Ring size 13.5 in mm, cm, UK and EU

Ring size 13½ in the US means a ring 22.6 mm wide inside and 71.0 mm round. The UK calls the same ring Z1 to Z2, Europe 71, Japan above 27 and India 31.

Ring size 13.5 in every system

Ring size 13.5 in mm, cm, UK and EU: every system
US and Canada	13½
UK, Ireland, Australia	Z1 to Z2
Europe (EU)	71
Japan and China	above 27
India	31
Italy, Spain, Switzerland	31
Across the inside	22.6 mm · 2.26 cm · 0.890 in
Around the inside	71.0 mm · 7.1 cm · 2.80 in

One whole size bigger, US 14½, is just under 1 mm wider. All of these numbers are from the standard ring size conversion table.

Check a ring against ring size 13.5 on your screen

1Match a bank card

The card works like a ruler: nothing on it is read or saved, and a driving licence works too. Only its height counts, so the drawing may run off the edge of a phone. Hold the card flat on the screen, long side across, with its top edge on the drawing's top line. Then move the slider until the drawing's bottom line meets the card's bottom edge.

Optional. Only needed to lay a ring or strip on the screen; typed measurements work without it. Nothing on the card is read or saved.

2Measure

A ring I own My finger Print a sizer

Inside diameter of your ring mm

Lay the ring on the circle, or type the inside diameter if you measured it.

Length of your paper strip mm

Wrap a thin strip of paper around the base of your finger, mark where it overlaps, then measure to the mark.

The circle shows a 17.3 mm ring, drawn for a typical screen.

This size, drawn on your screen

US13½

UK Z1 to Z2 · EU 71 · Japan above 27 · India 31

22.6 mm (0.89 in) across the inside · 71.0 mm (2.80 in) around

For a wide band (over 4 mm), go up about half a size, to US 14.

See every size in the ring size chart · Convert a size you already know

Nearby sizes

Too tight or too loose? Try the size one row up or one row down.

Nearby sizes
US and Canada	UK and Australia	Europe (EU)	Inside diameter (mm)	Circumference (mm)
12½	Y½	68	21.8	68.5
12¾	Z	69	22.0	69.1
13	Z½	70	22.2	69.7
13¼	Z1	70	22.4	70.4
13½	Z1 to Z2	71	22.6	71.0
13¾	Z2	72	22.8	71.7
14	Z3	72	23.0	72.3
14¼	Z3 to Z4	73	23.2	72.9
14½	Z4	74	23.4	73.6

Common questions about ring size 13.5

How many millimetres is US ring size 13½?

It is 22.6 mm wide inside and 71.0 mm round the inside. In inches, the width is 0.89.

How many centimetres is US ring size 13½?

Round the inside it is 7.1 cm, and it is 2.26 cm wide.