What ring size is 20 mm?
A 20 mm inner diameter is a US 10.5 — UK U½, EU 63, Japan 22. (between sizes — we suggest sizing up)
- US
- 10.5
- UK
- U½
- EU
- 63
- Japan
- 22
- Ø mm
- 20
- Circ mm
- 62.8
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Frequently asked questions
What ring size is 20 mm?
A 20 mm inner diameter is closest to US 10.5 (UK U½, EU 63, Japan 22). It falls between sizes, so we suggest sizing up.
Is 20 mm a diameter or circumference?
On this page 20 mm is the inner diameter (the width across the inside of the ring). The matching inner circumference is about 62.8 mm.