Ring size 12.5 in mm, cm, UK and EU

Ring size 12½ in the US means a ring 21.8 mm wide inside and 68.5 mm round. The UK calls the same ring Y½, Europe 68, Japan 26 and India 28 to 29.

Ring size 12.5 in every system

Ring size 12.5 in mm, cm, UK and EU: every system
US and Canada	12½
UK, Ireland, Australia	Y½
Europe (EU)	68
Japan and China	26
India	28 to 29
Italy, Spain, Switzerland	28
Across the inside	21.8 mm · 2.18 cm · 0.858 in
Around the inside	68.5 mm · 6.8 cm · 2.70 in

One whole size bigger, US 13½, is just under 1 mm wider. All of these numbers are from the standard ring size conversion table.

Check a ring against ring size 12.5 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

US12½

UK Y½ · EU 68 · Japan 26 · India 28 to 29

21.8 mm (0.86 in) across the inside · 68.5 mm (2.70 in) around

For a wide band (over 4 mm), go up about half a size, to US 13.

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)
11½	W½	66	21.0	65.9
11¾	X	67	21.2	66.6
12	X½	67	21.4	67.2
12¼	Y	68	21.6	67.8
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

Common questions about ring size 12.5

How many millimetres is US ring size 12½?

It is 21.8 mm wide inside and 68.5 mm round the inside. In inches, the width is 0.86.

How many centimetres is US ring size 12½?

Round the inside it is 6.8 cm, and it is 2.18 cm wide.