Why half sugar alcohols?
Many sugar alcohols contribute partial carbs; 50% is a common keto shortcut.
Net Carbs Calculator
Subtract fiber and half of sugar alcohols from total carbs to estimate net carbs.
Net carbs
Enter total carbohydrates, fiber, and sugar alcohols from a label.
About this calculator
How to use Net Carbs Calculator, plus the formulas and logic behind the results.
Tool description
Low-carb and keto diets often track net carbs—total carbs minus fiber and part of sugar alcohols that are not fully absorbed.
How to use
- Read total carbs, fiber, and sugar alcohols on the label.
- Enter all three (zero if absent).
- Calculate net carbs per serving.
- Fit the result into your daily carb budget.
Formulas & reference
Net carbs = total carbs − fiber − (sugar alcohols × 0.5)Minimum 0 g
Label tips
- Fiber is listed under carbohydrates on US labels
- Sugar alcohols include sorbitol, maltitol, xylitol, etc.
- Some EU labels show carbs differently
Calculation logic
Fiber is subtracted fully; sugar alcohols count at 50% unless you know a specific sweetener behaves differently.
Erythritol is often counted as 0 net by keto dieters; this tool uses the common half-count rule for all sugar alcohols.
Net Carbs Calculator FAQ
Common questions about this calculator and how to use the results.
Erythritol?
Often treated as 0 net carbs; this generic tool still applies 50% unless you adjust manually.
Total vs net on keto?
Keto limits usually refer to net carbs, not total carbs.
Vegetables?
Use label or database entries; whole foods still have fiber to subtract.
Negative net carbs?
Result floors at zero—check entries if fiber exceeds total carbs.
Diabetes?
Carb counting for insulin may use total carbs—follow your diabetes care plan.