Ring Education
Find Your Ring Size
Printable Ring Size Guide
Blue Nile realizes that you may not know the ring size for a given finger, and we want to help. We provide a printable ring sizer that can help you determine your ring size. Prior to printing, ensure that page scaling is set to "none" on your print dialog box.
Other International Ring Sizers
(These documents are PDF files
and require Adobe Acrobat Reader. If you do not have Acrobat Reader download it for free.)
Measuring Your Finger
Your ring should fit your finger comfortably; snug enough so that it will not fall off, but loose enough to slide over your knuckle.
Finger size changes depending on the time of day and the weather. For best results measure your finger size:
- At the end of the day and when your fingers are warm (Fingers are smaller in the early morning and when cold.)
- Measure finger size 3 to 4 times to eliminate an erroneous reading.
Avoid using string or paper to measure ring size as these materials can stretch or twist, yielding an inaccurate measurement.
A Word About Ring Sizes
Please be aware that ring sizes shown on Blue Nile reflect ring sizes used in the US and Canada. To find your ring size, measure your finger and then use the International Ring Size Chart to convert your size to the corresponding US size. That is the size you should order.
For example, a ring size 7 in most Asian countries would be a US size 4. To obtain the correct size ring, you would order a US size 4.
Tips for Buying the Ring as a Surprise
Ask your significant other’s friends or mother if they know her finger size.
Borrow his/her ring (from the correct finger) and use the ring measurements above to determine its size.
Find Your Perfect Ring
Wedding Ring GuideThis guide details all you'll need to know about choosing women's and men's wedding rings.
Free Resizing
Blue Nile provides complimentary resizings on all customized engagement rings during the first year. Simply phone a Diamond & Jewelry Consultant at 001800 2200 2100 to arrange for your free resize.
Diamond and gemstone eternity rings are designed with a specific number of gemstones surrounding the ring for each size. Due to this design, we can't resize eternity rings. We are happy to exchange your ring for another size. Gemstones, diamonds and/or the price may increase or decrease based on the new size.
International Ring Size Chart
| Circumference (mm) | Diameter (mm) | UK, Europe, & Australia | United States & Canada | CN/SG/JP | HK | Switzerland |
|---|---|---|---|---|---|---|
| 44.2 | 14.1 | F | 3 | 4 | 6 | 4 |
| 44.8 | 14.3 | F½ | 5 | 5¼ | ||
| 45.5 | 14.5 | G | 3½ | 7.5 | ||
| 46.1 | 14.7 | G½ | 6 | 6½ | ||
| 46.8 | 14.9 | H | 4 | 7 | 9 | |
| 47.4 | 15.1 | H½ | 7¾ | |||
| 48.0 | 15.3 | I | 4½ | 8 | 10 | |
| 48.7 | 15.5 | J | 9 | |||
| 49.3 | 15.7 | J½ | 5 | 9 | 11 | |
| 50.0 | 15.9 | K | 10 | |||
| 50.6 | 16.1 | K½ | 5½ | 10 | 12 | |
| 51.2 | 16.3 | L | 11¾ | |||
| 51.9 | 16.5 | L½ | 6 | 11 | 13 | 12¾ |
| 52.5 | 16.7 | M | 12 | |||
| 53.1 | 16.9 | M½ | 6½ | 13 | 14.5 | 14 |
| 53.8 | 17.1 | N | ||||
| 54.4 | 17.3 | N½ | 7 | 14 | 16 | 15¼ |
| 55.1 | 17.5 | O | ||||
| 55.7 | 17.7 | O½ | 7½ | 15 | 17 | 16½ |
| 56.3 | 17.9 | P | ||||
| 57.0 | 18.1 | P½ | 8 | 16 | 17¾ | |
| 57.2 | 18.2 | 18 | ||||
| 57.6 | 18.3 | Q | ||||
| 58.3 | 18.5 | Q½ | 8½ | 17 | 19 | |
| 58.9 | 18.8 | R | 19 | |||
| 59.5 | 19.0 | R½ | 9 | 18 | 20.5 | |
| 60.2 | 19.2 | S | 20¼ | |||
| 60.8 | 19.4 | S½ | 9½ | 19 | 22 | |
| 61.4 | 19.6 | T | 21½ | |||
| 62.1 | 19.8 | T½ | 10 | 20 | 23 | |
| 62.7 | 20.0 | U | 21 | |||
| 63.4 | 20.2 | U½ | 10½ | 22 | 24 | 22¾ |
| 64.0 | 20.4 | V | ||||
| 64.6 | 20.6 | V½ | 11 | 23 | 25 | |
| 65.3 | 20.8 | W | 25 | |||
| 65.9 | 21.0 | W½ | 11½ | 24 | 26 | |
| 66.6 | 21.2 | X | ||||
| 67.2 | 21.4 | X½ | 12 | 25 | 27.75 | 27½ |
| 67.8 | 21.6 | Y | ||||
| 68.5 | 21.8 | Z | 12½ | 26 | 28¾ | |
| 69.1 | 22.0 | Z½ | ||||
| 69.7 | 22.2 | 13 | 27 | 30 | ||
| 70.4 | 22.4 | Z+1 | ||||
| 71.0 | 22.6 | 13½ |

