Ring size 10 in mm, cm, UK and EU

Ring size 10 in the US means a ring 19.8 mm wide inside and 62.1 mm round. The UK calls the same ring T½, Europe 62, Japan 20 and India 22.

Ring size 10 in every system

Ring size 10 in mm, cm, UK and EU: every system
US and Canada	10
UK, Ireland, Australia	T½
Europe (EU)	62
Japan and China	20
India	22
Italy, Spain, Switzerland	22
Across the inside	19.8 mm · 1.98 cm · 0.778 in
Around the inside	62.1 mm · 6.2 cm · 2.44 in

One whole size bigger, US 11, is just under 1 mm wider. All of these numbers are from the standard ring size conversion table.

Check a ring against ring size 10 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

US10

UK T½ · EU 62 · Japan 20 · India 22

19.8 mm (0.78 in) across the inside · 62.1 mm (2.44 in) around

For a wide band (over 4 mm), go up about half a size, to US 10½.

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)
9	R½	60	19.0	59.5
9¼	S	60	19.2	60.2
9½	S½	61	19.4	60.8
9¾	T	61	19.6	61.4
10	T½	62	19.8	62.1
10¼	U	63	20.0	62.7
10½	U½	63	20.2	63.4
10¾	V	64	20.4	64.0
11	V½	65	20.6	64.6

Common questions about ring size 10

How many millimetres is US ring size 10?

It is 19.8 mm wide inside and 62.1 mm round the inside. In inches, the width is 0.78.

How many centimetres is US ring size 10?

Round the inside it is 6.2 cm, and it is 1.98 cm wide.