Comprehensive Calculator Guide
Net carbs are the carbohydrates the body digests into sugar, found by subtracting fibre and sugar alcohols from total carbs. Keto and low-carb dieters use them to track their daily allowance. A food with 30 g of carbs and 12 g of fibre has 18 g of net carbs. Take the numbers from the nutrition label.
What is subtracted, and why
Fibre is not digested in the small intestine, so it does not raise blood sugar in the same way. Sugar alcohols such as erythritol are only partly absorbed, varying by type; some sources subtract them fully, others half, and this calculator subtracts them fully.
“Net carbs” is not an official labelling term, so companies calculate it differently. People with diabetes should plan with their doctor or dietitian.
How to Use
- 01Enter total carbohydrates.
- 02Enter fibre and any sugar alcohols.
- 03Read net carbs.
Formula Used
Net carbs = total − fibre − sugar alcoholsPractical Examples
Example 1
30 g total, 12 g fibre: 18 g net.
Example 2
25 g total, 5 g fibre, 10 g sugar alcohols: 10 g net.
Important Tips
- Check the serving size on the label.
Common Mistakes to Avoid
- Subtracting fibre twice when the label already shows net carbs.
Frequently Asked Questions
- How do I calculate net carbs?
- Total carbs minus fibre and sugar alcohols.
- Is net carbs an official term?
- No, so methods vary.
- Do I subtract all sugar alcohols?
- Sources differ; this tool subtracts them fully.