How to Measure Your Ring Size - How Should a Ring Fit
How to Measure Your Ring Size - Find Your Ring Size at Home
We feel ring sizing should be straightforward. No need for advanced tools to determine your ideal fit — just common household items. Choose the method that suits you best and align your measurement with our chart.
How a Ring Should Fit
The ideal fit slides over your knuckle with slight resistance and rests snugly without pinching. It should be easily removable but not too loose.
How to Measure Your Ring Size - Sizing Tips
The evening is the ideal time to measure, since fingers tend to be a bit larger by the end of the day, giving a more accurate fit. Keep band width in mind—wider bands feel tighter, so go up half a size for anything over 4mm. If your knuckle is bigger than the base of your finger, measure both and choose a size in between. When in doubt, size up—it’s much easier to adjust a slightly loose ring than one that’s uncomfortably tight.
Method 1: The String or Paper Test
What you’ll need:
- A strip of paper, string, or floss
- A pen
- A ruler (millimeters are best)
Steps:
- Wrap the paper or string around the base of your finger.
- Mark the point where the ends overlap.
- Lay it flat and measure the length in millimeters.
- Compare the number to our size chart to find your ring size.
| Ring Size (US) | Diameter (mm) | Circumference (mm) |
|---|---|---|
| 4.00 | 15.30 | 48.10 |
| 4.25 | 15.40 | 48.40 |
| 4.50 | 15.50 | 48.70 |
| 4.75 | 15.60 | 49.00 |
| 5.00 | 15.70 | 49.30 |
| 5.25 | 15.95 | 50.00 |
| 5.50 | 16.20 | 50.70 |
| 5.75 | 16.35 | 51.25 |
| 6.00 | 16.50 | 51.80 |
| 6.25 | 16.75 | 52.60 |
| 6.50 | 17.00 | 53.40 |
| 6.75 | 17.15 | 53.85 |
| 7.00 | 17.30 | 54.30 |
| 7.25 | 17.70 | 55.55 |
| 7.50 | 18.10 | 56.80 |
| 7.75 | 18.15 | 57.00 |
| 8.00 | 18.20 | 57.20 |
| 8.25 | 18.38 | 57.75 |
| 8.50 | 18.55 | 58.30 |
| 8.75 | 18.73 | 58.85 |
| 9.00 | 18.90 | 59.40 |
| 9.25 | 19.10 | 60.03 |
| 9.50 | 19.30 | 60.66 |
| 9.75 | 19.55 | 61.44 |
| 10.00 | 19.80 | 62.20 |
| 10.25 | 20.05 | 62.98 |
| 10.50 | 20.30 | 63.76 |
| 10.75 | 20.45 | 64.21 |
| 11.00 | 20.60 | 64.70 |
| 11.25 | 20.83 | 65.43 |
| 11.50 | 21.05 | 66.12 |
| 11.75 | 21.18 | 66.50 |
| 12.00 | 21.30 | 66.90 |
| 12.25 | 21.60 | 67.84 |
| 12.50 | 21.90 | 68.78 |
| 12.75 | 22.05 | 69.25 |
| 13.00 | 22.20 | 69.70 |
| 13.25 | 22.40 | 70.33 |
| 13.50 | 22.60 | 70.96 |
| 13.75 | 22.80 | 71.59 |
| 14.00 | 23.00 | 72.30 |
| 14.25 | 23.20 | 72.93 |
| 14.50 | 23.40 | 73.56 |
| 14.75 | 23.60 | 74.19 |
| 15.00 | 23.80 | 74.80 |
| 15.25 | 24.00 | 75.45 |
| 15.50 | 24.20 | 76.10 |
| 15.75 | 24.40 | 76.75 |
| 16.00 | 24.60 | 77.40 |
Method 2: Measure a Ring You Already Own
What you’ll need:
- A ruler or caliper
- A ring that fits comfortably
Steps:
- Place your ring on a flat surface.
- Measure the inside diameter straight across in millimeters.
- Match that measurement to the chart below.
Method 3: Use Our Printable Ring Sizer
What you’ll need:
- A printer (set to 100% scale)
- Scissors
Steps:
- Print our FDJ Ring Sizer & Chart.
- Cut along the outline to create a paper sizer.
- Wrap the paper around your finger and read the number those lines up.
Ring Size Conversion Chart
| Ring Size (US) | Diameter (mm) | Circumference (mm) |
|---|---|---|
| 4 | 15.3 | 48.1 |
| 5 | 15.7 | 49.3 |
| 6 | 16.5 | 51.8 |
| 7 | 17.3 | 54.3 |
| 8 | 18.2 | 57.2 |
| 9 | 18.9 | 59.4 |
| 10 | 19.8 | 62.2 |
| 11 | 20.6 | 64.7 |
| 12 | 21.3 | 66.9 |