Net Carbs Calculator
Calculate net carbohydrates by subtracting fiber and sugar alcohols - the carbs that actually raise blood glucose.
Educational estimator only - not medical advice.
Enter the total carbohydrates per serving as listed on the label.
Fiber is fully subtracted - it does not raise blood glucose.
Sugar alcohols are halved in the calculation - they have a partial blood glucose effect.
Enter your nutrition label values above to calculate net carbs.
Net carbohydrates represent the portion of total carbs that your body actually digests and converts to glucose. The standard formula is:
Why subtract fiber entirely? Dietary fiber passes through the digestive system largely undigested. It slows glucose absorption and has a negligible direct effect on blood sugar - so it's fully subtracted.
Why only halve sugar alcohols? Sugar alcohols (sorbitol, maltitol, xylitol, erythritol, etc.) are partially absorbed. They still raise blood glucose, just less so than regular sugar - approximately half the impact on average. Note: erythritol has almost no blood glucose effect, while maltitol has a relatively high impact.
Common misconceptions: "Zero net carbs" or "carb-free" marketing claims can be misleading. Sugar alcohols, especially maltitol found in many "diabetic" chocolates, still raise blood glucose significantly. Always check the specific sugar alcohol used.
Note: Some people with diabetes prefer to count total carbs rather than net carbs for more predictable dosing. Ask your care team what works best for you.
Chapter 7 of the FOD Starter Guide - The Plate Method: Simple Start - explains how to read nutrition labels, understand carbohydrate types, and use this knowledge to build a practical diabetes meal plan that works in real life.
FOD Starter Ch 7: The Plate MethodThis calculator is for educational and informational purposes only. Net carb calculations are estimates and individual responses to fiber and sugar alcohols vary. It is not a substitute for professional medical advice. Always consult your healthcare provider or a certified diabetes educator regarding your personal carbohydrate counting approach.