22.5 mm ring size

The 22.5 mm ring size, measured straight across the inside, is about a US 13¼. In the UK it is Z1, and in Europe 70, and the ring is 70.7 mm round the inside.

22.5 mm ring size in every system

22.5 mm ring size: every system
US and Canada	about 13¼
UK, Ireland, Australia	Z1
Europe (EU)	70
Japan and China	above 27
India	30 to 31
Italy, Spain, Switzerland	30
Across the inside	22.5 mm · 2.25 cm · 0.886 in
Around the inside	70.7 mm · 7.1 cm · 2.78 in

Every half millimetre is a little over half a US size, so a 22.0 mm or 23.0 mm ring is the next size down or up. All of these numbers are from the standard ring size conversion table.

See a 22.5 mm ring at its real size

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

US13¼

UK Z1 · EU 70 · Japan above 27 · India 30 to 31

22.5 mm (0.89 in) across the inside · 70.7 mm (2.78 in) around

Between US 13 and 13½? Choose 13½, the bigger one, especially for a wide band.

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)
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
13¾	Z2	72	22.8	71.7
14	Z3	72	23.0	72.3
14¼	Z3 to Z4	73	23.2	72.9

Your questions on a 22.5 mm ring

How long is the inside of a 22.5 mm ring, measured all the way round?

Round the inside it is 70.7 mm, which is 7.1 cm. Straight across, it is 0.89 inches.

Which US ring size matches 22.5 mm across?

It is close to a US 13¼. In the UK that ring is Z1, and in Europe 70.