Counting carbs on keto? This free net carb calculator subtracts fiber and sugar alcohols from total carbs to show the digestible carbs that count toward your daily limit.
From the nutrition label
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Net carbs are the carbs your body digests for energy. Fiber and most sugar alcohols pass through with little blood-sugar impact, so they’re subtracted from total carbs.
Net carbs
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Enter total carbs
Total carbs
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Fiber subtracted
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Sugar alcohols subtracted
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Net carb calories
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A guide for low-carb and keto eating. Practices vary — some count all sugar alcohols, others half (erythritol is often fully subtracted). Use whichever your plan follows, and check with a professional for medical conditions like diabetes.
Use this free net carb calculator to work out the net carbs in a food. Enter the total carbs, fiber and any sugar alcohols from the label, and it subtracts them to show your digestible carbs.
What this net carb calculator shows you
A net carb calculator finds the carbs your body actually digests for energy. Net carbs equal total carbohydrate minus fiber minus sugar alcohols, since fiber and most sugar alcohols pass through with little blood-sugar impact. It’s a key number for low-carb and keto eating.
How net carbs are calculated
Net carbs = total carbs − fiber − sugar alcohols
A food with 30 g total carbs, 8 g fiber and 6 g sugar alcohols has about 16 g net carbs (or 19 g if you only subtract half the sugar alcohols).
Why fiber and sugar alcohols are subtracted
Fiber isn’t digested for energy, so it’s fully subtracted.
Sugar alcohols (like erythritol, xylitol) have little blood-sugar effect; erythritol is often subtracted fully, others sometimes only half.
The rest — starches and sugars — are the carbs that count toward your net total.
Net carbs vs total carbs
Total carbs is everything on the label; net carbs removes the parts with minimal metabolic impact. Low-carb and keto plans usually track net carbs, while some people — and some food regulators — prefer total carbs for simplicity.
How to use the net carb calculator
Enter the total carbohydrate from the label.
Enter the fiber and any sugar alcohols.
Choose how to count sugar alcohols (all or half).
Read your net carbs.
Net Carb FAQ
How do I calculate net carbs?
Subtract fiber and sugar alcohols from total carbohydrates. For example, 30 g total carbs minus 8 g fiber and 6 g sugar alcohols equals about 16 g net carbs.
What are net carbs?
Net carbs are the carbohydrates your body digests and uses for energy. Because fiber and most sugar alcohols have little effect on blood sugar, they’re usually subtracted from total carbohydrates.
Do I subtract all sugar alcohols?
Not always. Erythritol is commonly subtracted in full, while other sugar alcohols are sometimes counted partially because they can have a greater impact on blood sugar. This calculator lets you choose your preferred method.
What’s the difference between net carbs and total carbs?
Total carbs include all carbohydrates listed on a nutrition label. Net carbs subtract fiber and, depending on the method used, some or all sugar alcohols. Many low-carb and keto diets focus on net carbs rather than total carbs.
Should people with diabetes use net carbs?
Diabetes carbohydrate counting can vary, and individuals may respond differently to fiber and sugar alcohols. Follow the guidance of your doctor, diabetes educator or dietitian rather than relying solely on a general formula.
Is the net carb calculator free to use?
Yes, this net carb calculator is completely free, requires no sign-up, and provides instant results directly in your browser. It is intended for informational purposes only and is not medical advice.
