Updated 13 October 2026: This article has been reviewed and revised for clarity and label-reading accuracy.
A food label becomes easier to use when you begin with a question. You might want to know the amount of sodium in the whole container, whether two snacks have comparable serving sizes, or how much added sugar is included in one serving. Those questions require different parts of the label. Reading every line without a purpose can leave the main comparison unresolved.
This checklist is for U.S. Nutrition Facts labels. Its examples are invented for practice; they are not descriptions of a particular brand or recommendations about what you should eat.
First, identify what the numbers describe
Find the serving size, the servings per container, and the heading above each column. According to the FDA’s serving-size guide, the serving size represents typical consumption used for labeling, not a personal portion recommendation. Some packages show separate values for a serving and the entire container. Choose the column that answers your question.
For example, imagine a package with two servings. Its label lists 180 calories per serving and 360 per package. If your question concerns the whole package, 360 already answers it. Multiplying the package column by two would count the container twice. Write “per serving” or “per package” beside a copied number so that its meaning survives after you put the food down.
Match the question to the right row
| Your question | Where to look | What to record |
|---|---|---|
| What amount does this describe? | Serving information and column headings | The amount and its unit |
| How much sodium is in it? | Sodium row | Milligrams and the relevant portion |
| How much added sugar is listed? | Added Sugars row | Grams, without adding them to Total Sugars again |
| How does one nutrient compare? | That nutrient on both products | Values for equal amounts of food |
The FDA’s label explanation distinguishes total sugars from added sugars: the added amount is already part of the total. In an invented example with 12 grams of total sugars and 5 grams of added sugars, adding the two would incorrectly produce 17 grams. The label describes overlapping categories, not two separate quantities to combine.
Use % Daily Value as context
The FDA’s % Daily Value guide explains how a nutrient amount relates to a daily reference. Its quick guide treats 5% DV or less as low and 20% DV or more as high for an individual nutrient per serving. The percentages are not an overall quality score for the product, and they are not percentages of the package’s weight.
Suppose one food shows 4% DV for sodium and 20% DV for calcium. Adding those entries to get 24% does not describe a useful total. They refer to different nutrients with different reference amounts. Instead, record two separate observations: this serving contributes relatively little sodium and relatively much calcium under that labeling guide. Neither observation answers every question about the food.
Keep a short comparison note
Use this five-line note when a package is confusing. It works on paper or in a phone note; there is no need to create a diet score.
- The question I am answering:
- The product and exact package size:
- The serving or package column I used:
- The nutrient, amount and unit:
- Anything I still need to check:
A finished note might read: “I want the sodium in the full container. Product C contains two servings. The per-package column says 480 mg sodium. I have not compared its price or ingredients.” That last sentence prevents a narrow calculation from turning into a much broader claim.
What if two readings disagree?
Check the column and units before assuming the label is wrong. One person may have copied the per-serving amount while another copied the whole package. A photograph may show a different size or version of the product. Compare the same package first, then repeat the calculation. If the discrepancy remains, keep a clear photo and ask the manufacturer about the specific entry rather than guessing.
This checklist explains label interpretation. It does not determine an individual’s nutrient needs or whether a food is suitable for a medical condition.
