Net Carbs Calculator
Calculate net carbs: total carbohydrates minus fiber and sugar alcohols. Net carbs represent the carbs that significantly impact blood sugar. For keto, aim for 20-50g net carbs per day.
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Key values and context for this tool: • Formula: Total − Fiber − SA • Keto Target: 20-50g/day • Blood Sugar Impact: Net Only
Ready to run the numbers?
Why: Calculate net carbs for keto and diabetes management.
How: Enter your values in the calculator fields below, keep units consistent, then run the calculation to see results and any step-by-step work shown on this page.
Run the calculator when you are ready.
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For informational purposes only — not medical advice. Consult a healthcare professional before acting on results.
Net carbs = Total carbohydrates minus fiber and sugar alcohols. They represent the carbs that significantly impact blood sugar. For keto, aim for 20-50g net carbs per day. US/Canada labels include fiber in total carbs; EU/UK often list available carbs separately. Sugar alcohol deduction varies by type: erythritol 100%, xylitol 75%, maltitol 25%.
Key Takeaways
- • Net carbs = Total − Fiber − Sugar Alcohols (type-adjusted).
- • Keto target: 20-50g net carbs per day for most people.
- • Erythritol has minimal impact; maltitol has moderate impact.
- • Regional labels differ — US/Canada vs EU/UK calculation methods.
Did You Know?
How Does Net Carbs Work?
1. Read the Label
Find Total Carbohydrates, Dietary Fiber, and Sugar Alcohols (or Polyols) on the nutrition facts.
2. Subtract Fiber
Fiber is fully subtracted (US/Canada). It doesn't raise blood sugar significantly.
3. Subtract Sugar Alcohols
Apply type-specific rates: erythritol 100%, xylitol 75%, maltitol 25%, sorbitol 70%.
Expert Tips
Sugar Alcohol Deduction Rates
| Type | Deduction | Blood Sugar Impact |
|---|---|---|
| Erythritol | 100% | Minimal |
| Xylitol | 75% | Low |
| Maltitol | 25% | Moderate |
| Mixed | 50% | Conservative |
Frequently Asked Questions
What are net carbs?
Net carbs = Total carbohydrates minus dietary fiber and sugar alcohols. They represent the carbs that significantly impact blood sugar. Formula: Net Carbs = Total − Fiber − Sugar Alcohols (adjusted by type).
How is this calculated?
For US/Canada labels: subtract fiber and sugar alcohols from total carbs. Sugar alcohol deduction varies: erythritol 100%, xylitol 75%, maltitol 25%. EU/UK labels often list available carbs separately.
What is the keto net carb target?
For ketosis, aim for 20-50g net carbs per day. Most people enter ketosis below 50g; strict keto targets 20-25g. Individual tolerance varies.
Do sugar alcohols count as net carbs?
Partially. Erythritol has minimal impact (subtract 100%). Maltitol has moderate impact (subtract ~25%). Xylitol and sorbitol fall in between. Our calculator applies type-specific deductions.
Why use net carbs instead of total carbs?
Fiber and many sugar alcohols pass through the digestive system with minimal blood sugar impact. Net carbs give a more accurate picture for diabetes management and keto adherence.
Can this replace medical advice?
No. This tool is for educational purposes. Diabetics should work with a healthcare provider for insulin dosing and meal planning. Not a substitute for professional medical consultation.
Key Statistics
Official Data Sources
⚠️ Disclaimer: This calculator is for educational purposes only. It is not a substitute for professional medical or nutrition advice. Diabetics should consult a healthcare provider for insulin dosing. Individual responses to sugar alcohols vary.
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