What it is
A nutrition label lists energy and nutrients for a stated amount. Formats vary by country, and some labels show both per-serving and per-100-g figures.
Why it matters
A fair comparison needs the same basis. The serving you eat may be larger or smaller than the amount listed.
Practical guidelines
- Find the serving size and number of servings first.
- Compare calories, macros, fiber and sodium on the same basis.
- Distinguish total sugars from added sugars when both are listed; check ingredients and allergen information separately.
Common mistakes
- Comparing one product per serving with another per 100 g.
- Treating a front-of-pack claim as a complete nutrition summary.
Keep it simple
Read the amount before the calories. Use the actual package for a specific branded food.
Research references
Written for Selfboost. References used to check the underlying information; no affiliation or endorsement is implied.
Editorial review: 6 October 2026.