One of the first things that confuses people on keto is carb counting. The food label says one number, a keto app says another, and "net carbs" shows up everywhere. Let's clear it up.

Total carbs

Total carbohydrate is the full number on the nutrition label. It includes everything: starches, sugars, fiber, and sugar alcohols — all of it.

Net carbs

Net carbs is total carbs minus the parts your body mostly doesn't absorb as regular carbohydrate — fiber and sugar alcohols. The formula:

Net carbs = Total carbs − Fiber − Sugar alcohols

For example, half a cup of raw broccoli has about 2.3 g of total carbs and 1.3 g of fiber, so its net carbs are about 1 g (American Diabetes Association).

The idea is that fiber and (most) sugar alcohols pass through without raising blood sugar much or giving you usable energy, so people on keto subtract them.

The honest caveats (read this part)

Most keto blogs stop at the formula. But there are real catches worth knowing:

  • "Net carbs" has no official definition. It is not used by the U.S. Food and Drug Administration and is not recognized by the American Diabetes Association (ADA). It's a popular concept, not a regulated term.
  • Not all fiber and sugar alcohols are "free." Some are partly digested and do provide calories and do affect blood sugar. Maltitol, a common sugar alcohol in "keto" and "sugar-free" products, is a frequent offender.
  • So the net-carb number can be too optimistic — especially for processed "low-carb" packaged foods that lean on sugar alcohols.

What to actually do

  • Beginners: counting total carbs is simpler and safer. If you stay under your limit on total carbs, you're definitely under it on net carbs too.
  • Whole foods make this easy: with vegetables, meat, eggs, and nuts, the difference between net and total is small and honest.
  • Be skeptical of "keto" packaged products advertising very low net carbs — check the sugar alcohols.
  • If you have diabetes, the ADA recommends counting total carbs and watching how high-fiber or sugar-alcohol foods actually affect your blood glucose (ADA). Talk to your care team.

Remember the keto target: most people stay in ketosis under about 20–50 g of carbs per day (Cleveland Clinic). Whether you track that as total or net carbs, pick one method and be consistent.

Next, see what to eat on keto and the signs you've reached ketosis.

Sources