2 Ways to Measure Your Ring Size
Choose the method that works best for you.
Printable Ring Sizer
Recommended for best accuracy
Measure with a Paper Strip
No printer needed
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EASY AT HOME
Simple methods to measure your size accurately.
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INTERNATIONAL SIZES
US, UK, EU and mm conversion charts.
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PERFECT FIT
Tips to help you find the ideal comfort.
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CONFIDENT SHOPPING
Get the right size the first time for your perfect ring.
RING SIZE GUIDE
⚠️ We strongly recommend measuring your ring size at a local jewelry store whenever possible. This is the most accurate way to avoid resizing or ordering the wrong size — especially for custom jewelry. At-home ring sizing should only be used when visiting a jeweler is not possible.
Before You Measure
Timing and Temperature
- Finger size can change depending on temperature and time of day. For the most accurate result, measure your finger in the evening when your hands are at a normal temperature.
Wide Rings
- Wide rings fit differently. If you are choosing a wide band ring (approximately 8 mm or wider), we usually recommend ordering half a size larger, as wider rings tend to feel tighter on the finger.
A Note on Knuckles
- If your knuckle is significantly wider than the base of your finger, we recommend measuring both areas and choosing a size right in between. The ring needs to slide over the knuckle but should not be too loose on your finger.
How to Measure Ring Size with a Paper Strip
Follow these simple steps to measure your ring size at home using a thin strip of paper and a ruler.
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Step 1 — Wrap the Paper Strip
Cut a thin paper strip approximately 10–12 mm wide. Wrap it around the base of your finger, where the ring will sit. The strip should lie flat and fit comfortably.
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Step 2 — Mark the Overlap
Hold the paper strip firmly around your finger and mark the point where the paper overlaps. For best accuracy, keep the strip straight and do not measure over the knuckle.
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Step 3 — Measure the Length
Lay the paper strip flat and measure the marked length in millimeters. This measurement is your finger circumference. Compare it with the ring size chart below.
Convert Your Measurements to Ring Size
The measured paper length corresponds to the circumference of your finger.
Use your measured paper length to find the correct ring size in US, UK, EU and millimeters.
| Circumference (mm) | Inner Diameter (mm) | US | UK | EU |
|---|---|---|---|---|
| 47.1 | 15.0 | 4 | H½ | 47 |
| 48.2 | 15.3 | 4.5 | I½ | 48 |
| 49.3 | 15.7 | 5 | J½ | 49 |
| 50.5 | 16.1 | 5.5 | K½ | 50 |
| 51.8 | 16.5 | 6 | L½ | 52 |
| 53.1 | 16.9 | 6.5 | M½ | 53 |
| 54.4 | 17.3 | 7 | N½ | 54 |
| 55.6 | 17.7 | 7.5 | O½ | 55 |
| 56.9 | 18.1 | 8 | P½ | 57 |
| 58.1 | 18.5 | 8.5 | Q½ | 58 |
| 59.5 | 18.9 | 9 | R½ | 59 |
| 60.7 | 19.4 | 9.5 | S½ | 60 |
| 62.1 | 19.8 | 10 | T½ | 62 |
| 63.3 | 20.2 | 10.5 | U½ | 63 |
| 64.6 | 20.6 | 11 | V½ | 65 |
| 65.9 | 21.0 | 11.5 | W½ | 66 |
| 67.2 | 21.4 | 12 | X½ | 67 |
| 68.4 | 21.8 | 12.5 | Y½ | 68 |
| 69.7 | 22.2 | 13 | Z½ | 70 |
| 71.0 | 22.6 | 13.5 | Z+2 | 71 |
| 72.3 | 23.0 | 14 | Z+3 | 72 |
| 73.5 | 23.4 | 14.5 | Z+5 | 73 |
| 74.8 | 23.8 | 15 | Z+6 | 74 |
| 75.4 | 24.0 | 15.5 | Z+7 | 75 |
Need to Convert Your Ring Size?
Ring sizes can vary depending on the country and measurement system. If you already know your ring size in US, UK or EU format, use the international conversion chart below to find the equivalent size.
International Ring Size Conversion
At INDIGO Jewelry Atelier, we use the standard US ring size system for all custom rings and signet rings.
| US Size | UK Size | EU Size | Inner Diameter (mm) |
|---|---|---|---|
| 4 | H½ | 47 | 15.0 |
| 4.5 | I½ | 48 | 15.3 |
| 5 | J½ | 49 | 15.7 |
| 5.5 | K½ | 50 | 16.1 |
| 6 | L½ | 52 | 16.5 |
| 6.5 | M½ | 53 | 16.9 |
| 7 | N½ | 54 | 17.3 |
| 7.5 | O½ | 55 | 17.7 |
| 8 | P½ | 57 | 18.1 |
| 8.5 | Q½ | 58 | 18.5 |
| 9 | R½ | 59 | 18.9 |
| 9.5 | S½ | 60 | 19.4 |
| 10 | T½ | 62 | 19.8 |
| 10.5 | U½ | 63 | 20.2 |
| 11 | V½ | 65 | 20.6 |
| 11.5 | W½ | 66 | 21.0 |
| 12 | X½ | 67 | 21.4 |
| 12.5 | Y½ | 68 | 21.8 |
| 13 | Z½ | 70 | 22.2 |
| 13.5 | Z+2 | 71 | 22.6 |
| 14 | Z+3 | 72 | 23.0 |
| 14.5 | Z+5 | 73 | 23.4 |
| 15 | Z+6 | 74 | 23.8 |
| 15.5 | Z+7 | 75 | 24.0 |
Ring Size Calculator
Use this calculator to convert ring diameter to circumference or circumference to diameter. Enter one measurement and the other will be calculated automatically.
Measurements are approximate and rounded to one decimal place.