Ring Size Guide

The most reliable way to find your size is to measure a ring you already own and love. Inside diameter is the measurement that actually matters, so if you are between two sizes, size up. A ring that is slightly loose can be worn. One that is too tight cannot.

Ring size chart

US size	UK size	Inside diameter	Inside circumference
2	D½	13.3 mm	41.8 mm
2.5	E½	13.7 mm	43.0 mm
3	F½	14.1 mm	44.3 mm
3.5	G½	14.5 mm	45.6 mm
4	H½	14.9 mm	46.8 mm
4.5	I½	15.3 mm	48.1 mm
5	J½	15.7 mm	49.3 mm
5.5	K½	16.1 mm	50.6 mm
6	L½	16.5 mm	51.9 mm
6.5	M½	16.9 mm	53.1 mm
7	N½	17.3 mm	54.4 mm
7.5	O½	17.7 mm	55.7 mm
8	P½	18.1 mm	57.0 mm
8.5	Q½	18.5 mm	58.3 mm
9	R½	18.9 mm	59.5 mm
9.5	S½	19.4 mm	60.8 mm
10	T½	19.8 mm	62.1 mm

Our rings run from a US 2 upward. If your size is not listed, email us, most designs can be made to order.

Method one: measure a ring you already own

1. Choose a ring that fits the finger you are buying for.
2. Lay it flat and measure straight across the inside, from one inner edge to the other.
3. Match that measurement to the inside diameter column above.

Use a ruler with millimetres and measure at the widest point of the inside circle. Half a millimetre changes the size, so measure twice.

Method two: measure your finger

1. Cut a strip of paper about 5 mm wide and 100 mm long. Paper works better than string, which stretches.
2. Wrap it snugly around the base of your finger, not tight, and mark where the ends overlap.
3. Lay the strip flat and measure from the end to your mark in millimetres.
4. Match that number to the inside circumference column above.

Buying for your little finger

A pinkie ring is usually a size or two smaller than the same person's ring finger, though it varies more than most guides admit, so treat it as a starting point rather than a rule. If you are borrowing a ring from another finger to work out a pinkie size, take a size or two off. If you can measure the actual finger, do that instead.

Our smaller sizes, US 2 to US 4, are the usual pinkie range.

A few things worth knowing

• Measure at the end of the day. Fingers are largest in the evening and in warm weather, and smallest first thing and when you are cold.
• Check the knuckle. The ring has to pass over it. If your knuckle is noticeably wider than the base of your finger, go up a size.
• Wider bands feel tighter. If you are buying a chunky band, consider sizing up.
• Buying a surprise gift? Borrow a ring they already wear on the right finger and use method one. If you are guessing, the most common size we sell is a US 6.

Still not sure?

Email us at info@aarialondon.com with the measurement you have taken and we will help. We would much rather get it right first time than have you send it back.