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Insidediameter
Insidecircumference
Insidediameter
Insidecircumference
facetjewelry.comFCT-
RSO
N05
16_0
4
©2009 Kalmbach Publishing Co. This material may not be reproduced in any form without permission from the publisher.
Ring size chart
Calculating ring blank lengthTo determine the length of a metal blank needed to make a ring, you need to know the inside diameter of the desired ring size, the gauge (thickness of the metal), and the width of the metal.
For bands up to 4 mm wide, and between 24 gauge (0.5 mm) and 12 gauge (2.1 mm), you can use the following formula to calculate the ring blank length:
Ring blank length (mm) = inside diameter (mm) + metal thickness (mm) x 3.14
For bands wider than 4 mm, add 0.5 mm to the length of the blank.
US SIZE UK SIZEINSIDE DIAMETER (MM)
INSIDE CIRCUMFERENCE (MM)
5 J 15.6 49
5 ½ K 16 50.3
6 L 16.4 51.5
6 ½ M 16.8 52.8
7 N 17.2 54
7 ½ O 17.6 55.3
8 P 18 56.6
8 ½ Q 18.4 57.8
9 R 18.8 59.1
9 ½ S 19.2 60.3
10 T 19.6 61.6
10 ½ U 20 62.8
11 V 20.4 64.1
11 ½ W 20.8 65.3
12 X 21.2 66.6
12 ½ Y 21.6 67.9
13 Z 22 69.1
Ring mandrels