Cutting Ring Stock To the Correct Size

Use this chart to understand how to cut the right amount of stock for a ring.

Last edited: 9/26/2019
Measuring A Ring Blank
To get a proper ring fit, you must compensate for the thickness of the ring band when measuring the blank. Forcing the outside ends of the blank together for soldering compresses the inside circumference, making the ring smaller. To correct for this, multiple 3.14 by the thickness of the blank. Then, take that number and add to the length (inside circumference) before cutting it. If the ring band is wider than 4mm, add an extra 0.5mm.
United States &
Canadian Standard		 Inside
Diameter inches
(mm)		 Inside Circumference inches (mm)
4 .585 (14.86) 1.836 (46.5)
5 .618 (15.70) 1.941 (49.0)
6 .650 (16.51) 2.042 (51.5)
7 .683 (17.35) 2.146 (54.0)
8 .716 (18.19) 2.249 (56.6)
9 .748 (18.99) 2.350 (59.1)
10 .781 (19.84) 2.463 (61.6)
11 .814 (20.68) 2.567 (64.1)
12 .846 (21.41) 2.658 (67.3)