What ring size is 20.5 mm?
A 20.5 mm inner diameter is a US 11 — UK V½, EU 65, Japan 23.
- US
- 11
- UK
- V½
- EU
- 65
- Japan
- 23
- Inner diameter, millimetres
- 20.5
- Circ mm
- 64.4
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See the full international ring size chart · Converter
Frequently asked questions
Is 20.5 mm a diameter or circumference?
On this page 20.5 mm is the inner diameter (the width across the inside of the ring). The matching inner circumference is about 64.4 mm.
How should I confirm a converted ring size before ordering?
Measure the same finger or a ring that fits with a second method. For an expensive, wide, or non-resizable ring, check the retailer's chart and confirm with a physical sizer or jeweller.