Ring size 11.5 in millimetres

US ring size 11.5 is 20.98 mm inner diameter and 65.9 mm circumference.

Proportional only — actual on-screen size depends on your display.

50 mm reference

Actual-size print check Inner diameter: 20.98 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). See the full international ring size chart · Converter

Frequently asked questions

What is ring size 11.5 in mm?

US ring size 11.5 has an inner diameter of 20.98 mm and an inner circumference of 65.9 mm.

What is US 11.5 in UK, EU and Japan ring sizes?

US 11.5 converts to UK W½, EU/ISO 66, Japan 24, and Switzerland/Italy/Spain 26.

Is ring size 11.5 small or large?

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