Always count and track your total carbohydrates rather than subtracting fiber from your carbs.
Contrary to popular belief, most fiber can be broken down by gut bacteria and will contribute calories. The types which can be broken down and how many calories they contribute is based on many factors, including the amount and species of bacteria you harbor and the way your food was prepared.
So, while there may potentially be slightly fewer calories and carbs in certain fiber and sugar-free products, this isn’t always the case, and attempting to factor in fiber, sugar alcohols, and other components companies use to push “net carbs” can become one big math equation that is susceptible to a whole lot of error.
Stick to tracking total carbohydrates and let those figures dictate your progress. Consistency and simplicity reign supreme when making outcome-based decisions!