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How to Determine the Size of Your Watch

Watch movements are measured in an arcane English system of measurement called the Lancashire system or Lancashire Gauge**. In this system, 1 5/30th inches is the "base" measurement and is called 0-size. Each 1/30th of an inch adds 1 (or subtracts 1) to this base. A watch is measured through the center of the lower plate of the movement (the dial side). If the movement is asymmetrical, say oval or rectangular, it is measured at its narrowest point. Note that the case is NOT included in this measurement, only the movement.?Measuring the dial is usually a fair approximation of the lower plate measurement.

Watch Size Fractional Inch Decimal Inch Lignes Millimeters
18 1 23/30 1.766 19.87 44.86
17 1 22/30 1.733 19.50 44.02
16 1 21/30 1.700 19.12 43.17
15 1 20/30 1.666 18.75 42.33
14 1 19/30 1.633 18.37 41.48
13 1 18/30 1.600 18.00 40.63
12 1 17/30 1.566 17.62 39.79
11 1 16/30 1.533 17.25 38.94
10 1 15/30 1.500 16.87 38.09
9 1 14/30 1.466 16.50 37.25
8 1 13/30 1.433 16.12 36.40
7 1 12/30 1.400 15.75 35.55
6 1 11/30 1.366 15.37 34.71
5 1 10/30 1.333 15.00 33.86
4 1 9/30 1.300 14.62 33.01
3 1 8/30 1.266 14.25 32.17
2 1 7/30 1.233 13.87 31.32
1 1 6/30 1.200 13.50 30.47
0 1 5/30 1.166 13.12 29.63
2/0 1 4/30 1.133 12.75 28.78
3/0 1 3/30 1.100 12.37 27.93
4/0 1 2/30 1.066 12.00 27.09
5/0 1 1/30 1.033 11.62 26.24
6/0 1 0/30 1.000 11.25 25.39
7/0 29/30 .966 10.87 24.55
8/0 28/30 .933 10.50 23.70
9/0 27/30 .900 10.12 22.85
10/0 26/30 .866 9.75 22.01
11/0 25/30 .833 9.37 21.16
12/0 24/30 .800 9.00 20.31
13/0 23/30 .766 8.62 19.47
14/0 22/30 .733 8.25 18.62
15/0 21/30 .700 7.87 17.77
16/0 20/30 .666 7.50 16.93
17/0 19/30 .633 7.12 16.08
18/0 18/30 .600 6.75 15.23
19/0 17/30 .566 6.37 14.39
20/0 16/30 .533 6.00 13.54
21/0 15/30 .500 5.62 12.69
22/0 14/30 .466 5.25 11.85
23/0 13/30 .433 4.87 11.00
24/0 12/30 .400 4.50 10.15
25/0 11/30 .366 4.12 9.31
26/0 10/30 .333 3.75 8.46
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