Ring sizer
Measure a ring you already own.
Two steps: teach the page how big your screen is, then lay a ring on the circle. Use a ring that fits the finger you are buying for.
Hold any bank card (or a UK photocard driving licence — they are the same size) flat against the screen, over the outline. Slide until the outline matches the card exactly. Cover the card number with your finger.
Zoom your browser to 100% first. If you do not have a card to hand, skip this step: the result will be less exact.
Lay your ring on the circle. Resize until the circle sits exactly on the inside edge of the ring — not the outside.
- Inner diameter
- 17.3 mm
- Inner circumference
- 54.4 mm
A guide, not a gauge: screens and rings vary, so treat the result as up to half a size out either way. Wide bands (6 mm and up) fit tighter — consider half a size up. Thumb rings are open and come in two fits; knuckle rings sit higher up the finger, so measure a ring that fits there.
Good to know
- Use any card of standard bank-card size (85.60 × 53.98 mm), such as a debit card or a UK photocard driving licence. Do not show the card number — place it face down or cover it. Nothing is photographed, stored or sent to us.
- Your screen calibration is remembered in this browser only, so you don’t have to repeat it next time. Clear your browser’s site data to remove it.
- Measure a ring that fits the finger you are buying for, at the end of the day when fingers are slightly larger.
- The result is a guide and can differ by up to half a size. If you are between two sizes, choose the larger one for wide bands and signets.
No ring to measure?
Wrap a thin strip of paper around the base of your finger, mark where it overlaps, and measure the length in millimetres. That is your inner circumference — which is also your EU size. Find it in the size table to get the UK letter.