Ring size 15 in mm, cm, UK and EU

Ring size 15 in the US means a ring 23.8 mm wide inside and 74.8 mm round. The UK calls the same ring above Z4, Europe 75, Japan above 27 and India 35.

Ring size 15 in every system

Ring size 15 in mm, cm, UK and EU: every system
US and Canada	15
UK, Ireland, Australia	above Z4
Europe (EU)	75
Japan and China	above 27
India	35
Italy, Spain, Switzerland	35
Across the inside	23.8 mm · 2.38 cm · 0.938 in
Around the inside	74.8 mm · 7.5 cm · 2.94 in

One whole size bigger, US 16, is just under 1 mm wider. All of these numbers are from the standard ring size conversion table.

Check a ring against ring size 15 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

US15

UK above Z4 · EU 75 · Japan above 27 · India 35

23.8 mm (0.94 in) across the inside · 74.8 mm (2.94 in) around

For a wide band (over 4 mm), go up about half a size, to US 15½.

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)
14	Z3	72	23.0	72.3
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.

Common questions about ring size 15

How many millimetres is US ring size 15?

It is 23.8 mm wide inside and 74.8 mm round the inside. In inches, the width is 0.94.

How many centimetres is US ring size 15?

Round the inside it is 7.5 cm, and it is 2.38 cm wide.