Subtract fiber and sugar alcohols from total carbs to find the net carbs used for keto tracking.
Total Carbs (g) — Value for total carbs in g. Provide accurate numbers for a reliable Net Carbs. Example: 20 g.
Fiber (g) — Value for fiber in g. Provide accurate numbers for a reliable Net Carbs. Example: 6 g.
Sugar Alcohols (g) — Value for sugar alcohols in g. Provide accurate numbers for a reliable Net Carbs. Example: 2 g.
Net Carbs
12.0 g
Net Carbs — Calculated outcome g. Derived from your inputs via the displayed formula; use to plan.
Subtracted (Fiber + Sugar Alcohols)
8.0 g
Subtracted (Fiber + Sugar Alcohols) — Calculated outcome g. Derived from your inputs via the displayed formula; use to plan.
What this means
Fiber is indigestible and sugar alcohols are partially absorbed, so they are subtracted from total carbs. Net carbs are floored at zero.
On keto, many people track net carbs rather than total carbs. Net carbs equal total carbs minus fiber and sugar alcohols, which are not fully absorbed.
Formula
net carbs = total carbs − fiber − sugar alcohols
Worked examples
FAQ
Is the net carb method universally accepted?
It is common in keto communities, but different dietitians and countries treat sugar alcohols and fiber differently — confirm your preference.
Why would net carbs go negative?
If fiber plus sugar alcohols exceed total carbs, the result is clamped to zero since you cannot have negative carbs.