Blood sugar and diabetes · United States
How do I read a food label for carbohydrate with diabetes?
Suppose you plan to eat 45 g from a packet whose label uses a 30 g serving. How much carbohydrate will that portion contain? Work through one complete example, then repeat it with your own label.
Short answer
Find the serving size and total carbohydrate in grams. Multiply by the number of label servings you actually eat. Use that amount with your personal meal plan; the label serving is not a recommended portion.
For everyday eating with type 2 diabetes or prediabetes. If your blood sugar is low, follow your existing treatment plan immediately.
Set up your label calculation
- Does the label describe one serving, the entire container, or both?
- How much of the package will you eat?
- Does the carbohydrate amount fit your agreed meal plan and the other foods in this meal?
Read the basis, calculate, then record
Find the serving weight and total carbs
Look at serving size and servings per container. FDA explains that a label serving describes a typical amount, not how much you should eat.
Guidance sources: FDA [1]
Convert your portion into label servings
Assume an example label shows 18 g total carbohydrate per 30 g of food. Eating 45 g is 45 ÷ 30 = 1.5 servings, so the amount contains 18 × 1.5 = 27 g carbohydrate.
Include the result in your meal
Include other carbohydrate foods and drinks in the meal. CDC says personal carbohydrate needs vary. This calculation is not an insulin-dose instruction or a universal meal target.
Guidance sources: CDC [2]
Continue reading: How can I plan meals with prediabetes? · Can I drink fruit juice with diabetes?
One label, three amounts you might measure
Assume 18 g carbohydrate per 30 g of food. Compare half, one and one-and-a-half servings; use your own packet for real values.
| Amount eaten | Label servings | Total carbohydrate |
|---|---|---|
| 15 g food | 15 ÷ 30 = 0.5 | 18 × 0.5 = 9 g Guidance sources: FDA [1] |
| 30 g food | 30 ÷ 30 = 1 | 18 × 1 = 18 g Guidance sources: FDA [1] |
| 45 g food | 45 ÷ 30 = 1.5 | 18 × 1.5 = 27 g Guidance sources: FDA [1] |
These are assumed values, not tested product data, suggested portions or personal carbohydrate targets. Use the actual label on your package.
Common label-reading questions
Do I add sugar grams to total carbohydrate?
Use total carbohydrate as the starting figure for carb counting. Do not add sugars again. FDA also explains that added sugars are already included in total sugars.
Does no added sugar mean no carbohydrate?
No. Foods can contain naturally occurring sugars and starch. Check the total-carbohydrate line and the amount you eat rather than relying on the front-label claim.
Who this guidance is for and further context
Daily meal planning has individual limits
These are daily food guides for type 2 diabetes or prediabetes. Type 1 diabetes, pregnancy, kidney disease and insulin use may require a different plan. They do not set a carbohydrate target or medicine dose for you.
Guidance sources: NIH NIDDK [4]
Low blood sugar is a different situation
If your blood sugar is low, follow your prescribed low-glucose treatment plan immediately. Advice to limit juice or added sugar at everyday meals must not delay treatment. See the CDC treatment guidance below.
Guidance sources: CDC [5]
Background and other choices
What matters for packaged-food labels
- Sugars are only part of carbohydrate; starch-containing foods still need a carbohydrate check.
- Added sugars are included in total sugars. Do not add them a second time.
- The carbohydrate amount that fits a meal differs between people.
Practical next steps
- Use a weight, volume or piece count that matches the label units.
- Compare two products using the same amount, rather than different serving sizes.
- Ask your diabetes educator how to use this calculation in your own plan.
When to speak with your clinician
Ask your care team about carbohydrate targets, repeated high or low readings, and meal timing with medicines. Do not skip meals or change diabetes medicines based on these food guides.
Browse by food
carbohydrate on packaged-food labels · All foods →Sources and editorial context
The food advice and preparation steps draw on the references below. Follow the links if you would like to read the original guidance in full.
What changed · Reframed around a 45 g portion, with task-specific headings and a checklist for repeating the worked calculation.
Can I Eat Editorial Team. Published for readers in United States. Content last updated 2026-10-08.
Try it with the label in your hand
Use Can I Eat to read the visible nutrition label. Confirm the serving basis and total carbohydrate on the packet before applying your portion calculation.
General food information, not a diagnosis, glucose prediction or medication plan. Individual advice takes priority.