Topics
Ring Sizing
How To Measure Ring Sizes
- Measure the finger size at the end of the day when the finger is largest (like sizing shoes).
- Don’t measure the finger size when the hands are cold – let them warm up to room temperature
- At Worth & Douglas we measure sizes to the leading edge.
- If the finished ring will be wider than the ring gauges, you may require a slightly larger size. A narrower ring may require a slightly smaller size.
- Start with a size that slides easily onto the finger, and then progressively try smaller sizes until you find one which will not go on. The correct size will be about a half to one size larger.
- If you don’t have ring gauges, you can wrap a piece of string or a strip of paper around the finger. Mark the point where the two ends meet and measure this length to get the circumference of the finger.
- The following table will convert the circumference to various ring size systems:
The following table will convert the circumference to various ring size systems:
| Comparison of Ring Sizes | Circum | Diameter | |||||
| USA | UK | Japan | Germany | France | Swiss | mm | mm |
| Ladies Sizes | |||||||
| 2.0 | D | 2 | 13.25 | 41.25 | 1.50 | 41.5 | 13.2 |
| 2.5 | E | 3 | 13.75 | 42.75 | 2.75 | 42.7 | 13.6 |
| 3.0 | F | 4 | 14.00 | 44.00 | 4.00 | 44.0 | 14 |
| 3.5 | G | 5 | 14.50 | 15.25 | 5.25 | 45.2 | 14.4 |
| 4.0 | H | 7 | 15.00 | 16.50 | 7.75 | 46.5 | 14.8 |
| 4.5 | I | 8 | 15.25 | 48.00 | 8.75 | 47.8 | 15.2 |
| 5.0 | J | 9 | 15.75 | 50.00 | 9.00 | 49.0 | 15.6 |
| 5.5 | K | 10 | 16.00 | 51.75 | 11.75 | 50.3 | 16 |
| 6.0 | L | 12 | 16.50 | 52.75 | 12.75 | 51.5 | 16.4 |
| 6.5 | M | 13 | 17.00 | 54.00 | 14.00 | 52.8 | 16.8 |
| 7.0 | N | 14 | 17.25 | 55.25 | 16.25 | 54.0 | 17.2 |
| 7.5 | O | 15 | 17.75 | 56.50 | 16.50 | 55.3 | 17.6 |
| 8.0 | P | 16 | 18.00 | 57.75 | 17.75 | 56.6 | 18 |
| 8.5 | Q | 17 | 18.50 | 58.00 | 19.00 | 57.8 | 18.4 |
| 9.0 | R | 18 | 19.00 | 60.00 | 20.25 | 59.1 | 18.8 |
| Gents Sizes | |||||||
| 9.5 | S | 19 | 19.50 | 61.25 | 21.50 | 60.3 | 19.2 |
| 10.0 | T | 20 | 20.00 | 62.00 | 22.50 | 61.6 | 19.6 |
| 10.5 | U | 22 | 20.25 | 63.25 | 23.00 | 62.8 | 20 |
| 11.0 | V | 23 | 20.75 | 65.00 | 24.00 | 64.1 | 20.4 |
| 11.5 | W | 24 | 21.00 | 66.0 | 26.00 | 65.3 | 20.8 |
| 12.0 | X | 25 | 21.25 | 67.50 | 27.50 | 66.6 | 21.2 |
| 12.5 | Y | 26 | 21.75 | 68.75 | 28.75 | 67.8 | 21.6 |
| 13.0 | Z | 27 | 22.00 | 69.00 | 30.00 | 69.1 | 22 |
| 13.5 | Z + 1 | - | - | - | - | - | - |
| 14.0 | Z + 2 | - | - | - | - | - | - |
| 14.5 | Z + 3 | - | - | - | - | - | - |
Formulae
AU, NZ and UK size = (circumference in mm – 36.667) x .8085
1 = A, 2 = B, etc
USA size = (circumference in mm – 36.107) x .3862
Singapore & Europe size = circumference in mm
Japan size = (circumference in mm – 39.7946) x .9549
How do I correctly measure a customer’s finger size?
When measuring a customer’s finger size you must be aware of the width of the ring sizer you are using.
When a customer is purchasing a 3mm wide ring and you are using a 3mm wide ring sizer, the size remains that which was measured.
If you are using a 3mm wide ring sizer but the ring purchased is 5mm wide, then you must add half a size for every 2mm variance in width.
Eg. 3mm wide ring sizer, customer measures size R
Ring being ordered is 3mm wide
Order product in size R
Eg. 3mm wide ring sizer, customer measures size R
Ring being ordered is 5mm wide
Order product in size R ½
Eg. 3mm wide ring sizer, customer measures size R
Ring being ordered is 7mm wide
Order product in size S
Remember our rings are sized to the leading edge and a wider “Comfort Curve™” ring appears slightly larger because the centre of the ring touches the ring stick first.