3 simple steps
An easy way to measure at home
You will need a narrow strip of paper, a pen and a ruler marked in millimeters.
- STEP 01
Wrap your finger
Wrap the paper comfortably around the spot where you will wear the ring, without folds or slack.
- STEP 02
Mark the overlap
Use a fine pen to mark exactly where the end of the paper meets the start.
- STEP 03
Measure the length
Measure from the end of the paper to your mark in millimeters, then find your size in the chart below.
KS Standard Ring Size Chart
Find the value closest to the inner circumference you measured, or the inner diameter of a ring you own.
| Ring size (KS) | Inner circumference | Inner diameter |
|---|---|---|
| No. 1 | 44mm | 13.0mm |
| No. 2 | 45mm | 13.3mm |
| No. 3 | 46mm | 13.6mm |
| No. 4 | 47mm | 14.0mm |
| No. 5 | 48mm | 14.3mm |
| No. 6 | 49mm | 14.6mm |
| No. 7 | 50mm | 15.0mm |
| No. 8 | 51mm | 15.3mm |
| No. 9 | 52mm | 15.6mm |
| No. 10 | 53mm | 16.0mm |
| No. 11 | 54mm | 16.3mm |
| No. 12 | 55mm | 16.6mm |
| No. 13 | 56mm | 17.0mm |
| No. 14 | 57mm | 17.3mm |
| No. 15 | 58mm | 17.6mm |
| No. 16 | 59mm | 18.0mm |
| No. 17 | 60mm | 18.3mm |
| No. 18 | 61mm | 18.6mm |
| No. 19 | 62mm | 19.0mm |
| No. 20 | 63mm | 19.3mm |
| No. 21 | 64mm | 19.6mm |
| No. 22 | 65mm | 20.0mm |
| No. 23 | 66mm | 20.3mm |
| No. 24 | 67mm | 20.6mm |
| No. 25 | 68mm | 21.0mm |
| No. 26 | 69mm | 21.3mm |
| No. 27 | 70mm | 21.6mm |
| No. 28 | 71mm | 22.0mm |
| No. 29 | 72mm | 22.3mm |
| No. 30 | 73mm | 22.6mm |
Values are general references for comparison and may vary by product and measuring method.
Six checks for a more accurate measurement
At normal body temperature
Fingers change size with temperature. Avoid measuring right after being very cold or very hot.
Measure in the afternoon
Fingers swell slightly as the day goes on, so a reading around 3 to 4 p.m. is the most reliable.
Check your knuckle
If your knuckle is larger, measure both the knuckle and the spot where the ring sits so it can slide over.
Repeat 2 to 3 times
Measure at different times of day, then go with the most frequent result or the average.
Allow for band width
A wide band feels tighter at the same size. Depending on the design, you may need 0.5 to 1 size larger.
Measure each hand
The same finger can differ between left and right hands, so measure the hand you will actually wear it on.
Common international size conversions
Standards vary by country and brand, so for rings bought abroad, check that brand’s own chart as well.
| Korea (KS) | US | Japan | Europe | Circumference |
|---|---|---|---|---|
| No. 7 | 4 | 7 | 46¾ | 50mm |
| No. 9 | 5 | 9 | 49 | 52mm |
| No. 11 | 6 | 11 | 51½ | 54mm |
| No. 13 | 7 | 13 | 54 | 56mm |
| No. 15 | 8 | 15 | 56½ | 58mm |
| No. 17 | 9 | 17 | 59 | 60mm |
Values are general references for comparison and may vary by product and measuring method.
