Ring size 8 in millimetres

US ring size 8 is 18.14 mm inner diameter and 57.0 mm circumference.

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

50 mm reference

Actual-size print check Inner diameter: 18.14 mm. Print at 100% and verify the 50 mm reference bar before comparing a ring.

This sits between the average women’s (US 6–6½) and men’s (US 9–10) sizes. See the full international ring size chart · Converter

Convert size 8: UK · EU · Japan

Frequently asked questions

What is ring size 8 in mm?

US ring size 8 has an inner diameter of 18.14 mm and an inner circumference of 57.0 mm.

What is US 8 in UK, EU and Japan ring sizes?

US 8 converts to UK P½, EU/ISO 57, Japan 16, and Switzerland/Italy/Spain 17.

Is ring size 8 small or large?

This sits between the average women’s (US 6–6½) and men’s (US 9–10) sizes.