Net Carbs
Calculate net carbohydrates by subtracting fiber and sugar alcohols from total carbs. Free net carbs calculator for keto, low-carb, and diabetes-friendly meal planning.
About This Calculator
The Net Carbs Calculator helps you determine the digestible carbohydrate content in your food by subtracting fiber and sugar alcohols from total carbohydrates. Net carbs, also known as digestible or impact carbs, are the carbohydrates your body actually breaks down and absorbs — making them the most relevant measure for blood sugar management, ketogenic diets, and low-carb meal planning.
The calculation follows established nutritional guidelines: Net Carbs = Total Carbohydrates − Fiber − (Sugar Alcohol ÷ 2). In the USA and Canada, food labels include fiber in the total carbohydrate value, requiring manual subtraction. In other countries like the UK, Australia, and India, fiber is already deducted from the carbohydrate line on nutrition labels. Sugar alcohols are halved because they are only partially digested — though some varieties like erythritol, xylitol, mannitol, and lactitol pass through undigested and count as zero.
Regional Notes
India (IN): Indian food labels follow the Codex Alimentarius standard where dietary fiber is listed separately and not included in the "Carbohydrates" value. Net carbs equal the carbohydrates value plus half of any sugar alcohol content.
United States (US): FDA regulations require fiber to be included in the "Total Carbohydrate" line on Nutrition Facts labels. Always subtract dietary fiber from total carbs to get net carbs.
United Kingdom (UK): UK and EU nutrition labels show "Carbohydrates" with fiber already excluded and listed separately under "Fibre." Net carbs equal the displayed carbohydrate value plus half of any polyols (sugar alcohols).
At just 4 calories per gram, net carbs are the primary fuel source for your body. Tracking them is especially valuable for individuals on ketogenic diets (typically 20–50g net carbs daily), those managing diabetes, or anyone focused on metabolic health.
Frequently Asked Questions
How do I calculate net carbs?
To calculate net carbs, subtract fiber and half the sugar alcohol content from total carbohydrates. For US and Canadian food labels, fiber is included in total carbs so you must subtract it. For other countries, fiber is already deducted from the total carbohydrate value on the label.
What are net carbs vs total carbs?
Net carbs are the carbohydrates that your body actually digests and absorbs, affecting blood sugar levels. Total carbs include all carbohydrates — digestible starches and sugars, plus indigestible fiber and sugar alcohols. Net carbs equal total carbs minus fiber minus half of sugar alcohols.
How many net carbs should I eat per day on keto?
On a ketogenic diet, the recommended limit is typically 20 to 50 grams of net carbs per day to achieve and maintain ketosis. Individual tolerance varies — some people can stay in ketosis at higher intakes while others need stricter limits. Consult your healthcare provider before starting a keto diet.
Do all sugar alcohols count toward net carbs?
No. Erythritol, xylitol, mannitol, and lactitol are not digested and do not count toward net carbs. Other sugar alcohols like maltitol, sorbitol, and isomalt are partially digested, so only half of their weight is counted. Our calculator automatically handles this by dividing total sugar alcohol by 2.
Why does the country I live in matter for net carb calculation?
In the USA and Canada, food labels include fiber in the total carbohydrate value, so you must subtract fiber to get net carbs. In Australia, New Zealand, the UK, and most other countries, fiber is already subtracted from the carbohydrate value on the label. Our calculator adjusts the formula based on your selected region.
How many calories do net carbs provide?
Each gram of net carbs provides 4 calories. This is the same energy density as digestible carbohydrates and proteins. Our calculator automatically computes the calories from net carbs based on the total net carb content across all servings.
Is the net carbs calculator free to use?
Yes, this net carbs calculator is completely free to use with no registration or account required. You can share your results via the URL, which saves your input values for easy sharing.
Can I use this calculator for a low-carb or diabetes diet?
Yes, the net carbs calculator is useful for anyone following a low-carb diet, ketogenic diet, or managing diabetes. Net carbs directly impact blood glucose levels, making this a valuable tool for meal planning. Always consult your healthcare provider for personalized dietary advice.