US to Diameter (mm) Ring Size for Standard Fit
Snapshot
8 US ring size equals 18.1 Ring diameter (mm).
- Reference basis: This result uses the selected mm mapping as the profile basis.
- Example: For 6 US ring size, the mm mapping returns 16.5 Ring diameter (mm) under the same fit assumptions.
Interactive conversion
Converter Calculator
Decimals: 1.5 or 1,5. Fractions: 1/2. Scientific notation: 1e3. Write 1000 without grouping separators.
18.1 Diameter (mm) value
SwitchAPI and AI agent access
US to Diameter (mm) Ring Size for Standard Fit. fit: standard-fit.
Machine-readable identifiers
- Conversion family
ring-size- Source unit
us- Target unit
diameter-millimeters- Fit
standard-fit
Use these identifiers in the API request. Sources and model limits also apply to software clients.
Example API request and response
POST /api/v1/convertRequest
{
"family": "ring-size",
"value": 8,
"from": "us",
"to": "diameter-millimeters",
"parameters": {
"fit": "standard-fit"
}
}Essential response
{
"ok": true,
"conversion": {
"family": "ring-size",
"value": 8,
"from": "us",
"to": "diameter-millimeters",
"result": {
"raw": 18.1324,
"display": "18.1"
},
"canonicalPath": "/apparel-size/ring-size/us-to-diameter-millimeters-for-standard-fit/"
}
}Explanation
US converts to Diameter (mm) using inner ring diameter in millimeters. Fit profile: Standard Fit.
Model estimate based on inner ring diameter, not a fit guarantee. No manufacturer chart is established for this model; compare your measurement with the brand’s chart.
Common Conversion Values
| US value | Diameter (mm) value |
|---|---|
| 6 | 16.5 |
| 7 | 17.3 |
| 8 | 18.1 |
| 9 | 18.9 |
| 10 1/2 | 20.2 |