Japanese Ring Size to US Size Conversion Chart


Before buying a Japanese ring online, the first thing you need to do is determine your finger size so that you can simply select your desired ring type and size. Janbox will show you how to determine your Japanese ring size to US size and how to measure your ring size so that you may buy a ring with total confidence.

japanese ring size conversion

I. Japanese Ring Size to US Size Conversion Chart

There are numerous different measurement systems for jewelry ring sizes around the world:

  • Ring sizes with fractions 14 and 12 are regularly used in the United States and Canada. An increment of 0.032 inches (0.8128 mm) in diameter, or about 1/10th of an inch (0.1005 in or 2.55 mm) in inner circumference, equals a size increase. In general, using fractions 14 and 12 to calculate ring sizes has nothing to do with standard measurement systems. As a result, the finger size may differ from that of the ring, depending on the time of day, occupation, and other activities that cause the finger to grow or shrink. So, unless the user needs an accurate measurement for a specific ring kind, that measurement doesn’t make much sense in most circumstances.
  • Ring sizes in Europe (including Ireland and the United Kingdom) are numerical, with a measurement of 12 being the standard.
  • Ring sizes are alphabetical in Ireland, the United Kingdom, and Australia, with a measurement of 12 inches.
  • Ring sizes are numeric in Japan, and only integers are utilized.
  • Ring sizes in Switzerland are measured in numbers, with 14 and 12 being the most common.
  • Ring sizes in Germany are determined by the inner circumference, which is measured in millimeters. (in the style of ISO). ISO 8653:1986, which defines the standard ring size as the inner circumference in millimeters, is the ISO standard for ring sizes.

The table below contains more information about converting ring sizes between Japanese ring size conversion and US ring size conversion.

Ring Diameter (MM) USA/Canada Japan
14.0 mm. 3 4
14.4 mm.
14.8 mm. 4 7
15.2 mm. 8
15.6 mm. 5 9
16.0 mm. 10½
16.5 mm. 6 12
16.9 mm. 13
17.3 mm. 7 14
17.7 mm. 15
18.2 mm. 8 16
18.6 mm. 17
19.0 mm. 9 18
19.4 mm. 19
19.8 mm. 10 20
20.2 mm. 10½ 22
20.6 mm. 11 23
21.0 mm. 11½ 24
21.4 mm. 12 25
21.8 mm. 12½ 26
22.2 mm. 13 27
22.6 mm. 13½

II. How to measure your finger to calculate the ring size

When it comes to jewelry, the ring is the item that needs to be altered the most to fit the size of the user’s hand. When you wear a well-fitting ring, you will feel more confident. If you are unable to visit your preferred store, you can complete your ring size measurement with a thread and a piece of paper by following these simple instructions:

  • Step 1: Wrap a piece of paper or thread around the finger on which you want to wear the ring. 
  • Step 2: Wrap the area on the finger where you want to wear the ring.
  • Step 3: Draw a line through the intersection.
  • Step 4: Using the ruler, measure the length of the sheet of paper you just made, then multiply the result by 3.14 to get the ring’s diameter.
  • Step 5: Finally, compare the measured ring diameter to the standard ring size table’s diameter size. You will be informed of your ring size.

japanese ring size to us

Note: The size of your hands can change based on the time of day or the weather. For example, the hand size may be lower in the morning because the hands are not yet warm and the temperature is cooler; the hand size may be larger at the end of the day owing to the day’s activities. For the most accurate results, you should measure your hand size 3-4 times at different times of the day. If your ring size is between two digits, go with the bigger one. If your knuckles are large, measure the circumference near the joint (not above the joint) so that the ring is easy to enter and does not slip off while you wear it.

>>Read more: The best Japanese ring brand.

III. Where to buy Japanese rings to easily choose the size

When you have no idea to purchase Japanese rings or find out the Japanese ring sizes to US sizes, Janbox will assist you. Take a look at the below reasons why you should try Janbox to get your ring size even US ring size:

  • Convenience

You may shop on Janbox as if you were living and experiencing Japan with just a few mouse clicks. You can also order a large number of rings at once, which saves you a lot of time. Aside from that, you can estimate and calculate the cost of international shipping without the help of our experts.

  • Fast delivery

You’ll just have to wait 9-12 days for your items to arrive, thanks to a well-developed international shipping infrastructure.

  • Cost minimization

Janbox will help you save money by cutting expenses and making customs clearance and tax procedures easier. Now all you have to do is place an order and wait for your products to arrive.

  • Official papers and invoices are fully provided

Customers can utilize Janbox’s global shopping service to purchase things that come with complete and accurate invoices and documentation. When products are returned home, professional invoices accompany them, ensuring prestige and proving the company’s commitment to customers.

  • Enthusiastic and attentive customer care center

Janbox aids and educates shoppers when it comes to picking high-quality products and merchants. All of your queries will be answered by our eager and knowledgeable customer care team. Consulting and support services are accessible 24 hours a day, seven days a week, outside of office hours. Furthermore, if there is a possibility of counterfeit, imitation, incorrect, or missing items,… Janbox will assist customers who wish to file a complaint with the supplier. Based on the seller’s complaint and return policies, the client will be treated most positively.

IV. Conclusion

If you know the above Japanese ring size conversion table, you will be able to master the conversion of Japanese ring size to US size. Hopefully, shopping and selecting the ring you want will become easier.