Euro Denomination Diameter Lookup
Bounded nominal euro circulation coin diameter reference in millimeters for the eight denominations. ECB, technical specifications. Not measured tolerances, commemorative precious-metal issues or authenticity.
Description
Coin diameter is an issue specification distinct from mass, thickness and measured wear.
When to use Euro Denomination Diameter Lookup
Use this tool to read a bounded explanation for an exact reference topic. Establish the coin issue, source edition, measurement basis and reference date where applicable.
How to use Euro Denomination Diameter Lookup and understand its results
- Establish the coin issue, source edition, measurement basis and reference date where applicable.
- Enter denomination, using the field meanings and rules below, then run the tool.
- Read result. Inspect nested result fields where present, and review unknown records separately from known matches.
- Correct any reported input issue and run again. Before using a successful result, check the stated units, signs, reference scope and observation coverage.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| denomination | Denomination | string | Required |
Select an exact denomination token from the table. Return its fixed nominal diameter in millimetres; there is no measured input, tolerance check or issue lookup.
| Selection token | Stored value |
|---|---|
| 1cent | 16.25 |
| 2cent | 18.75 |
| 5cent | 21.25 |
| 10cent | 19.75 |
| 20cent | 22.25 |
| 50cent | 24.25 |
| 1euro | 23.25 |
| 2euro | 25.75 |
diameter=nominalDiameter[denomination] Use the matching field units and the exact boundary, ordering and reference rules above.
| Output field | Meaning | Value type |
|---|---|---|
| result | Calculated observation or qualified reference | object |
| result.diameterMillimeters | diameter Millimeters | number |
{
"input": {
"denomination": "2euro"
},
"output": {
"result": {
"diameterMillimeters": 25.75
}
}
}Limitations and assumptions
Coin identification, reference applicability and measurement uncertainty require separate evidence. A returned explanation or arithmetic agreement does not establish authenticity, a certified grade or a current market value.
Missing required fields, unknown fields, wrong types and violated rules return input issues. Numeric values and outputs must be finite. Extremely large composite outputs are rejected.
Alternative or Complementary methods
For a related step, use Euro Denomination Weight Lookup: Nominal coin mass is a specification for an identified denomination, not an assay or authentication result. For a complementary comparison, use Counterfeit Density Flag Checker: Bulk density is mass divided by volume and can be compared with an issue-specific reference interval.
References
-
Euro Denomination Diameter Lookup — tool.io
-
Common sides: euro coin specifications — European Central Bank
Similar or alternative tools
- Euro Denomination Weight Lookup
Nominal coin mass is a specification for an identified denomination, not an assay or authentication result.
- Counterfeit Density Flag Checker
Bulk density is mass divided by volume and can be compared with an issue-specific reference interval.