I Know My Local Size, But Not Your Letters!
Our guide to standard conversions are below for the most common local sizes that we use. You can also use the inside diameter measurement of an existing ring if you have forgotten the sizing.
All sizing conversions are approximate as we are a handmade company so some slight differences may occur within 1mm.
UK D | US 2 | EU 41 1/2 | Inside Diameter 13.21mm | Inside Circumference 41.50mm
UK E | US 2 1/2 | EU 42 3/4 | Inside Diameter 13.61mm | Inside Circumference 42.76mm
UK F | US 3 | EU 44 | Inside Diameter 14.05mm | Inside Circumference 44.14mm
UK G | US 3 3/8 | EU 45 1/4 | Inside Diameter 14.36mm | Inside Circumference 45.11mm
UK H | US 3 3/4 | EU 46 1/2 | Inside Diameter 14.65mm | Inside Circumference 46.02mm
UK I | US 4 1/4 | EU 47 3/4 | Inside Diameter 15.04mm | Inside Circumference 47.25mm
UK J = US 4 5/8 - EU 49 | Inside Diameter 15.40mm | Inside Circumference 48.38mm
UK K = US 5 1/8 - EU 50 | Inside Diameter 15.80mm | Inside Circumference 49.64mm
UK L = US 5 1/2 - EU 51 3/4 | Inside Diameter 16.10mm | Inside Circumference 50.58mm
UK M = US 6 - EU 52 3/4 | Inside Diameter 16.51mm | Inside Circumference 51.87mm
UK N = US 6 1/2 - EU 54 | Inside Diameter 16.92mm | Inside Circumference 53.16mm
UK O = US 7 - EU 55 1/4 | Inside Diameter 17.35mm | Inside Circumference 54.21mm
UK P = US 7 1/2 - EU 56 1/2 | Inside Diameter 17.75mm | Inside Circumference 55.76mm
UK Q = US 8 - EU 57 3/4 | Inside Diameter 18.19mm | Inside Circumference 57.15mm
UK R = US 8 5/8 - EU 59 | Inside Diameter 18.61mm | Inside Circumference 58.47mm
UK S = US 9 1/8 - EU 60 1/4 | Inside Diameter 19.10mm | Inside Circumference 60mm
UK T = US 9 5/8 - EU 61 1/2 | Inside Diameter 19.51mm | Inside Circumference 61.29mm
UK U | US 10 1/4 | EU 62 3/4 | Inside Diameter 20.02mm | Inside Circumference 62.89mm
UK V | US 10 5/8 | EU 63 | Inside Diameter 20.32mm | Inside Circumference 63.84mm
UK W | US 11 1/8 | EU 65 | Inside Diameter 20.76mm | Inside Circumference 65.22mm
UK X | US 11 5/8 | EU 66 1/4 | Inside Diameter 21.18mm | Inside Circumference 66.54mm
UK Y | US 12 | EU 67 1/2 | Inside Diameter 21.49mm | Inside Circumference 67.51mm
UK Z | US 12 1/2 | EU 68 3/4 | Inside Diameter 21.89mm | Inside Circumference 68.77mm
UK Z+1 | US 13 | EU 70 | Inside Diameter 22.33mm | Inside Circumference 70.15mm
The simplest answer is that its down to the shape of your finger and where fat is stored on the hands.
If you have a quick feel of your finger (squeezing firmly from the base near the knuckle and moving slowly upwards to the middle joint) you'll notice that there is a small fat store. It doesn't start at the very bottom of the finger - it starts a few millimetres up and continues to close to the middle joint. This fat store is where problems happen for wider rings.
To demonstrate this, make a fist. Turn your hand toward you so you can see your nails and look at the shape of the finger that you just felt. Do you see how your finger flares out slightly the closer that you get to the middle joint? The bottom of your finger remains the same size and shape, but the closer that you get to the middle joint, the wider your finger gets. This is where the problem lies with wider rings as most people don't take this "fat flare" into consideration when sizing for the larger rings. It can often add up to 2 sizes difference to your standard size.
When people measure for a standard 3-6mm ring, they measure at the very base of the finger - close to the knuckle. This is absolutely fine for a standard ring, as it doesn't really catch much of the fat store. It sits comfortably underneath.
I'd always recommend visiting a local jeweller first of all to get your local size, however I do understand that this isn't always possible for loads of different reasons.
If you aren't able to visit a jeweller, my next recommendation would be purchasing a ring sizer. We sell the ring sizer shown in the pictures above. This plastic multisize ring gauge is ideal for self finger sizing. The multisizer works like a belt, forming a ring and then placing over the finger, which is then adjusted to give a comfortable fit. You would then simply read off the indicated size.
For wider rings, you should measure where I have placed the ring sizer in the picture above. This makes sure that the "Fat Flare" is taken into consideration.
For spinning rings, we recommend finding your size using this method of making a fist and adding on one UK ring size. The reason for this is that when spinning rings are made, they are designed to be concave so often feel one size smaller in the middle.
If this isn't an option for you, then I would recommend taking the internal diameter measurement from an existing ring of a similar size and shape that fits well. The easiest way of doing this is by placing a ruler on the table and placing the ring on top of the ruler. If you look straight down, the parts that are still visible are the diameter measurements that you will need.