
A food label gives you carbs for 100 g or for one serving. These guides show how to turn that into the carbs in the amount you actually eat, one worked example at a time.
How to calculate carbs from a food label
Find the total carbohydrate line, check what amount the number describes, and work out the carbs in your own portion, with worked examples.
Read the guideCarbs per 100 g vs per serving
What the two label columns mean, where each convention comes from, how to convert between them, and the mistakes that throw the sum out.
Read the guide Home cookingHow to calculate carbs in homemade meals
Add up the carbs in each ingredient, then share the total by equal portions or by weighing the finished dish. A worked example and the limits.
Read the guideTry it on your food
Got a label in front of you?
Type in the carbs per 100 g and how much you're having. The calculator shows the answer and every step.
Work out my portionDoing this every day? The Android app scans the label and keeps your usual foods.
See what the app does