Ring Size Conversion Chart: US, UK & International Sizes
Finding the perfect ring size can be tricky, especially when shopping from international brands. Different countries use different ring sizing systems, and converting between them is essential to ensure a perfect fit.
This guide provides an easy-to-use ring size conversion chart for US, UK, European (EU), Japanese, and other international ring sizes. Whether you’re buying a gift for someone special or treating yourself to a luxurious ring, this guide will help you find the right size with confidence.
Table of Contents
Understanding Ring Size Measurements
Ring sizes are measured in two primary ways:
✔ Inside Diameter (mm): The width of the ring from one inner edge to the other.
✔ Circumference (mm): The total length around the inside of the ring.
Different countries use different numbering systems:
- US & Canada: Numeric sizes (e.g., 5, 6, 7)
- UK & Australia: Alphabetical sizes (e.g., J, K, L)
- Europe (EU): Numeric sizes based on circumference (e.g., 48, 50, 52)
- Japan: Numeric sizes different from US/EU (e.g., 7, 9, 11)
Ring Size Conversion Chart: US, UK, EU & More
Use the conversion table below to find the equivalent size in US, UK, EU, Japan, and other common sizing systems.
| US Size | UK Size | EU Size | Japan Size | Inside Diameter (mm) | Circumference (mm) |
|---|---|---|---|---|---|
| 3 | F | 44 | 4 | 14.1 mm | 44.2 mm |
| 3.5 | G | 45 | 5 | 14.5 mm | 45.5 mm |
| 4 | H | 46 | 7 | 14.9 mm | 46.8 mm |
| 4.5 | I | 47 | 8 | 15.3 mm | 48.0 mm |
| 5 | J | 49 | 9 | 15.7 mm | 49.3 mm |
| 5.5 | K | 50 | 10 | 16.1 mm | 50.6 mm |
| 6 | L | 51 | 11 | 16.5 mm | 51.9 mm |
| 6.5 | M | 52 | 13 | 16.9 mm | 53.1 mm |
| 7 | N | 54 | 14 | 17.3 mm | 54.4 mm |
| 7.5 | O | 55 | 15 | 17.7 mm | 55.7 mm |
| 8 | P | 57 | 16 | 18.1 mm | 57.0 mm |
| 8.5 | Q | 58 | 17 | 18.5 mm | 58.3 mm |
| 9 | R | 59 | 18 | 19.0 mm | 59.5 mm |
| 9.5 | S | 60 | 19 | 19.4 mm | 60.8 mm |
| 10 | T | 62 | 20 | 19.8 mm | 62.1 mm |
| 10.5 | U | 63 | 22 | 20.2 mm | 63.4 mm |
| 11 | V | 65 | 23 | 20.6 mm | 64.6 mm |
| 11.5 | W | 66 | 24 | 21.0 mm | 65.9 mm |
| 12 | X | 68 | 25 | 21.4 mm | 67.2 mm |
| 12.5 | Y | 69 | 26 | 21.8 mm | 68.5 mm |
| 13 | Z | 71 | 27 | 22.2 mm | 69.7 mm |
How to Measure Your Ring Size at Home
If you don’t know your ring size, you can measure it at home using simple methods.
1. Measure with a String or Paper Strip
✔ What You Need: A piece of string, a ruler, and a pen.
Steps:
- Mark the point where it overlaps.
- Lay it flat and measure in millimeters (mm).
✔ Tip: Measure at the end of the day when your fingers are slightly swollen.
2. Use an Existing Ring
✔ What You Need: A ring that fits well and a ruler.
Steps:
- Place the ring on a flat surface.
- Measure the inside diameter (mm) from one inner edge to the other.
- Compare the measurement to the diameter column in the chart above.
✔ Tip: If in doubt, choose a slightly larger size for comfort.
Key Tips for Finding the Right Ring Size
✔ Measure Multiple Times – Your finger size may fluctuate throughout the day.
✔ Consider Your Knuckles – If they are large, pick a size that fits over them comfortably.
✔ Know Your Dominant Hand – The dominant hand’s fingers are usually slightly bigger.
✔ Use a Professional Ring Sizer – If you want precise measurements, visit a jeweler.
What If Your Ring Size Falls Between Two Sizes?
✔ For a snug fit, choose the smaller size.
✔ For a looser fit, go with the larger size.
✔ For stacking rings, consider going half a size up.
Can a Ring Be Resized?
Most rings made of gold, silver, or platinum can be resized by a jeweler. However, rings made from tungsten, titanium, and some ceramic materials cannot be resized. If unsure, check the store’s resizing or exchange policy before purchasing.
Final Thoughts: Find Your Perfect Ring Size with Confidence
Choosing the right ring size is essential for comfort and security. Whether you’re shopping locally or internationally, use this conversion chart and measurement tips to find the perfect fit.
Now that you know your ring size, you can confidently shop for stunning rings that match your style!