How to compare nutrition labels without comparing the wrong numbers.
Serving sizes, per-100-gram values, and a simple worked example for readers shopping in the United States or European Union.
AI-generated illustrationBegin with the amount being described
Two foods can display different nutrient numbers simply because their labels describe different quantities. Before deciding which has more fiber, sugar, or energy, find the amount those numbers refer to. Is it one serving, the whole container, or 100 grams? This guide explains a comparison method, not a personalized meal plan. The examples are invented to demonstrate arithmetic; they do not describe tested products or recommend a brand.
In the United States, check the serving first
FDA explains that the Nutrition Facts label generally describes nutrients in one serving. The serving size reflects what people typically consume; it is not an instruction about how much you personally should eat. Also check servings per container. If a package contains two servings and you consume all of it, the amounts you receive differ from the one-serving column. Some products provide an additional column for the whole package, so read the headings instead of assuming every number uses the same basis.
For EU labels, look for the per-100-gram column
EU nutrition declarations generally show energy and nutrient amounts per 100 grams or 100 milliliters. Additional portion information may also be provided. The standard quantity helps compare similar foods, while the portion information can help you understand the amount you might actually consume. This section describes the European Union format; it should not be read as a statement that every country in Europe uses identical rules. On any package, check the units and headings you can actually see.
A worked example: the smaller number is not always lower
Imagine cereal A lists 3 grams of fiber per 30-gram serving, while cereal B lists 4 grams per 50-gram serving. Looking only at 3 versus 4 makes B appear higher. On an equal-weight basis, A has 3 divided by 30, multiplied by 100: 10 grams of fiber per 100 grams. B has 4 divided by 50, multiplied by 100: 8 grams per 100 grams. A is higher by weight. If you eat the stated portions, however, B's portion still supplies more fiber. Both observations are correct because they answer different questions.
Use percentages for context, with the right reference
On a U.S. Nutrition Facts label, percent Daily Value indicates how a nutrient in a serving contributes to a reference daily diet. FDA's general guide calls 5% DV or less low and 20% DV or more high. Those are label-reading reference points, not an individualized prescription. They also do not make a complete verdict about a food. Compare the same nutrient and serving basis, then consider the rest of the meal and any professional dietary guidance you follow.
Do not mix up similar-looking terms
An EU declaration's sugars figure and a U.S. label's added sugars figure are not interchangeable. FDA distinguishes total sugars from added sugars, which are included within the total. The EU's standard declaration includes sugars, while additional details vary. Sodium and salt are also different label terms; do not compare their printed numbers as if they used the same definition or unit. When the headings differ, find an appropriate explanation before drawing a conclusion. No conversion is needed if you choose two comparable products using the same label format.
Try a small shopping comparison
Choose two similar foods you would realistically buy. Write down the serving basis, units, one nutrient you want to compare, and the amount you expect to use. Compare on an equal basis first, then calculate the amount for that portion if useful. Keep taste, price, availability, allergies, and dietary restrictions in the decision too. A single nutrient number cannot tell you whether a food fits your entire diet. If a medical condition makes the decision more complicated, ask a qualified clinician or dietitian how to use the label for your needs.
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AI-generated illustration