UK to Diameter (mm) Ring Size for Wide Band Fit
Snapshot
10 UK ring size equals 18.2 Ring diameter (mm). Conversion Encyclopedia uses the same fixed conversion basis across the calculator, common values, and reverse page for this page.
- Reference basis: This result uses the selected mm mapping as the profile basis.
- Example: For 8 UK ring size, the mm mapping returns 16.6 Ring diameter (mm) under the same fit assumptions.
- Use the reverse page if you need the opposite direction with the same basis.
Use the interactive calculator below for custom values and the common-value table for quick checks.
Converter Calculator
18.2 Diameter (mm) value
SwitchExplanation
UK converts to Diameter (mm) by normalizing to ring diameter in millimeters, then remapping to the target system. Fit profile fixed: Wide Band Fit.
For UK ring size to Ring diameter (mm), the active mm fit mapping determines the conversion constants applied to every value.
Keep the same fit profile in both directions to avoid mixing size mappings that use different apparel allowances.
Common Conversion Values
| UK value | Diameter (mm) value |
|---|---|
| 8 | 16.6 |
| 9 | 17.4 |
| 10 | 18.2 |
| 11.5 | 19.4 |
| 12.5 | 20.3 |
Frequently Asked Questions
How can I convert back from Ring diameter (mm) to UK ring size?
Use the mirror Ring diameter (mm) to UK ring size route; it applies the inverse relationship for the opposite direction with the same assumptions.
What fit profile is used on this page?
Wide Band Fit.
What formula is used for UK ring size to Ring diameter (mm)?
The converter applies the formula defined for UK ring size to Ring diameter (mm), then renders rounded output for the direct answer and common-value rows.