Ring Size Guide
Finding the perfect ring size is essential for comfort and style. Use this guide to understand ring sizes, how to measure your finger accurately, and tips to ensure the best fit.
Please note: BY TONIN currently offers size O (US 7) only, which is the most common and versatile ring size for women. We understand that every hand is unique, so we’re excited to expand our range with more sizes very soon to ensure the perfect fit for everyone.
WOMEN'S RING SIZE GUIDE
| UK SIZE | US SIZE | DIAMETER (MM) | CIRCUMFERENCE (MM) |
|---|---|---|---|
| J | 4.75 | 15.49 | 48.7 |
| K | 5.25 | 15.90 | 50.0 |
| L | 5.5 | 16.50 | 51.8 |
| M | 6 | 16.90 | 53.1 |
| N | 6.5 | 17.30 | 54.4 |
| O | 7 | 17.70 | 55.7 |
| P | 7.5 | 18.10 | 56.9 |
Method 1: Using a ring you already own
- Find a ring that fits the intended finger comfortably.
- Measure the inside diameter of the ring in millimeters using a ruler or caliper.
- Compare the diameter to the chart above to find your size.
Method 2: Using a string or strip of paper
- Cut a thin strip of paper or use a piece of non-stretchy string.
- Wrap it snugly around the base of your finger.
- Mark where the ends meet with a pen.
- Measure the length of the strip or string in millimeters—this is your finger’s circumference.
- Compare to the chart above to find the closest size.