Ring size 13 in millimetres

US ring size 13 is 22.20 mm inner diameter and 69.7 mm circumference.

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

50 mm reference

Actual-size print check Inner diameter: 22.20 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

Convert size 13: UK · EU · Japan

Frequently asked questions

What is ring size 13 in mm?

US ring size 13 has an inner diameter of 22.20 mm and an inner circumference of 69.7 mm.

What is US 13 in UK, EU and Japan ring sizes?

US 13 converts to UK Z½, EU/ISO 70, Japan 27, and Switzerland/Italy/Spain 30.

Is ring size 13 small or large?

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