Net Carb Calculator
Calculate the net carbs in any food by subtracting fiber and sugar alcohols.
Net carb tracking is informational and does not replace medical or dietetic advice.
Net carb calculator
Enter label values and choose how sugar alcohols should be handled.
Some people subtract all fiber; sugar alcohol handling varies by ingredient and tracking method.
Food item 1
Use values from the nutrition label when available.
Food item 2
Use values from the nutrition label when available.
Calculated net carbs
4.5 g
Based on entered label values using: Subtract fiber + half sugar alcohols.
Total carbs
15.0 g
Fiber subtracted
10.5 g
Sugar alcohol adjustment
0.0 g
Net carbs / serving
2.3 g
Uses standard net carb calculation methods. Reviewed for accuracy. Calculation method may vary. Does not replace medical, dietetic, or professional nutrition advice.
Personalized interpretation
Based on your inputs, this selection has approximately 4.5 g net carbs.
This calculation subtracts 10.5 g fiber and 0.0 g sugar alcohol adjustment from total carbs.
If your label already excludes fiber from carbohydrate, do not subtract fiber again.
Net carbs can be useful for keto or low-carb tracking, but it is not required for everyone. People with diabetes or medical conditions should use professional guidance for carbohydrate tracking.
What net carbs mean
Net carbs vs total carbs
Total carbs
Total carbs include all carbohydrate listed on the nutrition label and are usually the official label value.
Net carbs
Net carbs subtract selected components such as fiber and are a tracking convention used by some diets and products.
Fiber and sugar alcohols explained
Fiber is a carbohydrate that is not fully digested like starch or sugar. Some tracking methods subtract fiber from total carbs.
Sugar alcohols vary in digestion and blood glucose effect. Erythritol, xylitol, sorbitol, maltitol, and others may behave differently.
Some people subtract all sugar alcohols, some subtract half, and some use total carbs. Consistency matters when tracking.
Food label differences by country
U.S. and Canadian labels often include fiber under total carbohydrate. In that format, subtracting fiber may align with common net carb tracking methods.
Some UK and EU labels list “carbohydrate” excluding fiber, with fiber listed separately. Subtracting fiber again can undercount carbs.
Understand your label format before calculating.
Using net carbs for keto or low-carb planning
Formula explanation
Net Carbs = Total Carbs − FiberNet Carbs = Total Carbs − Fiber − Sugar Alcohol AdjustmentHalf Sugar Alcohol Method = Total Carbs − Fiber − (Sugar Alcohols × 0.5)Net Carbs Per Serving = Net Carbs ÷ ServingsExample 1
Total carbs 20 g, fiber 8 g, sugar alcohols 0 g: net carbs = 20 − 8 = 12 g.
Example 2
Total carbs 24 g, fiber 6 g, sugar alcohols 10 g, half method: 24 − 6 − 5 = 13 g.
Label caution
If fiber is already excluded from the carb value on the label, do not subtract it again.
Frequently Asked Questions
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