On the keto diet, net carbs are the total grams of carbs in a food minus grams of fiber and sugar alcohols.
Fiber is a type of carbs that your body cannot digest, therefore it should be subtracted from the total carbs.
Sugar alcohols are sweeteners that have much less effect on blood sugar levels and are almost not absorbed by the body. Therefore, they are subtracted from the total amount of carbs when calculating net carbs.
So, Net Carbs = Total Carbs – Fiber – Sugar Alcohols.
If sugar alcohols are in the product, they are usually indicated on the package as a subcategory of carbohydrates. They can be called "Sugar alcohols", "Polyols", or bear the name of a specific sweetener (mannitol, erythritol, sorbitol, isomalt, lactitol, xylitol, and maltitol).
Please note that in the United Kingdom, Australia, and New Zealand carbohydrates on food packages are already indicated minus fiber and you do not need to subtract it again.
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