Finding your ring size

Happy to help you get this right. Ask us for a free ring sizer and we will post one out, no charge and no obligation, and you will know your size for certain.

Before you measure, two things that will help

Our rings are comfort fit. That means the inside of the band is gently domed rather than flat, so it slides over the knuckle more easily and feels a little roomier than a flat band of the same size.

So if you land between two sizes, choose the smaller one. A slightly snug ring settles in nicely. A slightly loose one tends to spin, and never quite feels secure on your finger.

Four ways to find your size

Listed best first. Any of them will do, but the first two are the most reliable.

1. Pop into a jeweller

Any high street jeweller will size you in a couple of minutes, and it is normally free. Do mention that the band is 6mm or 8mm wide with a comfort fit interior, because a wider band needs a slightly larger size and a good jeweller will allow for it.

2. Ask us for a free ring sizer

A small adjustable band that fastens round your finger like a belt. It is marked with US numbers, which match the sizes on our product pages. We post it free, you keep it, and there is no obligation to buy anything. It usually arrives in two to three days.

Request a free ring sizer

3. Measure a ring you already wear

Choose one that fits the finger you have in mind, lay it flat, and measure straight across the inside in millimetres. Match that number to the inside diameter column in the chart below. Measure twice, because half a millimetre is enough to move you a size.

If the ring you are measuring has a flat inside rather than a domed one, expect ours to feel slightly roomier at the same size.

4. Wrap a strip of paper round your finger

Useful if you have nothing else to hand. Wrap a strip of paper or a piece of non-stretchy string around the base of the finger, mark where the ends meet, then measure the length in millimetres and match it to the around your finger column below. Wrap it snugly rather than tightly, since the ring still has to pass your knuckle. Never use elastic, and treat the answer as a good guide rather than gospel.

Printable ring sizer

Print it at 100 per cent scale, and make sure your printer is not set to "fit to page" or "shrink to fit". If the scale is off, every measurement on the sheet is off with it. Check the reference line against a ruler before you use it.

Download the printable ring sizer

Size conversion chart

UK sizes are letters, US sizes are numbers, and they describe exactly the same ring.

UK jewellers use letters, so a UK size might be given to you as R or P½, where the ½ simply means half a size up from P. American sizing uses numbers instead, so the same two rings are 8.5 and 8. Our product pages show both together, for example P½ (US 8), so you can order from whichever you have been given.

US size numbers	UK size letters	Inside diameter straight across, mm	Around your finger all the way round, mm
5	J½	15.7	49.3
5.5	K½	16.1	50.5
6	L½	16.5	51.8
6.5	M½	16.9	53.1
7	N½	17.3	54.4
7.5	O½	17.7	55.7
8	P½	18.1	56.9
8.5	R	18.5	58.2
9	S	19.0	59.5
9.5	T	19.4	60.8
10	U	19.8	62.1
10.5	V	20.2	63.3
11	W	20.6	64.6
11.5	X	21.0	65.9
12	Y	21.4	67.2
12.5	Z	21.8	68.4
13	Z+1	22.2	69.7
13.5	Z+1½	22.6	71.0
14	Z+2	23.0	72.3
14.5	Z+3	23.4	73.5
15	Z+4	23.8	74.8

Sizes above Z continue as Z+1, Z+1½, Z+2 and so on, which is just the UK system carrying on past the end of the alphabet. The shaded rows, US 8 to 10, are the sizes we sell most of. Not every style is made in the full range.

Getting an accurate measurement

Small things that make a real difference.

Measure in the evening. Fingers are at their largest by the end of the day, and that is the size you want the ring to fit.
Not when your hands are cold. A cold hand can read a full size smaller, which is how a ring ends up spinning all summer.
Not straight after the gym. Fingers swell with exercise and you will size up when you did not need to.
Measure two or three times, on different days. If the answers differ, go with the one you got most often.
Measure the actual finger, on the actual hand. Your dominant hand usually runs a touch larger.
Think about your knuckle. If yours is noticeably bigger than the base of your finger, you need a size that clears the knuckle without spinning once it is on. This is the one case where a jeweller really is worth the trip.

If you land between two sizes

Our recommendation: take the smaller one.

Comfort fit already gives you a little room, so the smaller size is usually the one that feels secure and settles in comfortably.

There is one exception. If you have a pronounced knuckle, or fingers that swell noticeably in warm weather, size up instead and accept that it will sit a little loose on a cold morning.

If the fit is not right when it arrives

We will sort it. Just tell us within 30 days.

Email returns@foundoria.co.uk with your order number and the size you would like instead. In the UK, size exchanges are free.

If we do not hold your replacement size in stock, we will either make it for you or suggest an alternative you might like just as much. Either way we will tell you what to expect before anything is agreed.

Exchanges and returns in full

Common questions

Can these rings be resized?

Not ours, and the reason is the inlay rather than the metal.

Resizing means cutting the band, taking metal out or adding it in, then closing the band up again. A natural inlay will not survive that. Meteorite, deer antler and barrel oak are set into the band as one continuous ring, so cutting it either cracks the material or breaks the bond holding it in place. Every ring we make carries a natural inlay or a natural sleeve, so it applies right across the range.

The metal is a factor too, though a smaller one than people assume. Tungsten carbide sits at 8.5 to 9 on the Mohs scale and genuinely cannot be resized by anyone. Titanium and zirconium are more workable, and a specialist can sometimes shift a plain band by a fraction of a size, but it is slow, costly work and it is not an option once there is an inlay to protect.

All of which is why we would far rather post you a free ring sizer first, and why we exchange rather than alter if the fit is not right.

What is the most common size?

For men, US 8 to 10, which is UK P½ to U. US 9, or UK S, sits roughly in the middle. Still worth measuring rather than assuming.

How should a ring feel when it fits properly?

It should take a little effort to get over the knuckle, then sit at the base of your finger without turning freely. If it slips off when you shake your hand it is too big. If it leaves a deep groove or throbs, it is too small.