Finding the perfect ring size is easy. Below you’ll find several simple methods to determine your size accurately.
If you already know your ring size or have an existing ring, you can start with the chart below.
1. Find Your Size Using Our Conversion Chart
If you already know your ring size in another system (US, EU, or by diameter), use the chart below to find the correct IVdesign size.
| IVdesign Size (US) | Inside Diameter (mm) | EU Size (Circumference mm) | UK Size |
|---|---|---|---|
| 4 | 14.0 mm | 44 | H |
| 5 | 15.0 mm | 49 | J |
| 6 | 16.0 mm | 52 | L |
| 7 | 17.0 mm | 54 | N |
| 8 | 18.0 mm | 57 | P |
| 9 | 19.0 mm | 60 | R |
| 10 | 20.0 mm | 62 | T |
If your measurement falls between two sizes and there is no in-between size available, we recommend choosing the larger size for a more comfortable fit.
2. Measure With Your Current Ring – Printable Ring Size Guide (PDF)
Download and print our ring size guide at 100% scale (do not use “Fit to page”).
Place your ring over the circles and match the inside edge of the ring to the closest circle.
Inside each circle, you will see the ring size that corresponds to our website sizing. Below it, you will also find the inside diameter in millimeters (mm), so you can double-check the measurement using a ruler.
Important: Measure the control bar on the page to make sure it is exactly 50 mm. If this measurement is not accurate, your ring size cannot be determined correctly.
Why this method is great:
This is the perfect option if you’re buying a ring as a gift—especially for partners or spouses and you want to keep it a surprise. Simply take a ring they already wear, place it on the guide, and you can get the correct size without guessing.
Download Ring Size Guide (PDF)
3. Use Our Printable Paper Ring Sizer
You can also download our printable paper ring sizer. Print it at 100% scale, cut it out, and follow the instructions on the page.
- Cut out the paper ring sizer.
- Wrap it snugly around the widest part of your finger.
- Insert the pointed end through the slit.
- Read the number that lines up with the slit — this is your ring size.
If your measurement falls between two sizes and there is no in-between size available, we recommend choosing the larger size for a more comfortable fit.
Download Paper Ring Sizer (PDF)
4. Use a Ring Size App (iOS & Android)
There are several free apps available for both iOS and Android that help you determine your ring size.
These apps allow you to place your ring directly on your phone screen and adjust the on-screen circle until it matches the inside of your ring.
Once you find the matching size in the app, simply use our conversion chart above to select the correct size on our website.
5. Measure Your Finger with Paper and a Ruler
If you don’t have a ring to measure, you can use a strip of paper or string:
- Cut a thin strip of paper.
- Wrap it around the base of your finger (not too tight, not too loose).
- Mark where the paper overlaps.
- Lay the paper flat and measure the length with a ruler in millimeters (mm).
- Use the chart below to find your ring size.
Inside Diameter (mm) to Ring Size Conversion
| Inside Diameter (mm) | IVdesign size (US) |
|---|---|
| 13.0 mm | 3 |
| 13.5 mm | 3.5 |
| 14.0 mm | 4 |
| 14.5 mm | 4.5 |
| 15.0 mm | 5 |
| 15.5 mm | 5.5 |
| 16.0 mm | 6 |
| 16.5 mm | 6.5 |
| 17.0 mm | 7 |
| 17.5 mm | 7.5 |
| 18.0 mm | 8 |
| 18.5 mm | 8.5 |
| 19.0 mm | 9 |
| 19.5 mm | 9.5 |
| 20.0 mm | 10 |
If your measurement falls between two sizes and there is no in-between size available, we recommend choosing the larger size for a more comfortable fit.