Ring size conversion Chart

How to measure your ring size

Using a measuring tape is the best and most accurate method to determine your ring size. For the best results, make sure to give enough space to accommodate your knuckle. Keep in mind that your fingers vary in size during the day depending on several factors, like temperature and humidity. Therefore, it is recommended to measure your finger at the end of the day, when it is likely the largest. Also, the same finger might differ in ring size for your left and right hand, make sure to measure the finger that you are planning to wear the ring on.

Place the measuring tape over your finger and pull it around into a circle.

Adjust the size of the circle, move it across your knuckles, and make sure it fits comfortably.

Take note of the measurements in millimeters and use the comparison chart or measurement guide on this page to find your ring size.

Why the correct ring size is important

When choosing your next ring it is very important to take some things into consideration.

Wearing or putting on a ring should never hurt, tingle or swell. One that’s too tight could actually cut off the blood circulation, preventing the skin from breathing, and that could cause serious damage. It doesn’t leave indent marks.

Not all materials that are used to make rings are easily adjustable, or at all!

Don’t be a Karen and choose a smaller ring just to impress your friends or even your fiancé! Pick the ring that fits you comfortable from the start

You have to be able to always take your ring off, twist your ring or even move it from side to side

If you are unsure of your ring size and our handy plan above does not work for you, go to any jewelry store in a mall and ask them to assist you in measuring your ring size

How rings are measured in South Africa

Various ring size units are used all over the world. South Africa and the United Kingdom use the same system, while ring sizes in Germany and France are measured on a different scale.

Our (South Africa’s) system is also used by Australia, Ireland and New Zealand. Ring sizes are indicated by letters of the alphabet with half sizes in between. Each half size up represents an increase of 0.75 mm of the ring’s inside circumference.

We have compiled an easy to understand table below that will show you the following data:

The ring diameter, The corresponding Letter to identify ring sizes in South Africa and a comparison to our unit and the American units of measurement. This chart also shows the circumference in mm

The different international ring measuring units

Every country has its own ring size chart. Here is a breakdown of the most common ring size systems.

United States

In the United States, a number chart is used. The numbers run from zero to sixteen and run in full, quarter, half, and three-quarter sizes. There are two elements that are measured: the inside diameter and the inside circumference. The US uses inches to measure, so the measurements mentioned refer to inches. A size 0 ring is 0.458 inches in diameter and 1.44 inches in inside circumference. A size 16 ring measures 0.97 inches in diameter and 3.05 inches in inside circumference.

South Africa, United Kingdom, Ireland, Australia, and New Zealand

An alphabetized system is used in South Africa, the UK, Ireland, Australia, and New Zealand. A size A ring is equivalent in size to a size 0.5 ring in American terms. The sizes come in full sizes (A) and half sizes (A ½). A size A ring, the smallest size, runs 12.04 mm in diameter and 37.8 mm in inside circumference. The largest size is a size Z4 ring, the only letter size that goes beyond the half size. It is equivalent in size to the American size 14 ½, six sizes smaller than America’s largest ring size. It measures 23.42 mm in diameter and 73.6 mm in inside circumference.

Japan, China, and South America

Like the United States, Japan, China, and South America use numbers to determine ring sizes. However, their system works quite differently. Numbers run from 1 to 27, but are equivalent to only some other international sizes. For instance, the smallest size is a 1, and is equivalent to a US size 1 (the fourth size) and a UK B (the third size.) It measures 12.45 mm in diameter and 39.1 mm in inside circumference. Size 27, the largest size, is comparable with a US size 13 and is somewhere in between a UK Z ½ and a Z2. America has fourteen more sizes larger than a 27, and the UK has four. A size 27 ring measures 22.2 mm in diameter and 69.7 mm in inside circumference.

Why there are no one standard for ring sizes

International Ring size conversion Chart

Ring Size to mm conversion image

More info on Sizing Jewelry

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