How to measure ring size
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Do you want to buy a ring but are putting off purchasing it because you don't know the size?
This page will show you how to measure your ring size.
How can you measure ring size?
- Have it measured at the store you buy it from.
- Use a commercially available ring gauge
- use paper or thread
- measure your ring
Have it measured at the store you buy it from.
This is the most reliable and recommended method.
After having your ring measured properly at a store, try on the ring you plan to purchase (or, if you ordered it, a ring with a design similar to the finished product).
Use a commercially available ring gauge
This method uses a commercially available tool called a ring gauge to measure ring size.
This method is recommended for those who want to easily measure at home.
A ring gauge is a product that comes with a set of rings from sizes 1 to 30, and you can check the size by putting it on your finger.
use paper or thread
This is a method for those who don't want to spend money.
However, this method is not recommended as it is difficult to measure accurately and large errors can occur depending on the measurer's use of.
Please keep in mind that this is just a rough guide to the size.
What to prepare and how to measure
- non-stretch paper or thread
- ruler or tape measure
First, wrap a piece of non-stretch paper or thread around the finger you want to measure.
Next, mark the part you wrapped around your finger, measure the circumference of your finger, and check the size using the table below.
| Japanese size (JCS standard) | Inner diameter (mm) | International size (ISO standard) |
| No. 1 | 40.8 | 41 |
| No. 2 | 41.9 | 42 |
| No. 3 | 42.9 | 43 |
| No. 4 | 44.0 | 44 |
| No. 5 | 45.0 | 45 |
| No. 6 | 46.1 | 46 |
| No. 7 | 47.1 | 47 |
| No. 8 | 48.2 | 48 |
| No. 9 | 49.2 | 49 |
| No. 10 | 50.3 | 50 |
| No. 11 | 51.3 | 51 |
| No. 12 | 52.4 | 52 |
| No. 13 | 53.4 | 53 |
| No. 14 | 54.5 | 54 |
| No. 15 | 55.5 | 55 |
| No. 16 | 56.5 | 56 |
| No. 17 | 57.6 | 57 |
| No. 18 | 58.6 | 58 |
| No. 19 | 59.7 | 59 |
| No. 20 | 60.7 | 60 |
| No. 21 | 61.8 | 61 |
| No. 22 | 62.8 | 62 |
| No. 23 | 63.9 | 63 |
| No. 24 | 64.9 | 64 |
| No. 25 | 66.0 | 65 |
| No. 26 | 67.0 | 66 |
| No. 27 | 68.0 | 67 |
| No. 28 | 69.0 | 68 |
| No. 29 | 70.0 | 69 |
| No. 30 | 71.0 | 70 |
measure your ring
This is a method to measure your ring size based on the ring you normally wear.
Check the size by passing the ring through a commercially available tool called a "sizing stick."
It is not uncommon for rings that are the same and that are commonly worn to have different sizes depending on the design (mainly thickness and width).
When using this method, try to measure with a ring with a design that is as close as possible to the ring you want to purchase.
Even if you measure the size, it will inevitably swell due to blood flow over time.
So, of course, the best thing to do is to have it properly measured at the store you are purchasing it from.
It would be a shame to measure yourself or measure incorrectly and end up buying a ring that doesn't fit.
In recent years, specialized tools have become available online, so if you can't go to a store, you should purchase specialized tools.