What Are Net Carbs? How to Calculate Digestible Carbs

Net carbs are the carbohydrates in a food that the body can digest and use for energy. The number is calculated by subtracting the grams of fiber and certain sugar alcohols from a food’s total carbohydrate count.

What Net Carbs means

Net carbs are a measure of the carbohydrates that are absorbed by the body and affect blood sugar levels. The concept is based on the idea that not all carbohydrates are created equal. While some carbs, like sugars and starches, are broken down into glucose for energy, others, like dietary fiber, pass through the digestive system largely intact. The calculation is straightforward: Total Carbohydrates minus Dietary Fiber minus certain Sugar Alcohols equals Net Carbs. This figure is not an official, government-regulated term but a concept used primarily for marketing and by followers of specific diets.

The focus on net carbs became popular with the rise of low-carbohydrate and ketogenic diets. The goal of these eating patterns is to limit carbohydrate intake to encourage the body to use fat for fuel, a state known as ketosis. By tracking net carbs instead of total carbs, people on these diets can more easily include high-fiber foods, such as non-starchy vegetables, avocados, nuts, and seeds. These foods might be higher in total carbs, but because much of that is indigestible fiber, their impact on blood sugar is lower, making them compatible with a low-carb lifestyle.

In practice, people use the net carb count to make food choices that fit within their daily carbohydrate allowance. Many food manufacturers, especially those creating products for the low-carb market, display the net carb count prominently on their packaging. However, this requires consumers to be vigilant label readers. Understanding how to calculate it yourself is useful, as it provides a tool for managing a specific dietary approach. It is not, however, a universal indicator of a food’s overall healthfulness, as a food could be low in net carbs but high in sodium or saturated fat.

There are limitations to the net carb concept. Because the term is not regulated by the FDA, companies may use different methods to calculate it, particularly concerning sugar alcohols. Some sugar alcohols are partially absorbed and can still affect blood sugar and cause digestive discomfort in some people. A narrow focus on minimizing net carbs could also lead someone to overlook the broader nutritional profile of their food, potentially missing out on essential vitamins and minerals from fruits and whole grains that are higher in total carbohydrates.

How to Calculate Net Carbs

1. Find the Nutrition Facts label on the food’s packaging.
2. Locate the ‘Total Carbohydrate’ line and note the number of grams.
3. Directly below that, find the ‘Dietary Fiber’ line and note its gram amount.
4. If the product contains them, look for sugar alcohols (like erythritol, xylitol, or sorbitol), which are sometimes listed separately under total carbohydrates.
5. Subtract the grams of fiber from the grams of total carbohydrate. If sugar alcohols are present, subtract their grams as well.
6. The result is the estimated number of net carbs per serving.

Net Carbs vs. similar terms

Common misconceptions

• Myth: Net carbs have zero impact on blood sugar. While they generally have a smaller impact than other carbohydrates, the digestible carbs that make up the ‘net’ number are still absorbed and can raise blood sugar. The effect varies based on the food and the individual.
• Myth: If a food is low in net carbs, it must be healthy. A low net carb count doesn’t automatically make a food nutritious. Highly processed snacks can be low in net carbs but also low in vitamins and minerals or high in sodium and unhealthy fats.
• Myth: The term ‘net carbs’ is officially regulated by the FDA. The FDA does not officially define or regulate ‘net carbs.’ Companies use it as a marketing term, and their calculation methods can differ, especially in how they account for various sugar alcohols.

Related terms

• Fiber
• Macros
• Glycemic Index
• Complex Carbs
• Refined Carbs
• Blood Sugar Spike

How this entry was made: drafted with AI assistance from general, widely published definitions, checked in a separate verification pass for invented numbers and claims, and edited by the Millennials Wellness editors. General information only, not medical, financial or legal advice. Last checked October 2026. Our ground rules · Back to the glossary