Ringsizely

US 13 to Japan ring size

US ring size 13 is Japan 27 — 22.20 mm inner diameter (69.7 mm circumference).

Your size is US 13 (UK Z½, EU 70).

Fit confidence Exact table match

Fit confidence 70/100 · Medium Standard chart conversion; final fit still depends on band width and knuckle shape. Confirm with a printable or physical sizer before ordering an expensive ring.

US
13
UK
Z½
EU / ISO
70
Japan
27
CH / IT / ES
30
Inner diameter, millimetres
22.20
Circ mm
69.7
Why this size?

Your input maps to US 13 — UK Z½, EU 70, JP 27, Ø 22.20 mm.

Inner diameter is exact to about ±0.1 mm. String or on-screen methods add roughly ½–1 size of noise, so confirm with a second method before buying an expensive or non-resizable ring.

Open US 13 size guide

More options
Local only; no account.
Ring fit fix advisor

Choose the fit problem and get the safest next step before resizing, replacing or buying another ring.

Too tight or stuck Too loose or spinning Wide band or comfort-fit Non-resizable or brand ring

Nearby sizes

Nearby sizes
USJapanInner diameter, millimetres
122521.39
132722.20

Frequently asked questions

Are US and Japan ring sizes the same?

No — they use different scales, so the numbers do not match and must be converted. International equivalents are approximate; when possible, order by millimetre diameter.

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.

Explore

Ring Size Conversions — All Systems & Sizes · Size 13 · See the full international ring size chart