Ring size 12.5 in millimetres

US ring size 12.5 is 21.79 mm inner diameter and 68.5 mm circumference.

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

50 mm reference

Actual-size print check Inner diameter: 21.79 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 12.5 in mm?

US ring size 12.5 has an inner diameter of 21.79 mm and an inner circumference of 68.5 mm.

What is US 12.5 in UK, EU and Japan ring sizes?

US 12.5 converts to UK Z, EU/ISO 68, Japan 26, and Switzerland/Italy/Spain 28.

Is ring size 12.5 small or large?

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