RING SIZE GUIDE
FIND YOUR FIT AT HOME
PRINTABLE RING SIZER
PRINT AT 100% / ACTUAL SIZE, not "fit to page". Then check the ruler below measures exactly 50 mm before using the sizer.
Paper strip: cut out the strip, wrap it around the base of your finger, and mark where the end meets the scale. The number at the mark is your US size; halfway between two numbers is a half size.
Circle chart: lay a ring that fits you well on the circles. Your size is the circle that lines up with the inside edge of the ring. Each circle is the true inside diameter.
SIZE CHART
| US | UK | EU / ISO | Japan | Diameter mm | Circumference mm |
|---|---|---|---|---|---|
| 4 | H½ | 47 | 7 | 14.9 | 46.8 |
| 4.5 | I½ | 48 | 8 | 15.3 | 48.0 |
| 5 | J½ | 49 | 9 | 15.7 | 49.3 |
| 5.5 | K½ | 51 | 10 | 16.1 | 50.6 |
| 6 | L½ | 52 | 12 | 16.5 | 51.9 |
| 6.5 | M | 53 | 13 | 16.9 | 53.1 |
| 7 | N½ | 54 | 14 | 17.3 | 54.4 |
| 7.5 | O½ | 56 | 15 | 17.7 | 55.7 |
| 8 | P½ | 57 | 16 | 18.1 | 57.0 |
| 8.5 | Q | 58 | 17 | 18.5 | 58.2 |
| 9 | R½ | 59 | 18 | 18.9 | 59.5 |
| 9.5 | S½ | 61 | 19 | 19.4 | 60.8 |
| 10 | T½ | 62 | 20 | 19.8 | 62.1 |
| 10.5 | U½ | 63 | 22 | 20.2 | 63.3 |
| 11 | V½ | 65 | 23 | 20.6 | 64.6 |
| 11.5 | W½ | 66 | 24 | 21.0 | 65.9 |
| 12 | Y | 67 | 25 | 21.4 | 67.2 |
| 12.5 | Z | 68 | 26 | 21.8 | 68.5 |
| 13 | Z+1 | 70 | 27 | 22.2 | 69.7 |
| 13.5 | Z+2 | 71 | 28 | 22.6 | 71.0 |
| 14 | Z+3 | 72 | 29 | 23.0 | 72.3 |
TIPS
- Measure at the end of the day, when your fingers are warm and at their largest.
- For wide or chunky bands like the Plus Ring, go up a half size.
- A good fit slides over the knuckle snugly and does not spin on the finger.
EXCHANGES
One free size exchange within 30 days. If your ring doesn't fit, send it back and we'll ship the right size to you for free. The ring must be unworn and undamaged. Full details are in our FAQ.
PERSONAL HELP
Email jewelry@lucasplus.com or DM @lucasplusjewelry and we'll help you find your size.