Enter the carbohydrate grams and total food weight into the calculator to determine the carbohydrate percentage by weight.

Carbohydrate Calculators

Carb % by weight Net Carbs Glycemic Load

Enter any 2 values to calculate the missing variable. This is percent by weight (not % of calories).

Tip: Use carbohydrate grams from a nutrition label when possible (not the food’s serving weight).

Important: These calculators are for educational use only and are not medical advice. Do not use them to dose insulin or change diabetes medications; if you have diabetes, are pregnant, have kidney disease, an eating disorder, or other medical conditions, follow your clinician’s guidance. “Net carbs” methods (including sugar alcohol factors) are non-standard and vary by product and person, and GI/GL values can vary by food type and preparation—use trusted nutrition labeling and reputable GI references when available.

Related Calculators

Carb Percentage by Weight Formula

The following formula is used to calculate the carbohydrate percentage by weight for a given amount of food (this is not percent of calories from carbohydrates).

P = (C / T) * 100

Variables:

  • P is the carbohydrates percentage
  • C is the carbohydrates in grams
  • T is the total food weight in grams

To calculate the carbohydrate percentage by weight, divide the carbohydrates by the total food weight and multiply the result by 100 to get the percentage.

What is Carbohydrates Percentage?

The carbohydrates percentage (as used on this page) is a measure of the proportion of carbohydrates in a given amount of food by weight. It is expressed as a percentage and indicates how much of the food's weight is made up of carbohydrates. Note that “carb percentage” is sometimes used to mean percent of calories from carbohydrates; that is different from the weight-based calculation used here.

How to Calculate Carbohydrates Percentage?

The following steps outline how to calculate the Carbohydrates Percentage.

  1. First, determine the amount of carbohydrates in grams (C).
  2. Next, determine the total weight of the food in grams (T).
  3. Next, calculate the carbohydrates percentage using the formula P = (C / T) * 100.
  4. Finally, calculate the Carbohydrates Percentage.
  5. After inserting the values and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

Carbohydrates (C) = 50 grams

Total Food (T) = 200 grams