Measure Your Ring Size Using a Ring You Already Own

Existing Ring Mode is mobile-only because a phone can lie flat on a table, which makes it easier to place the ring level and align the inside edge accurately.

Open this same page on your phone

Scan the QR code or copy the link. On a phone, calibrate this page and use the ring measurement tool.

Need another method?

Use the converter if you already know a size, or switch to the finger strip when you do not have a ring that fits.

Use converter Use strip method

How Existing Ring Mode works

Use a ring that already fits the same finger, then match its inside edge to the on-screen circle. The resulting diameter is converted to approximate India, US, UK and EU sizes.

Inner diameter, not outer diameter

Measure straight across the empty opening inside the ring. Including the metal band makes the diameter larger than the space your finger uses.

Why screen calibration matters

A saved card match makes the on-screen circle correspond to a physical diameter on this phone. If the app detects a browser or display-scale change, it asks you to recalibrate before continuing.

Alignment and repeatability checks

Use a ring that fits the same finger and hand. Keep your phone flat, view from directly above, and align the inside edge rather than the outer rim. Recheck if the ring is tilted, its edges do not meet the guide evenly, or you used a ring that feels loose or tight.

Do not have a ring?

Try a paper strip, convert a measurement you already have, or review the accuracy guidance.

Use a paper strip Open converter Accuracy guidance Ring sizing FAQ Existing ring guide

A chart row, shown from the same data the tool uses

This example is read directly from the shared chart. Your result can select a different row depending on the inner diameter you align.

Diameter: 17.2 mm
Circumference: 54.0 mm
India: 14
US: 7
UK: N
EU: 54