Finger Sizing Guide | Ring Size (Number) Conversion Chart
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SIZE CHECK
For those who are hesitant to order a ring online because they are unsure of their exact size, we provide a guide on how to easily measure your ring size at home using common items.
◆What you will need
Paper (cut into a strip), pen, ruler
▼Measurement Procedure
① Prepare a thin strip of paper and wrap it around your finger.
The key is to wrap it along the thickest joint (near the second knuckle) that the ring will pass over.
※To minimize error, wrap it snugly around your finger so there is no looseness.
② Mark the point where the paper overlaps after one full wrap with a pen.
To prevent errors, it is recommended to use a clearly visible colored pen to mark the spot.
③ Straighten the paper and measure the distance between the two marks with a ruler.
This measured length is your "finger circumference (ring inner circumference)."
④ Based on the calculated inner circumference value, please choose the closest ring size from the corresponding chart below.
While it is possible to measure with string or thread, the elasticity or twisting of the material itself can easily lead to errors. For more accurate measurement, we recommend using non-stretchable "paper."
◆Ring Size (Size Number) Conversion Chart
| Size | Inner Circumference (mm) |
|---|---|
| 5号 | 45.0 |
| 6号 | 46.1 |
| 7号 | 47.1 |
| 8号 | 48.2 |
| 9号 | 49.2 |
| 10号 | 50.3 |
| 11号 | 51.3 |
| 12号 | 52.4 |
| 13号 | 53.4 |
| 14号 | 54.5 |
| 15号 | 55.5 |
| 16号 | 56.5 |
| 17号 | 57.6 |
| 18号 | 58.6 |
| 19号 | 59.7 |
| 20号 | 60.7 |
| 21号 | 61.8 |
| 22号 | 62.8 |
| 23号 | 63.9 |
| 24号 | 64.9 |
| 25号 | 66.0 |
| 26号 | 67.0 |
| 27号 | 68.0 |
| 28号 | 69.0 |
◆Notes on Finger Size
The perceived thickness of your finger can change depending on your physical condition, the season, and the shape of the item you are wearing.
To prevent discrepancies in fit, please also check the following points.
Point ①: Changes due to time of day (swelling)
Due to changes in water metabolism and body temperature, human fingers can fluctuate by up to approximately 0.5 sizes within a single day.
For example, fingers tend to be thicker in the evening compared to the morning, and thinner in winter while prone to swelling in summer. Therefore, it is recommended to measure multiple times at different times of the day, such as morning and night.
Point ②: Ring shape and width
Thick, heavy rings have a larger surface area in contact with the skin and can feel constrictive when worn. Therefore, choosing a ring 1 to 2 sizes larger than usual can provide a more comfortable fit.
Conversely, rings with a rounded inner edge (Uchikomaru finish) slide on smoothly, so a true-to-size or slightly smaller fit tends to be more suitable.
