Net Carbs from Label Calculator

How it is calculated

Take the values from the label in grams per serving: net carbs = total carbs − fiber − (sugar alcohols ÷ 2). The tool deducts all of the fiber and exactly half of the sugar alcohols, one rule for every type. Total carbs and fiber are required; the sugar alcohol box is optional and an empty one counts as 0. Because fiber and sugar alcohols are parts of the total on a label, a fiber or sugar alcohol figure larger than the total carbs, or any negative value, shows no result. If the two deductions together exceed the total, the net is shown as 0.00 g. Net carbs is a community convention, not a regulated label term, and sugar alcohols are absorbed differently from one another, so the half rule is an estimate.

Common mistakes

• Entering values from the 100 g column when you eat a different portion, or mixing a per-100 g total with per-serving fiber. All three numbers must come from the same column.
• Expecting every sugar alcohol to be removed in full. Here exactly half is deducted, so the result is higher than a calculation that subtracts them all.
• Entering a fiber figure larger than the total carbs by mistake, for example 25 g fiber against 22 g total. The tool refuses it and shows nothing, so check the label again.
• Entering the grams of sugar alcohols after they have already been halved. The tool halves them itself, so enter the label figure.
• Logging the net figure in a tracker that counts total carbs, or reading it as an exact blood sugar effect. Individual response to sugar alcohols and fiber varies.