Ring size 4.5 in millimetres

US ring size 4.5 is 15.29 mm inner diameter and 48.0 mm circumference.

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

50 mm reference

Actual-size print check Inner diameter: 15.29 mm. Print at 100% and verify the 50 mm reference bar before comparing a ring.

This is a smaller-than-average size (the average women’s size is about US 6–6½). See the full international ring size chart · Converter

Frequently asked questions

What is ring size 4.5 in mm?

US ring size 4.5 has an inner diameter of 15.29 mm and an inner circumference of 48.0 mm.

What is US 4.5 in UK, EU and Japan ring sizes?

US 4.5 converts to UK I½, EU/ISO 48, Japan 8, and Switzerland/Italy/Spain 8.

Is ring size 4.5 small or large?

This is a smaller-than-average size (the average women’s size is about US 6–6½).