Ring Size Guide
Finding the right ring size matters, especially when buying a diamond ring online. This guide walks you through how to measure your ring size at home, with a conversion chart across US, UK, and EU sizing systems.
How to Measure Your Ring Size at Home
Method 1: Use a ring that already fits
Take a ring you already wear comfortably on the correct finger. Measure the inside diameter — edge to edge across the inner circle — in millimeters using a ruler, and match it to the chart below.
Method 2: String or paper strip
Wrap a strip of paper or a piece of string snugly around the base of your finger. Mark where the ends meet, then measure that length against a ruler in millimeters. This gives you your circumference measurement.
Tips for an Accurate Measurement
- Measure at the end of the day, when fingers are typically at their largest.
- Avoid measuring when your hands are cold — cold fingers measure smaller than they really are.
- Measure two or three times and use the most consistent result.
- If you're between two sizes, it's generally safer to size up.
Ring Size Conversion Chart
| US Size | UK Size | EU Size | Diameter (mm) | Circumference (mm) |
|---|---|---|---|---|
| 4 | H | 46.5 | 14.8 | 46.5 |
| 4.5 | I | 47.8 | 15.3 | 47.8 |
| 5 | J 1/2 | 49.1 | 15.7 | 49.3 |
| 5.5 | K 1/2 | 50.3 | 16.1 | 50.6 |
| 6 | L 1/2 | 51.5 | 16.5 | 51.9 |
| 6.5 | M 1/2 | 52.8 | 16.9 | 53.1 |
| 7 | N 1/2 | 54.1 | 17.3 | 54.4 |
| 7.5 | O 1/2 | 55.3 | 17.7 | 55.7 |
| 8 | P 1/2 | 56.6 | 18.1 | 57.0 |
| 8.5 | Q 1/2 | 57.8 | 18.5 | 58.3 |
| 9 | R 1/2 | 59.1 | 18.9 | 59.5 |
| 9.5 | S 1/2 | 60.3 | 19.4 | 60.8 |
| 10 | T 1/2 | 61.6 | 19.8 | 62.1 |
Sizes can vary slightly between manufacturers. This chart is a reliable starting point — our team can help confirm your exact size before your order ships.
Still Not Sure? We'll Help.
Because every ring is made to order, we don't sell by a fixed size dropdown — instead, we confirm your exact size with you directly before your piece is crafted. Once you have a measurement using the methods above, reach out to our team at Info@VinsaJewels.com and we'll help you finalize the right size before your order ships. You're also welcome to get sized at a local jeweler for extra confidence.
Ready to find your ring? Explore our Rings collection.