It is quite simply subtracting the fibre and sugar alcohols from the total carbohydrates. For us Aussies net carbs are calculated on all Australian nutritional panels.
- Unlike other carbohydrates fibre cannot be digested by the body and passes through the intestinal tract pretty much intact. This is why we do not calculate fibre into our diet.
- Sugar alcohols are sweeteners like xylitol and erythritol. Sugar alcohols taste sweet, and are either only partially digested or not at all.
To reach ketosis and stay there it is recommended to stay under 20-30g of net carbs. This can differ for some of us, so you can test and trial your limits. As a rule I personally just stick to under the 20g net carbs and maintain ketosis.