Net Carbs vs Total Carbs: Which Matters on Keto?

Net carbs vs total carbs — the difference decides whether you stay in ketosis. Learn the formula, when to use each, and which foods have the biggest gap.

Frequently Asked Questions

How do I calculate net carbs from a food label?
Take the total carbohydrates on the label, subtract dietary fiber, then subtract any sugar alcohols with a near-zero glycemic index (like erythritol or allulose). For xylitol or sorbitol, subtract half. For maltitol, count the full amount — it has a glycemic index of 52.
Are net carbs listed on nutrition labels?
No. The US FDA does not recognize "net carbs" as an official label claim. You calculate it yourself from the total carbohydrates, fiber, and sugar alcohol values on the Nutrition Facts panel.
How many net carbs per day on keto?
Most people maintain ketosis within 20 to 50 grams of net carbs per day. Starting at 20g is the most reliable way to enter ketosis. Once adapted, some people can stay ketogenic at up to 50g.
Do sugar alcohols count as net carbs on keto?
It depends on the type. Erythritol and allulose have zero glycemic impact and can be subtracted entirely. Maltitol should be counted in full. Xylitol and sorbitol are typically subtracted at 50 percent.
Should people with diabetes count net carbs or total carbs?
Most people with Type 2 diabetes use net carbs successfully for low-carb eating. Those with Type 1 diabetes should consult their endocrinologist, as fiber may still affect insulin dosing calculations in some clinical protocols.
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