Ring Size Guide
Ring Size Guide
Find your
perfect size.
Three accurate methods to measure at home. No jeweller, no guesswork — and important guidance on which method works best on your device.
How your device affects sizing accuracy
💻 Desktop / Laptop
📱 iPhone
🤖 Android
Most accurate
The on-screen ring sizer works well on most laptops and desktop monitors. However, screen size and zoom level affect the result — always check your browser zoom is at 100% (Ctrl+0 on Windows, Cmd+0 on Mac) before measuring.
The on-screen ring sizer works well on most laptops and desktop monitors. However, screen size and zoom level affect the result — always check your browser zoom is at 100% (Ctrl+0 on Windows, Cmd+0 on Mac) before measuring.
Accurate with care
iPhones use a fixed, consistent screen density. The on-screen sizer can be used reliably, but you must ensure browser zoom is at default. For the truest result, use the string or paper method and enter your measurement below.
iPhones use a fixed, consistent screen density. The on-screen sizer can be used reliably, but you must ensure browser zoom is at default. For the truest result, use the string or paper method and enter your measurement below.
Varies by model
Android phones vary widely in screen size and pixel density between manufacturers. Do not rely on the on-screen ring sizer for Android — the ring may appear larger or smaller than real life. Use the string / paper method instead.
Android phones vary widely in screen size and pixel density between manufacturers. Do not rely on the on-screen ring sizer for Android — the ring may appear larger or smaller than real life. Use the string / paper method instead.
⚠️ The safest method on any device is always the string or paper method — it does not rely on screen calibration at all, so the result is accurate regardless of what device you use.
— mm
UK Size
—
US / CA
—
EU / ISO
—
⌀ mm
—
Getting an accurate reading
—Place an existing ring flat on the screen and slide the inner circle until it matches the inside of your ring exactly.
—Desktop / laptop users: check your browser zoom is 100% before measuring (Ctrl+0 / Cmd+0). Any other zoom level will make the ring appear a different size.
—iPhone users: this method works reliably at default zoom. Do not pinch-zoom the page.
—Android users: screen densities vary too much between devices for on-screen sizing to be reliable. Use the String / Paper method instead.
—If between two sizes, choose the larger — especially for wider bands.
—Measure mid-afternoon. Fingers swell slightly throughout the day and in warmth.
i
Cut a thin strip of paper about 10 cm long, or use a piece of non-stretch string.
ii
Wrap it snugly — not tightly — around the base of the finger you intend to wear the ring on.
iii
Mark where the ends overlap with a pen, then lay it flat against a ruler and measure the length.
iv
Enter your measurement below. We'll find your size instantly.
Circumference
UK Size
Enter measurement
US / CA
—
EU / ISO
—
⌀ mm
—
This method works on every device
—This is the most reliable method regardless of device. It does not depend on screen calibration, browser zoom, or display density.
—Use paper rather than string where possible — paper does not stretch, so the result is more consistent.
—Measure the specific finger you'll wear the ring on. Ring and index fingers are often different sizes even on the same hand.
—Measure at the end of the day. Fingers are at their largest in the afternoon and evening.
—If your result sits between two sizes, always choose the larger — especially for wider bands.
Use this table to convert between UK, US, EU, and metric sizing. If you used Method 1 or 2 above, your matched size will be highlighted here automatically.
| UK | US / Canada | EU / ISO | Diameter (mm) | Circumference (mm) |
|---|
A note on wide bands
—Standard sizing assumes a band width of 2–4 mm. For bands wider than 6 mm, size up by half — a wider band sits higher on the finger and feels tighter.
—Not sure? We offer one complimentary resize within 60 days of delivery on all Wave Jewellery rings.
—Buying as a surprise? The average UK women's size is L–M. Most people fall between J and O.