Ringsizely

Ring size 9 in millimetres

US ring size 9 is 18.95 mm inner diameter and 59.5 mm circumference.

18.95 mm inner Ø
Proportional only — actual on-screen size depends on your display.
US / CA
9
UK / AU
R½
EU / ISO
60
Japan
18
CH / IT / ES
20
Ø in
0.746
50 mm reference
Actual-size print check Inner diameter: 18.95 mm. Print at 100% and verify the 50 mm reference bar before comparing a ring.

This is around the average men’s ring size (US 9–10). Compare it on the full ring size chart, or use the converter if your measurement falls between sizes.

Convert size 9: UK · EU · Japan

Frequently asked questions

What is ring size 9 in mm?

US ring size 9 has an inner diameter of 18.95 mm and an inner circumference of 59.5 mm.

What is US 9 in UK, EU and Japan ring sizes?

US 9 converts to UK R½, EU/ISO 60, Japan 18, and Switzerland/Italy/Spain 20.

Is ring size 9 small or large?

This is around the average men’s ring size (US 9–10).