Oat Fiber has zero net carbs. Oat fiber is an insoluble fiber where 100% of the carbs present are in the form of dietary fiber. Because you’re dealing with fiber, the entirety of the carbs present will go through the body undigested, and eventually passed through as body waste.
We find that that this can sometimes confuse bakers who are beginning to test out low-carb baking. If you’re ever having trouble with your net carbs (in oat fiber or elsewhere), you can remember this handy equation for calculating net carb counts of ingredients, recipes, or pre-packaged products:
Net Carbohydrates = Carbohydrates – Dietary Fiber – Sugar Alcohols or Allulose