UK Ring Size Chart: Letters, Measurements and Conversions

Imagine you are shopping for a ring and you found just the perfect one. However, there is one important step before you add it to the cart: select the size. If you are in the UK, the measurements may appear in letters; if you are in the US, they may appear in numbers.

So what is your ring size in the UK, and how do you convert your ring size from the UK to US? Easy, with the help of this guide!

Table of Content

• UK Ring Size Chart (A to Z+)
• UK Ring Sizes in mm and cm
• UK to US Ring Size Conversion
• How to Find Your UK Ring Size at Home
• How to Find Their Ring Size in Secret
• Average Ring Sizes in the UK
• How Should a Ring Fit?
• 5 Common Ring Sizing Mistakes
• Can a Ring Be Resized?

What Is Ring Size in the UK?

UK ring size is based on the diameter and the inner circumference of the ring. 

Circumference: The circumference of the ring is the measurement of the edge of the ring. For ring sizing, we consider the inner circumference of the ring.

Diameter: The diameter of the ring refers to the width of the ring from one edge to another through the center of the ring.

UK ring size chart (A to Z+)

Here is the UK ring size chart that will help you understand your UK ring size.

Larger ring sizes are calculated as Z+1, Z+2, and so on. For sizes that fall in between, the letter sizes are measured in fractions such as K½. Also, it is important to note that this chart gives approximate sizing. For accurate sizing, we recommend getting your finger sized by a professional.

Ring sizes in mm and cm

While measuring your finger for the ring, pay attention to the unit of measurement, whether you are measuring your ring size in mm or cm. If you are measuring your ring sizes in cms, here are the most common sizes and their UK size.

 

UK to US Ring Size Conversion Chart

If the UK ring size is M, then in the EU it is 52.5, and in the US it will be 6.25. Confused? Well, let’s untangle this.

UK letters to US numbers

The UK uses the alphabet to represent sizes, while the US uses numbers. When shopping for a ring online, you can come across either sizing, so having a UK to US ring size conversion chart handy may be helpful.

UK to EU

If you know the inner circumference of your ring, then figuring out the EU size is pretty easy. Why? Because in Europe, the ring size is determined by the inner circumference in mm. If you refer to the UK ring size chart, you will notice that the circumference for size M is 52.5; that makes 52.5 the EU ring size.

Ireland, Australia and Japan

Once you have found out your ring size as per the UK and US ring sizing guides, finding your ring size as per other countries becomes a cakewalk.

Ireland and Australia commonly use an alphabetical system for ring sizing, the same as the UK. So if your ring size on the UK ring sizing chart is G, then it is G in Australia and Ireland as well.

Japan follows numerical ring sizing guidelines, the same as the US. So if your ring size in the US is 5, then it is 5 in Japan as well.

How to Find Your UK Ring Size at Home

You can find out your ring size using the UK ring size chart. However, if you do not have your ring diameter or inner circumference and you are wondering how to measure ring size in the UK, here are four ways to find your UK ring size at home.

Measure a ring that fits

If you have a ring that fits, then this is the best way to find out your UK ring size. Use a ruler to measure the diameter of the ring from one inside edge to the other inside edge in millimeters. Now that you have the size, simply use the UK ring size chart to find the size.

Paper strip

Wrap a string, piece of paper, or fabric around the base of the finger on which you plan to wear your ring. Make a mark where the string or paper overlaps. Measure the length in millimeters and, using a conversion chart, spot your size.

Printable ring sizer

A printable ring sizer is basically a paper measuring tool that you can print and wrap around your finger. This sizer is already marked with sizing. Wrap the paper around the base of your finger and note the point where it overlaps. The size marked at the overlapping point is your approximate ring size.

Get sized by a jeweller

A jeweller can measure using professional tools and find the right size for your ring. While this can’t be done at home, it gives the most accurate measurement for a comfortable fit.

How to Find Their Ring Size in Secret

Some surprises are better not to be revealed until the perfect moment. So here’s how you can find their ring size in secret.

• Peek into their jewellery box for a ring that they own. Use it to determine the size. You can use a scale at home or take the ring to a jeweller to determine its size.

• Ask their family or friends if they know their ring size.

• Choose a jeweller that offers resizing so you can buy the approximate ring size and get it resized accurately in case of a mismatch.

• Measure their finger while they are asleep using a piece of string. This method is a bit risky but may work if they are a heavy sleeper.

What are the Average Ring Sizes in the UK

The average ring size in the UK differs according to gender. For women, the average ring size sits between L and M, while for men, T is the average ring size.

It is recommended not to buy a ring based on the average size. Average sizes are only general estimates based on a broad group of people, and an individual's ring size can vary significantly depending on their finger shape, knuckle size, and hand measurements. For a comfortable fit, buy the ring based on the person’s actual ring size.

How Should a Ring Fit?

A ring should sit snugly on the base of the finger, but not too tight. Here are some points that one must consider to ensure a comfortable fit.

• The knuckle is broader than your finger, so the ring should be large enough to comfortably slide down the knuckle but snug enough so it does not slip off.

• Take the size of the band into consideration. Wide bands may feel tighter than slim ones. You might need a slightly larger size in case of wide bands. It's better to try on a ring with a similar band to find the most comfortable fit.

• If you fall between sizes, ask the jeweller if the ring can be crafted in your size.

• If the ring feels too tight or loose, it is better to get it resized to avoid the discomfort or the risk of losing the ring. Friendly Diamonds offers free resizing for up to 12 months from the purchase.

5 Common Ring Sizing Mistakes

Depending on Old Measurements

The size of the finger may change over the years. It may get bigger or smaller due to physical changes in your body. It is better to get your finger sized if it hasn't been sized for a long time instead of depending on old measurements.

Ignoring the Band Size

The band size affects the comfort of the ring. A wider band sits more snugly compared to the regular-sized band. If the band is wider than 2 mm, consider getting a slightly larger ring size.

Going for the Approximate Size

At-home measuring methods will not give an accurate ring size. The slight difference can cause the ring to be too tight or loose. It is recommended to get the sizing from a professional.

Ignoring the Ring Style

While most rings can get resized, rings with diamonds running down the shank, such as eternity bands, may be difficult to resize. If you are purchasing a ring with carved bands or channel-set diamonds, get the sizing accurately from a professional jeweller. 

Not Considering the Time of Day

During the day, cold weather, heat, and exercise can cause your fingers to swell or shrink. Sizing the finger later in the day will give you accurate measurements.

Can a Ring Be Resized?

The simple answer is yes. Most rings can be resized. However, rings with carved bands, pavé-set, or channel-set diamonds on the shank, or intricate details throughout the ring, may be difficult to resize. Also, if the ring is engraved, resizing can affect how the ring looks. It is best to get the ring in the correct size when buying. Be sure to ask the jeweller about their ring resizing policies in advance.

At Friendly Diamonds, we offer complimentary resizing up to 12 months from the purchase.