Transparent calculator · Labels 1.0
Nutrition Label Decoder
Scale US or EU/UK label values to the amount eaten and show the reference-value arithmetic.
Purpose
What this tool is for
Use this to reconcile a label serving or per-100-unit panel with your actual portion.
Audience
Who it is for
Adults who want transparent label arithmetic in either US %Daily Value or EU/UK Reference Intake mode.
Input glossary
What each field means
| Input | Unit or choice | Why it matters |
|---|---|---|
| Label system | US / EU–UK | Keeps different regulatory definitions and reference values separate. |
| Amount consumed | servings or g/ml | Creates the multiplier applied to each nutrient. |
| Energy and nutrients | kcal, g or mg | Enter only values printed per serving (US) or per 100 g/ml (EU/UK). |
Method · Labels 1.0
The formula or decision logic
US consumed multiplier = servings consumed; full-container multiplier = labelled servings per container. Consumed or container nutrient = per-serving value × the relevant multiplier. %DV = consumed amount ÷ US Daily Value × 100.
EU/UK multiplier = portion ÷ 100. Per-portion nutrient = per-100 g/ml value × multiplier. %RI = per-portion amount ÷ adult Reference Intake × 100.
US total sugar includes natural and added sugars; added sugar is a labelled subset. EU/UK “of which sugars” is total sugar and is never re-labelled as added sugar.
References support the method or context; they do not validate an individual result. See the sources.
Worked example
Example, not a recommendation: a 1.5-serving cereal bowl
- The US label lists 200 kcal, 400 mg sodium and 10 g added sugar per serving.
- At 1.5 servings: 300 kcal, 600 mg sodium and 15 g added sugar.
- 600 ÷ 2,300 × 100 = 26.1% sodium DV; 15 ÷ 50 × 100 = 30% added-sugar DV.
Interactive calculator
Scale a label to your portion
Nothing you enter is sent to our server. Calculation happens in this browser.
Limitations
What the result cannot tell you
- %DV and %RI are population reference values, not personal targets.
- The result depends entirely on accurate package values and portion measurement.
- The tool does not reproduce every jurisdictional rounding rule.
- No score labels a food “healthy” or “unhealthy.”
Questions specific to this tool
Frequently asked questions
Is total sugar the same as added sugar?
No. On a US label, added sugar is part of total sugar. An EU/UK “sugars” line usually does not identify how much was added.
Why does an EU label use values per 100 g?
The standard base makes products easier to compare. This tool multiplies those values by your portion divided by 100.
Does “no added sugar” mean sugar-free?
No. A product may still contain naturally occurring sugar; read the total-sugars line and ingredients.
Should %DV be multiplied for more than one serving?
Yes. This tool scales the nutrient amount first, then calculates the reference percentage for what was eaten.
Why can my result differ from the front of pack?
The package may use different rounding or a different reference basis. Check serving size, jurisdiction and whether values are per serving or per 100 units.
Primary and official references
Sources
How to understand and use the Nutrition Facts Label
US Food and Drug Administration · Current
Supports: US serving and %DV interpretationRegulation (EU) No 1169/2011
European Union · 2011
Supports: EU declarations and Reference IntakesFound a numerical or source issue? Send a correction with the page URL.