24 mm ring size

The 24 mm ring size, measured straight across the inside, is about a US 15¼. In the UK it is above Z4, and in Europe 76, and the ring is 75.4 mm round the inside.

24 mm ring size in every system

24 mm ring size: every system
US and Canada	about 15¼
UK, Ireland, Australia	above Z4
Europe (EU)	76
Japan and China	above 27
India	35 to 36
Italy, Spain, Switzerland	36
Across the inside	24.0 mm · 2.40 cm · 0.945 in
Around the inside	75.4 mm · 7.5 cm · 2.97 in

Every half millimetre is a little over half a US size, so a 23.5 mm or 24.5 mm ring is the next size down or up. All of these numbers are from the standard ring size conversion table.

See a 24 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

US15¼

UK above Z4 · EU 76 · Japan above 27 · India 35 to 36

24.0 mm (0.95 in) across the inside · 75.5 mm (2.97 in) around

Between US 15 and 15½? Choose 15½, 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)
14¼	Z3 to Z4	73	23.2	72.9
14½	Z4	74	23.4	73.6
14¾	–	74	23.6	74.2
15	–	75	23.8	74.8
15¼	–	76	24.0	75.5
15½	–	76	24.2	76.1
15¾	–	77	24.4	76.8
16	–	77	24.6	77.4

A dash means that country has no size for this ring. It happens only with the very smallest and very largest rings, which jewellers sell by their US or European size.

Your questions on a 24 mm ring

How long is the inside of a 24 mm ring, measured all the way round?

Round the inside it is 75.4 mm, which is 7.5 cm. Straight across, it is 0.94 inches.

Which US ring size matches 24 mm across?

It is close to a US 15¼. In the UK that ring is above Z4, and in Europe 76.