Finding the correct ring size is essential for comfort, appearance, and long-term wear. Since ring sizing systems vary between countries, shopping internationally or online can quickly become confusing. A US size doesn’t directly match a UK or European size, making a reliable conversion chart especially useful.
This guide includes international ring size charts, explains how to measure your finger accurately, and shares practical tips to help you choose the right fit.
Ring Conversion Size Chart
Ring Size Chart US
| Diameter (mm) | Circumference (mm) | US & Canada Ring Size |
| 14.1 | 44.2 | 3 |
| 14.4 | 45.5 | 3.5 |
| 14.9 | 46.8 | 4 |
| 15.3 | 48.1 | 4.5 |
| 15.7 | 49.3 | 5 |
| 16.1 | 50.6 | 5.5 |
| 16.5 | 51.8 | 6 |
| 16.9 | 53.1 | 6.5 |
| 17.3 | 54.3 | 7 |
| 17.7 | 55.6 | 7.5 |
| 18.1 | 56.9 | 8 |
| 18.5 | 58.1 | 8.5 |
| 18.9 | 59.4 | 9 |
| 19.4 | 60.9 | 9.5 |
| 19.8 | 62.2 | 10 |
| 20.2 | 63.5 | 10.5 |
| 20.6 | 64.7 | 11 |
| 21 | 66.0 | 11.5 |
| 21.4 | 67.2 | 12 |
| 21.8 | 68.5 | 12.5 |
| 22.2 | 69.7 | 13 |
| 22.6 | 69.13 | 13.5 |
| 23 | 70.15 | 14 |
| 23.4 | 73.51 | 14.5 |
| 23.8 | 74.77 | 15 |
| 24.2 | 76.03 | 15.5 |
| 24.6 | 77.28 | 16 |
Ring Size Chart UK
| Diameter (mm) | Circumference (mm) | UK Ring Size |
| 13.7 | 43.1 | A |
| 14.0 | 44.0 | B |
| 14.3 | 44.9 | C |
| 14.6 | 45.8 | D |
| 14.9 | 46.7 | E |
| 15.2 | 47.7 | F |
| 15.5 | 48.6 | G |
| 15.9 | 49.5 | H |
| 16.2 | 50.4 | I |
| 16.5 | 51.4 | J |
| 16.8 | 52.3 | K |
| 17.2 | 53.2 | L |
| 17.5 | 54.1 | M |
| 17.8 | 55.1 | N |
| 18.1 | 56.0 | O |
| 18.5 | 56.9 | P |
| 18.8 | 57.8 | Q |
| 19.1 | 58.7 | R |
| 19.4 | 59.7 | S |
| 19.7 | 60.6 | T |
| 20.1 | 61.5 | U |
| 20.4 | 62.5 | V |
| 20.7 | 63.4 | W |
| 21.0 | 64.3 | X |
| 21.3 | 65.2 | Y |
| 21.7 | 66.2 | Z |
| 22.0 | 67.1 | Z+1 |
| 22.3 | 68.0 | Z+2 |
| 22.6 | 69.0 | Z+3 |
| 23.0 | 69.9 | Z+4 |
| 23.3 | 70.8 | Z+5 |
| 23.6 | 71.7 | Z+6 |
| 23.9 | 72.7 | Z+7 |
| 24.2 | 73.6 | Z+8 |
| 24.6 | 74.5 | Z+9 |
| 24.9 | 75.4 | Z+10 |
Ring Size Chart ( In Inch)
| Inside Circumference: IN | Inside Circumference: MM | US, Canada, Mexico | UK, Australia, Ireland, New Zealand, South Africa |
| 1.74 | 44.2 | 3 | F |
| 1.77 | 44.8 | 3.25 | F 1/2 |
| 1.79 | 45.5 | 3.5 | G |
| 1.82 | 46.1 | 3.75 | G 1/2 |
| 1.84 | 46.8 | 4 | H |
| 1.87 | 47.4 | 4.25 | H 1/2 |
| 1.89 | 48 | 4.5 | I |
| 1.92 | 48.7 | 4.75 | J |
| 1.94 | 49.3 | 5 | J 1/2 |
| 1.97 | 50 | 5.25 | K |
| 1.99 | 50.6 | 5.5 | K 1/2 |
| 2.02 | 51.2 | 5.75 | L |
| 2.04 | 51.9 | 6 | L 1/2 |
| 2.07 | 52.5 | 6.25 | M |
| 2.09 | 53.1 | 6.5 | M 1/2 |
| 2.12 | 53.8 | 6.75 | N |
| 2.14 | 54.4 | 7 | N 1/2 |
| 2.17 | 55.1 | 7.25 | O |
| 2.19 | 55.7 | 7.5 | O 1/2 |
| 2.22 | 56.3 | 7.75 | P |
| 2.24 | 57 | 8 | P 1/2 |
| 2.27 | 57.6 | 8.25 | Q |
| 2.29 | 58.3 | 8.5 | Q 1/2 |
| 2.32 | 58.9 | 8.75 | R |
| 2.34 | 59.5 | 9 | R 1/2 |
| 2.37 | 60.2 | 9.25 | S |
| 2.39 | 60.8 | 9.5 | S 1/2 |
| 2.42 | 61.4 | 9.75 | T |
| 2.44 | 62.1 | 10 | T 1/2 |
| 2.47 | 62.7 | 10.25 | U |
| 2.49 | 63.4 | 10.5 | U 1/2 |
| 2.52 | 64 | 10.75 | V |
| 2.54 | 64.6 | 11 | V 1/2 |
| 2.57 | 65.3 | 11.25 | W |
| 2.59 | 65.9 | 11.5 | W 1/2 |
| 2.62 | 66.6 | 11.75 | X |
| 2.65 | 67.2 | 12 | X 1/2 |
| 2.68 | 68.1 | 12.25 | Y |
| 2.71 | 68.5 | 12.5 | Z |
| 2.72 | 69.1 | 12.75 | Z 1/2 |
| 2.75 | 69.7 | 13 | — |
Understanding International Ring Size Systems
Different countries use different methods for determining ring sizes.
- United States and Canada use numeric sizes.
- United Kingdom, Australia, and New Zealand use alphabetical sizes.
- Europe typically uses the ring’s inside circumference in millimeters.
- Japan follows its own numbered sizing system.
