Ringsizely

Ring size 13 in millimetres

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

22.20 mm inner Ø
Proportional only — actual on-screen size depends on your display.
US / CA
13
UK / AU
Z½
EU / ISO
70
Japan
27
CH / IT / ES
30
Ø in
0.874
C (in)
2.744
Actual-size print check Inner diameter: 22.20 mm. Print at 100% and verify the 50 mm reference bar before comparing a ring.

A size label alone does not predict fit. Measure the exact finger and hand, and check the band width before ordering. See the full international ring size chart · Converter

Convert size 13: UK · EU · Japan

Frequently asked questions

Is ring size 13 small or large?

A size label alone does not predict fit. Measure the exact finger and hand, and check the band width before ordering.

I am between sizes — should I size up or down?

Measure again at a different time. If the result stays between sizes, compare band width, knuckle clearance, and the retailer's chart before choosing. A wider band can feel tighter than a narrow one at the same labelled size.

How should I confirm a converted ring size before ordering?

Measure the same finger or a ring that fits with a second method. For an expensive, wide, or non-resizable ring, check the retailer's chart and confirm with a physical sizer or jeweller.