Measure ring size

Please open on your smartphone

This tool measures your ring size directly on the screen — a smartphone is required. Open this page on your phone or scan the QR code from our guide.

To the guide with QR code → Or: download printable PDF guide →
Measure ring size

Please rotate your phone

For a precise measurement, we need landscape mode.

This tool works for sizes 48 to 60.
Prefer to print? Printable PDF guide →
Fullscreen on iPhone

How to hide the browser bar

  1. Tap “aA" at the top of the address bar.
  2. Select “Hide toolbar".

The measurement remains exact even without fullscreen — the card calibration automatically compensates for the browser bar.

Step 1 of 3

Which phone are you using?

For an exact screen calibration
Tip: more space — tap “aA” in the address bar and choose “Hide Toolbar”.
Not with you? Choose “Other device" — the card calibration in the next step will compensate everything.
Prefer to print? Printable PDF guide →
Step 2 of 3

Calibrate screen

Device detected
↓ Place bank card here
85.6 mm Length of a bank card

Place the left edge of your bank card on the thick line on the left. Adjust with + / − until the right edge of the bar matches the card.

150%
Step 3 of 3

Choose ring size

Place your ring on the screen — its inner edge should exactly enclose one of the circles.
Your size: —