Find Your Perfect
Ring Size
Ditch the guesswork. Whether you're buying an engagement ring online or converting a European size to US, our interactive ring size calculator and international conversion chart ensures a perfect fit every time.
Equivalent Sizes
US Size
6
AU/UK Size
L
Circumference
51.9mm
Diameter
16.31mm
What Are Ring Sizes and Measurements?
A ring size is a way to measure the inside of a ring so it fits snugly (but not too tight) around your finger. In many regions like the UK and Australia, alphabet letters are used to mark sizes (e.g., A through Z). In the US and Canada, numbered sizes are the standard. Finding your exact size involves measuring either the inner diameter or the circumference of your finger in millimetres (mm).
How to Measure Your Ring Size at Home
Measuring your ring size at home is simple once you know the right methods. Whether you're planning a surprise proposal or picking the perfect fit for yourself, here are the most accurate and beginner-friendly ways to find your size without professional tools.
Method 1: The Paper or String Method
This is the most popular DIY method because it uses items you already have at home.
- Get your tools: Cut a thin strip of paper (about 6mm wide) or a piece of non-stretch string.
- Wrap it: Wrap it around the base of your intended finger. Ensure it's snug but not uncomfortably tight—it must be able to slide over your knuckle.
- Mark it: Use a fine-tipped pen to mark exactly where the paper or string overlaps.
- Measure it: Lay it flat against a ruler and measure the length in millimetres to find your exact circumference.
- Convert it: Enter your measurement in our converter above or reference the chart below.
Method 2: Using a Ring You Already Own
If you already have a ring that fits the correct finger perfectly, you can measure its internal diameter.
- Place it flat: Put the ring on a flat surface or a piece of paper.
- Measure the diameter: Use a ruler to measure straight across the inside edge of the ring in millimetres.
- Match the size: Compare the diameter measurement with our conversion chart below.
Expert Sizing Tips
- Time of Day: Fingers shrink in the cold and swell in the heat. Measure at the end of the day when your fingers are at their largest natural size.
- Wider Bands: If you are buying a thick band (over 4mm wide), we highly recommend sizing up by a half size for comfort.
- Measure Twice: Always repeat the measurement 2–3 times to confirm consistency, especially for custom pieces.
International Ring Size Conversion Chart
Use this definitive ring size chart to manually map your finger circumference or ring diameter to the standard US and AU/UK formats.
| AU/UK Size | US Size | Finger Circumference (mm) | Ring Inside Diameter (mm) |
|---|---|---|---|
| A | 0.5 | 37.8 | 12.04 |
| B | 1 | 39.1 | 12.45 |
| C | 1.5 | 40.4 | 12.85 |
| D | 2 | 41.7 | 13.26 |
| E | 2.5 | 42.9 | 13.67 |
| F | 3 | 44.2 | 14.07 |
| G | 3.5 | 45.5 | 14.48 |
| H | 4 | 46.8 | 14.88 |
| I | 4.5 | 48 | 15.29 |
| J | 5 | 49.3 | 15.49 |
| K | 5.5 | 50.6 | 15.9 |
| L | 6 | 51.9 | 16.31 |
| M | 6.5 | 53.1 | 16.71 |
| N | 7 | 54.4 | 17.12 |
| O | 7.5 | 55.7 | 17.53 |
| P | 8 | 57.0 | 17.93 |
| Q | 8.5 | 58.3 | 18.34 |
| R | 9 | 59.5 | 18.75 |
| S | 9.5 | 60.8 | 19.15 |
| T | 10 | 62.1 | 19.56 |
| U | 10.5 | 63.4 | 19.96 |
| V | 11 | 64.6 | 20.37 |
| W | 11.5 | 65.9 | 20.78 |
| X | 12 | 67.2 | 21.18 |
| Y | 12.5 | 68.5 | 21.59 |
| Z | 13 | 69.7 | 22.79 |
Frequently Asked Questions
What if I fall between two sizes?
Always size up. A ring that is slightly too large is much easier (and cheaper) to resize down than a ring that is too small.
Are men's and women's scales different?
No, the ring sizing scale is universal regardless of gender. However, the average women's ring size in the US is 6 to 6.5, while the average men's size is 9 to 10.
What if my knuckles are larger than my finger?
Size for the knuckle. The ring must comfortably slide over your joint first. If the base of your finger is significantly smaller, consider asking a jeweler to add sizing beads inside the band to prevent spinning.
Can all rings be resized?
No. Rings with full eternity bands (stones wrapping all the way around), highly complex engravings, or those made of alternative metals like tungsten or titanium typically cannot be resized.
String vs. Paper: Which is better?
Paper is generally more reliable. String can stretch or twist unintentionally, leading to a false measurement. A thin strip of paper is more rigid and acts closer to a solid metal band.