Multi-Sizer Adjustable Finger Gauge

Item Number: 116213

Keep this inexpensive finger gauge on hand for anyone who can’t come into your store to be measured. Your customer simply adjusts the sizer to fit and returns it to you.

Catalog page: 2013 Tools and Equipment Catalog p.203

How To

How To Size Rings Accurately

To ensure an accurate ring size (or an accurate size on any circular jewelry piece), add the wire diameter (or the bar-stock thickness) to the finished inside diameter you want and multiply by pi (3.14).

1 Start with the desired inside diameter of the finished ring.

2 Add the wire diameter or metal thickness.

3 Multiply the result by pi (3.14).

4 This is the length of material you will need to cut to achieve your desired final result.

Charts

Ring Size Comparison Chart Please Note: All equivalents are approximate.
U.S. & Canadian Standard	Inside Diameter mm/inches	Inside Circumference mm / inches	British	French	German	Swiss
1-1/2	12.78 / .503	40.2 / 1.580	C	40-1/2	12-3/4	—
2	13.21 / .520	41.5 / 1.634	D	41-1/2	13-1/4	2
2-1/2	13.61 / .536	42.7 / 1.684	E	42-3/4	13-3/4	3
3	14.05 / .553	44.0 / 1.739	F	44	14	4
3-1/2	14.45 / .569	45.2 / 1.788	G	45-1/4	14-1/2	—
4	14.86 / .585	46.5 / 1.836	H-1/2	46-1/2	15	7
4-1/2	15.27 / .601	47.8 / 1.888	I-1/2	47-3/4	15-1/4	8
5	15.70 / .618	49.0 / 1.941	J-1/2	49	15-3/4	9
5-1/2	16.10 / .634	50.2 / 1.992	L	50-1/4	16	—
6	16.51 / .650	51.5 / 2.042	M	51-1/2	16-1/2	12
6-1/2	16.92 / .666	52.8 / 2.092	N	52-3/4	17	13
7	17.35 / .683	54.0 / 2.146	N-1/2	54	17-1/4	14
7-1/2	17.63 / .699	55.3 / 2.196	O-1/2	55-1/2	17-1/2	15
8	18.19 / .716	56.6 / 2.249	P-1/2	56-3/4	18	16
8-1/2	18.59 / .732	57.8 / 2.300	Q-1/2	58	18-1/2	17
9	18.99 / .748	59.1 / 2.350	R-1/2	59-1/4	19	18
9-1/2	19.41 / .764	60.3 / 2.400	S-1/2	60-1/2	19-1/2	19
10	19.84 / .781	61.6 / 2.463	T-1/2	61-3/4	20	20
10-1/2	20.24 / .797	62.8 / 2.504	U-1/2	62-3/4	20-1/4	22
11	20.68 / .814	64.1 / 2.567	V-1/2	64-1/2	20-3/4	23
11-1/2	21.01 / .830	66.0 / 2.608	W-1/2	66	21	24
12	21.41 / .846	67.3 / 2.658	Y	67-1/4	21-1/2	25