Because of these differences, it’s important to use a conversion chart whenever purchasing rings from international retailers.
How to Measure Your Ring Size at Home
Measuring your finger correctly helps reduce the chances of ordering the wrong size.
Method 1: Measure Your Finger
Wrap a strip of paper or a flexible measuring tape around the base of your finger. Mark where the ends meet and measure the length in millimeters. Compare this measurement with the conversion chart above.
Method 2: Measure an Existing Ring
If you already own a ring that fits well, measure its inside diameter with a ruler or caliper. Match the diameter to the appropriate ring size using the chart.
For the most accurate results, use a ring sizer or visit a local jeweler.
Tips for Choosing the Right Ring Size
Several factors can affect how a ring fits throughout the day.
- Measure your finger in the evening when it is at its normal size.
- Avoid measuring immediately after exercising or when your hands are very cold.
- Wider bands generally feel tighter and may require going up half a size.
- If you’re between sizes, choose the larger size for greater comfort.
Considering these factors helps ensure a ring fits comfortably without slipping off.
Common Ring Size Conversion Tips
International conversion charts provide reliable estimates, but small differences can exist between jewelry manufacturers.
Before ordering:
- Check the retailer’s sizing guide.
- Confirm whether sizes are based on inside diameter or circumference.
- Read customer reviews for sizing accuracy.
- When buying expensive jewelry, consider having your finger professionally measured.
These extra steps can help avoid unnecessary exchanges or resizing.
Common Mistakes When Measuring Ring Size
Even small measurement errors can affect the fit of your ring.
Common mistakes include:
- Measuring swollen fingers after exercise.
- Measuring when hands are unusually cold.
- Pulling the measuring tape too tightly.
- Ignoring the width of the ring band.
- Relying on estimates instead of actual measurements.
Taking multiple measurements throughout the day often produces more reliable results.
Conclusion
Using an international ring conversion size chart makes buying rings from local and international retailers much easier. Accurate measurements, combined with an understanding of different sizing systems, help you choose a comfortable fit and reduce the need for resizing. Before making a purchase, compare your measurements with the retailer’s size guide for the best possible accuracy.
FAQs
How do I measure my ring size at home?
You can wrap a strip of paper or flexible measuring tape around the base of your finger, measure the circumference in millimeters, and compare it with a ring size conversion chart. Measuring an existing ring’s inside diameter also works well.
Why are ring sizes different in different countries?
Countries use different sizing systems. For example, the US uses numerical sizes, while the UK uses letters and Europe commonly uses millimeter measurements. A conversion chart makes it easy to compare these systems.
Should I size up or down if I’m between sizes?
If you’re between sizes, sizing up is usually the safer choice, especially for wider bands or if your fingers tend to swell during the day.
Does ring width affect sizing?
Yes. Wider rings generally fit more snugly than thin bands. Many jewelers recommend increasing your size by about half a size for wide bands.
Can all rings be resized?
Most gold, silver, and platinum rings can be resized. However, eternity bands, titanium, tungsten, ceramic, and some gemstone settings may be difficult or impossible to resize.