Ring Size Conversion Chart
Translate ring sizes across US, UK, and EU systems with confidence.
Ring sizing differs around the world, which can be confusing when shopping internationally. The good news: every system maps to the same thing — the inside circumference of the band. Here is how to convert between them.
Approximate conversion guide
| US | UK | EU | Inside diameter |
|---|---|---|---|
| 5 | J½ | 49 | 15.7 mm |
| 6 | L½ | 52 | 16.5 mm |
| 7 | N½ | 54 | 17.3 mm |
| 8 | P½ | 57 | 18.1 mm |
| 9 | R½ | 59 | 19.0 mm |
| 10 | T½ | 62 | 19.8 mm |
Values are approximate and rounded — always confirm with the seller's own size guide before ordering.
How to use it
Find your known size in one column and read across. If you only know your finger's measurement, match the inside diameter. When in doubt, measure at home first — see How to Measure Your Ring Size at Home.
A note on accuracy
Conversions vary slightly between charts, and fingers change through the day — see Why Does Ring Size Change? For an important gift, it is worth confirming the exact size.
FAQs
How do ring size systems relate to each other?
They all describe the band's inside circumference — just labeled differently (numbers in the US/EU, letters in the UK), so any size can be converted.
Are conversion charts exact?
They are close approximations — small rounding differences exist, so confirm with the seller's guide for an important purchase.
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