Ultimate Ring Size Guide

Trying to figure out what you or your partner’s ring size is before you make the big purchase?

I’ve got you covered.

In this article, I have each UK ring size listed in an accessible table along with the respective measurements and also international conversions for those luxury ring imports!

Ring Size Chart UK

For starters, you will need a ring size chart that specifies corresponding ring diameters and circumferences. Every country has its own standard when it comes to ring sizes.

Some base their scales on a ring diameter in millimetres while others use circumferences in centimetres or inches. The UK chart differs from all others – rings sizes are expressed in letters.

The most common sizes vary from F to W, plus there are half sizes (for instance, O-½). The following UK chart below will come in handy to match your finger measurements to a specific ring size.

I’ve also included a UK to US ring size and US ring size to UK conversion equivalent since some online jewellers are from the states.

On the other hand, if you need to find out your measurements first, please click here.

UK Ring SizeUS ConversionDiameter (cm)Circumference (cm)
A1/21.203.78
B11.253.91
C1 1/21.294.04
D21.334.17
E2 1/21.374.29
F31.414.42
G3 1/21.454.45
H41.494.68
I4 1/21.534.80
J4 3/41.554.87
K5 1/41.595.00
L5 3/41.635.12
M6 1/41.675.25
N6 3/41.715.38
O71.755.51
P7 1/21.795.63
Q81.835.76
R8 1/21.885.89
S91.926.02
T9 3/41.966.14
U10 1/42.006.27
V10 3/42.046.40
W11 1/42.086.53
X11 3/42.126.66
Y122.166.78
Z12 1/22.186.85

International Ring Size Conversion Chart

If you’re looking for some other popular countries that have different ring sizes, please check my table below which you can use to convert the measurement after finding out your UK ring size via the table above.

UK/AUUS/CAFR/RUDEJPCH
A1/2
B11
C1 1/2
D241 /1213 1/221 1/2
E2 1/242 3/413 3/432 3/4
F3441444
G3 1/245 1/455 1/4
H446 1/26 1/2
I4 1/247 3/47 3/4
J4 3/44915 1/29
K5 1/45010
L5 3/451 3/41611 3/4
M6 1/452 3/416 1/21212 3/4
N6 3/454171314
O755 1/417 1/41415 1/4
P7 1/256 1/217 3/41516 1/2
Q857 3/4181617 3/4
R8 1/25919
S960 1/420 1/4
T9 3/461 1/221 1/2
U10 1/462 3/42122 3/4
V10 3/46323 3/4
W11 1/46525
X11 3/466 1/426 1/4
Y1267 1/221 1/42527 1/2
Z12 1/268 3/421 3/42628 3/4
UK = United Kingdom, AU = Australia, US = United States, CA = Canada, FR = France, RU = Russia, DE = Germany, JP = Japan, CH = Switzerland

How to Measure Ring Size

Statistics say that an average ring size UK is L for ladies and Q for gentlemen. But what are the chances that your measurements are average, especially when every hand features digits dissimilar in girth? Instead of using guesswork, you should put in some work to determine your size with mathematical precision.

Don’t worry, it won’t take much time, and the best part is that you can do it at home. Below, you will find an easy-to-follow and pretty accurate ring size guide.

The String Method

This method is based on measuring your finger. You will need a piece of floss, string, or a thin strip of paper. Wrap it around the base of the chosen digit. Mark the point where two ends of the piece overlap with a pen or cut it with scissors. Next, measure the resulting length with a ruler in millimetres. This is the circumference of your finger. The final step is to check this circumference against the conversion chart and see which UK ring size it corresponds to.

Please keep in mind that this method doesn’t guarantee 100% accuracy. To make it more precise, please consider the following dos and don’ts:

  1. Don’t wrap a piece of floss or paper too tight or too loose.
  2. Don’t use stretchy flosses.
  3. Take measurements at least 3 times. I recommend that you do it throughout the day – first in the morning, then in the afternoon, and so on. When you have all three numbers, find their average value and look it up in the ring size chart.
  4. Instead of a single wrap, do 3 or 5 wraps and measure their total length. Divide this value by the number of wraps.
  5. If you have a large knuckle (especially if it is larger than the base of your finger), it makes sense to measure it, too. Add up the circumferences of your base and knuckles and calculate their average length. Use this number to get the corresponding ring size.

The Ring Method

Do you already have a perfectly-fitting ring and you want to get another one for the same finger? That’s great because you can use the existing ring to figure out your size.

Take this ring, put it on a sheet of paper, and draw a circle inside of it. Make sure you use a sharp pencil or a fine-tip pen to draw as close to the ring’s internal edge as possible.

Once you’re done, take a ruler and measure the circle’s diameter. Alternatively, you can put a ring right onto a ruler and learn its internal width. Make sure to measure the widest part of the ring.

If a ring size chart UK you utilize provides information on both diameters and circumferences, check the diameter column to find the matching ring size. In case there are only circumferences, multiply your diameter by the Pi number and go on with the resulting number.

The Ring Sizer Method

A ring sizer provides the most accurate information about your fingers and best-fitting rings. You can find plenty of these on the internet at a pretty cheap price.

If you’re planning to purchase a rather expensive bauble (especially with an embellished shank that is impossible to adjust), it makes sense to invest a few pounds into a ring-measurement tool able to tell your size with the most accuracy.

Alternatively, you can make use of a printable ring sizer. Basically, this is a pre-measured piece of paper. You need to print it out, cut it out, and wrap it around your finger. The joint point will show your ring size.

Finally, there is one more sure-fire way to assess your finger size. You don’t have to buy or print out anything. Instead, you will have to visit an actual jewellery store.

Every reputable place has ring size gauges providing the most reliable measurements. You can ask a salesperson to determine your ring size and then use this information to shop online.

Things to Consider When Determining Your Ring Size

If you’re an experienced jewellery wearer, you surely noticed that sometimes your ring fits tighter, and sometimes it gets too loose. It happens because our body constantly changes throughout the day.

For example, when the ambient temperature is cold, our fingers tend to shrink. Vice versa, if it’s too hot, they will swell.

On top of that, our fingers gain extra millimetres when fluids linger in our bodies. This happens after sleep, during physical activities, after excessive water consumption, and in many other cases.

It goes without saying that you shouldn’t trust measurements taken when your fingers differ from their normal size. In general, you should skip picking a ring:

  • in the morning;
  • after continuous sitting;
  • after a long flight;
  • after working out;
  • if you have an increased body temperature;
  • when having your period;
  • when the room temperature is too hot or too cold.

The best time of the day to determine your finger size is afternoon, a couple of hours before and after a meal. Make sure the ambient temperature is comfortable and you’re relaxed and feeling well.

Please remember that every finger is a little different from its counterparts. Even the same digits on different hands will slightly vary in girth. Your dominant hand is going to be a tad larger than the other one. Therefore, if you’d like to get a ring for the right middle finger, you can’t count on the measurement taken on your left side.

Finally, besides your own fingers, you should consider the type of ring you’re in the market for. If you have your eye on a model with a wide shank (6 mm or more), it will sit tighter than thin models. To ensure you won’t get a ‘muffin top’ when wearing such a ring, always add half a size to what a ring size chart shows you.