On-screen ring sizer

This tool measures a ring you already own, on your screen, in under a minute: first calibrate the screen against any bank card, then lay the ring on the circle and match its inner edge. The result is an EU size — the finger circumference in millimetres.

1 Calibrate with a bank card

Place any bank card against the screen and drag the slider until the outline is exactly the same width as the card. Every card on earth is 85.6 mm wide.

When the screen is not enough

A screen measurement is accurate to about half a size. If the result sits between sizes, if the ring is not round any more, or if there is no ring to borrow at all — ten minutes at the atelier settles it exactly, with proper sizing rings on the finger itself.

Ring size chart (EU sizes)

The EU ring size is the finger circumference in millimetres. The most common women's sizes in Estonia are 52–55; men's are 60–66.

EU size (circumference, mm) Inner diameter (mm) US size (approx.)
48 15.3 4.5
49 15.6 5.0
50 15.9 5.5
51 16.2 5.5
52 16.6 6.0
53 16.9 6.5
54 17.2 7.0
55 17.5 7.5
56 17.8 7.5
57 18.1 8.0
58 18.5 8.5
59 18.8 9.0
60 19.1 9.0
61 19.4 9.5
62 19.7 10.0
63 20.1 10.5
64 20.4 11.0
65 20.7 11.0
66 21.0 11.5
67 21.3 12.0
68 21.6 12.5
69 22.0 12.5
70 22.3 13.0