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Measure ring size

Measure ring size

Please open on your smartphone

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

Go to the instructions with QR code → Or: download printable PDF instructions →
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 it? Printable PDF instructions →
Full screen on iPhone

How to hide the browser bar

  1. Tap “aA” or the menu icon in the address bar.
  2. Select “Hide toolbar”.

The measurement remains accurate even without full screen — the card calibration automatically compensates for the browser bar.

Step 1 of 3

Which phone are you using?

For precise 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 for everything.
Prefer to print it? Printable PDF instructions →
Step 2 of 3

Calibrate screen

Device detected
↓ Place bank card here
85.6 mm Bank card length

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

150%
Step 3 of 3

Choose ring size

Place your ring on the screen — the inner edge of the ring should fit exactly around the circle line.
Your size: —