Ring Size Guide
Find your ring size in seconds — measure at home in millimetres or inches and match it instantly against AU/UK, US and EU sizing, or browse the full conversion chart below.
Size calculator
mm
Wrap a strip of paper or string snugly around the base of your finger, mark where it overlaps, then measure that length against a ruler — in millimetres or inches, whichever your ruler shows.
Your closest size
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How to measure
String or paper strip
- Cut a thin strip of paper or a piece of string.
- Wrap it snugly around the base of the finger you'll wear the ring on.
- Mark where the end overlaps, then lay it flat against a ruler.
- Enter that number above in circumference mode, with the toggle set to match your ruler.
An existing ring
- Pick a ring that already fits the intended finger well.
- Lay it flat and measure straight across the inside edge to edge.
- That's the inner diameter.
- Enter that number above in diameter mode, with the toggle set to match your ruler.
Full conversion chart
| AU / UK | US | EU | Diameter | Circumference |
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Sizing tips
- Measure at the end of the day, when fingers are at their largest — avoid measuring when cold.
- Millimetres give the most accurate result: ring sizes are only about 0.2mm apart in diameter, which is finer than most inch rulers can read.
- Wider bands (6mm+) fit more snugly — consider sizing up half a size.
- If you're between two sizes, we recommend sizing up.
- Dominant hands are often slightly larger — measure the finger you'll actually wear the ring on.