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Measure ring size

Please open on a 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 in 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? 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 select “Hide Toolbar”.
Not available? Choose “Other device” — the card calibration in the next step will compensate for everything.
Prefer to print? Printable PDF instructions →
Step 2 of 3

Calibrate screen

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

Align the left edge of your bank card with the thick line on the left. Use + / − to adjust 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 precisely enclose a circle.
Your size: —