Net Carb Calculator
Enter what is on the label. The calculator handles the US vs UK labelling difference and treats each sweetener properly.
How do you calculate net carbs? On a US label, subtract fibre and eligible sugar alcohols from total carbohydrate. On UK/EU labels, fibre is already excluded.
The rules applied
- US labels: net carbs = total carbs − fibre − counted sugar alcohols.
- UK/EU/AU labels: carbohydrate already excludes fibre, so only sugar alcohols are subtracted.
- Erythritol and allulose are subtracted fully; xylitol and sorbitol by half; maltitol not at all, because it raises blood sugar much more than other polyols.
The background to each rule is in net carbs vs total carbs.
Look up common foods
Our food database lists net carbs per 100 g and per typical serving for over 80 foods, based on USDA FoodData Central.
Frequently asked questions
How do you calculate net carbs?
On a US label, subtract fibre and eligible sugar alcohols from total carbohydrate. On UK/EU labels, fibre is already excluded.
Do you subtract all sugar alcohols?
No. Erythritol and allulose can be subtracted fully, xylitol and sorbitol partly, and maltitol should be counted.