Keto Meal Net Carbs Calculator
Work out the net carbs in a single keto meal from its total carbs, fiber and sugar alcohols, and see how much of your daily carb budget it uses.
How it works
Net carbs = total carbs − fiber − credited sugar alcohols · Budget share % = net ÷ daily budget × 100
On a ketogenic diet you count net carbs — the carbohydrate that actually raises blood sugar — rather than total carbs. Fiber is subtracted in full because it is not digested, and sugar alcohols are subtracted in full for erythritol and allulose (near-zero glycemic impact) or roughly by half for xylitol and maltitol, which are partly absorbed. Most keto plans cap net carbs around 20–30 g per day, so seeing a single meal as a share of that budget keeps the day on track.
Worked example
A meal with 20 g total carbs, 6 g fiber and 4 g erythritol has 20 − 6 − 4 = 10 g net carbs. Against a 25 g daily budget that is 40%, leaving 15 g for the rest of the day.
Frequently asked questions
Why subtract fiber and sugar alcohols?
Fiber passes through undigested and does not raise blood glucose, and most sugar alcohols are poorly absorbed. Net carbs isolate the digestible carbohydrate that actually affects ketosis, which is what a keto diet limits.
Should I subtract all sugar alcohols?
Not equally. Erythritol and allulose have essentially no blood-sugar impact and are subtracted fully. Maltitol and xylitol are partly absorbed, so a common rule is to subtract only half of them.
What daily net-carb limit keeps me in ketosis?
Most people reach and hold ketosis under about 20–30 g net carbs per day, but the exact threshold is individual. Start at 20 g and adjust based on how you feel and, if you test, on your ketone readings.
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Educational estimate for meal planning, not medical or nutrition advice. Serving thresholds and needs vary by person — check with a dietitian for medical diets.