Net Carbs Calculator
Reviewed by Hamza Gujjar, Algorithm Architect & Software Developer
Last updated: July 27, 2026Why "net carbs" is tracked separately
Low-carb and ketogenic diet tracking often subtracts fiber and half of sugar alcohols from total carbohydrate counts, on the reasoning that fiber passes through largely undigested and many sugar alcohols are only partially absorbed by the body.
Worked example
For a food with 30g total carbs, 8g fiber, and 4g sugar alcohols:
Net Carbs = 30 - 8 - (4 / 2) = 20 g
Frequently asked questions
Is "net carbs" an official nutrition term? No - it is a popular tracking convention, not a term recognized uniformly across all nutrition authorities or food labeling regulations, so treat it as a helpful estimate rather than a precisely standardized figure.
Do all sugar alcohols behave the same way? No - some, like erythritol, are largely unabsorbed and contribute close to zero net carbs, while others, like maltitol, are absorbed more significantly and affect blood sugar more than this general halving method accounts for. Check the specific sugar alcohol used when precision matters.