How to Read Food Labels for Carb Counting
Now that you understand the basics of carb counting, your next step is to become a food label detective. The nutrition facts label is packed with information, but for carb counting, you only need to focus on a few key lines. This guide will show you exactly what to look for.

Step 1: Start with the Serving Size
At the very top of the label, you’ll find the **Serving Size** and the **Servings Per Container**. All the numbers on the label, including the carbohydrates, apply to a single serving. If you eat more than one serving, you need to multiply the carb count accordingly.
For example, if the serving size is 1 cup and you eat 2 cups, you’ll be getting double the carbs listed on the label.
Step 2: Find the Total Carbohydrate
This is the most important number for carb counting. The **Total Carbohydrate** line tells you the total amount of carbs, in grams, in one serving of the food. This includes all types of carbohydrates: sugar, starch, and fiber.
Step 3: Understand the Sub-Categories (Optional but Helpful)
Underneath Total Carbohydrate, you’ll see a few indented lines. These provide more detail about the types of carbs in the food:
- Dietary Fiber: Fiber is a type of carbohydrate that your body doesn’t digest. It doesn’t raise blood sugar levels and is very good for your health.
- Total Sugars: This includes both natural sugars (like those in fruit and milk) and added sugars.
- Added Sugars: These are sugars that have been added to the food during processing. It’s a good idea to limit your intake of added sugars.
Calculating Net Carbs: A Simple Approach
For most people, simply counting the **Total Carbohydrate** is sufficient for good blood sugar management. However, some people prefer to count “net carbs,” which is the amount of carbohydrate that directly affects blood sugar. The idea is to subtract the non-impact carbs (fiber) from the total.
Net Carb Formula: Total Carbohydrate (g) – Dietary Fiber (g) = Net Carbs (g)
For example, if a food has 20 grams of Total Carbohydrate and 5 grams of Dietary Fiber, the net carbs would be 15 grams.
Important Note: Always talk to your doctor or dietitian before you start using the net carb method, as it may require adjustments to your insulin-to-carb ratio.
Let’s Practice!
Imagine you’re looking at a label for a snack bar:
- Serving Size: 1 bar
- Total Carbohydrate: 25g
- Dietary Fiber: 7g
If you’re counting total carbs, you would count this as **25 grams**. If you’re counting net carbs, you would count it as **18 grams** (25 – 7 = 18).
Reading food labels becomes second nature with practice. Start by looking at the labels of foods you eat regularly. You’ll soon be able to quickly and confidently determine the carb content of any packaged food.

