What ring size is 21.5 mm?
A 21.5 mm inner diameter is a US 12.5 — UK Z, EU 68, Japan 26. (between sizes — we suggest sizing up)
- US
- 12.5
- UK
- Z
- EU
- 68
- Japan
- 26
- Ø mm
- 21.5
- Circ mm
- 67.5
Explore
See the full international ring size chart · Converter
Frequently asked questions
What ring size is 21.5 mm?
A 21.5 mm inner diameter is closest to US 12.5 (UK Z, EU 68, Japan 26). It falls between sizes, so we suggest sizing up.
Is 21.5 mm a diameter or circumference?
On this page 21.5 mm is the inner diameter (the width across the inside of the ring). The matching inner circumference is about 67.5 mm.