  |
Table of Watch Sizes
This table can be used to convert a watch size from one
system into another. Numbers that are in bold
are exact, as are the inches and millimeters columns. Remember, this is a measure of the diameter of the movement, not
the case.
|
Inches
|
Lancashire
|
Metric
(mm)
|
Ligne
|
Dennison
|
|
4.0000
|
85s
|
101.600
|
45
|
|
|
2.4000
|
37s
|
60.960
|
27
|
|
|
1.9333
|
23s
|
49.107
|
21¾
|
P
|
|
1.9000
|
22s
|
48.260
|
|
|
|
1.8750
|
20s
|
47.625
|
|
O
|
|
1.8667
|
20s
|
47.413
|
21
|
O
|
|
1.8429
|
19s
|
46.808
|
20¾
|
|
|
1.8333
|
19s
|
46.567
|
|
|
|
1.8206
|
|
46.244
|
20½
|
N
|
|
1.8125
|
|
46.037
|
20½
|
N
|
|
1.8000
|
18s
|
45.720
|
20¼
|
N
|
|
1.7762
|
17s
|
45.117
|
20
|
|
|
1.7667
|
17s
|
44.873
|
|
|
|
1.7540
|
|
44.553
|
19¾
|
M
|
|
1.7500
|
|
44.450
|
19¾
|
M
|
|
1.7318
|
16s
|
43.989
|
19½
|
|
|
1.7096
|
16s
|
43.425
|
19¼
|
|
|
1.7000
|
16s
|
43.180
|
|
L
|
|
1.6875
|
|
42.862
|
19
|
L
|
|
1.6667
|
15s
|
42.333
|
18¾
|
|
|
1.6430
|
14s
|
41.733
|
18½
|
|
|
1.6333
|
14s
|
41.487
|
|
K
|
|
1.6250
|
14s
|
41.275
|
18¼
|
K
|
|
1.6208
|
|
41.169
|
18¼
|
K
|
|
1.6000
|
13s
|
40.640
|
18
|
|
|
1.5764
|
12s
|
40.041
|
17¾
|
|
|
1.5667
|
12s
|
39.793
|
|
J
|
|
1.5625
|
12s
|
39.688
|
17½
|
J
|
|
1.5542
|
|
39.477
|
17½
|
J
|
|
1.5333
|
11s
|
38.947
|
17¼
|
|
|
1.5098
|
10s
|
38.349
|
17
|
I
|
|
1.5000
|
10s
|
38.100
|
|
I
|
|
1.4876
|
|
37.785
|
16¾
|
I
|
|
1.4667
|
9s
|
37.253
|
16½
|
|
|
1.4432
|
8s
|
36.657
|
16¼
|
H
|
|
1.4375
|
8s
|
36.512
|
16¼
|
H
|
|
1.4333
|
8s
|
36.407
|
|
H
|
|
1.4210
|
|
36.093
|
16
|
|
|
1.4000
|
7s
|
35.560
|
15¾
|
|
|
1.3766
|
6s
|
34.965
|
15½
|
G
|
|
1.3667
|
6s
|
34.713
|
|
G
|
|
1.3544
|
|
34.401
|
15¼
|
|
|
1.3333
|
5s
|
33.867
|
15
|
|
|
1.3125
|
|
33.337
|
14¾
|
F
|
|
1.3000
|
4s
|
33.020
|
|
F
|
|
1.2878
|
|
32.710
|
14½
|
|
|
1.2667
|
3s
|
32.173
|
14¼
|
|
|
1.2500
|
|
31.750
|
14
|
E
|
|
1.2434
|
|
31.582
|
14
|
E
|
|
1.2333
|
2s
|
31.327
|
|
|
|
1.2212
|
|
31.018
|
13¾
|
|
|
1.2000
|
1s
|
30.480
|
13½
|
D
|
|
1.1875
|
|
30.162
|
|
D
|
|
1.1768
|
|
29.890
|
13¼
|
D
|
|
|
Inches
|
Lancashire
|
Metric
(mm)
|
Ligne
|
Dennison
|
|
1.1667
|
0s
|
29.633
|
|
|
|
1.1546
|
|
29.326
|
13
|
|
|
1.1333
|
2/0s
|
28.787
|
12¾
|
C
|
|
1.1250
|
2/0s
|
28.575
|
12¾
|
C
|
|
1.1102
|
|
28.198
|
12½
|
|
|
1.1000
|
3/0s
|
27.940
|
|
|
|
1.0879
|
|
27.634
|
12¼
|
|
|
1.0667
|
4/0s
|
27.093
|
12
|
B
|
|
1.0625
|
4/0s
|
26.987
|
12
|
B
|
|
1.0435
|
|
26.506
|
11¾
|
|
|
1.0333
|
5/0s
|
26.247
|
|
|
|
1.0213
|
|
25.942
|
11½
|
|
|
1.0000
|
6/0s
|
25.400
|
11¼
|
A
|
|
0.9769
|
|
24.814
|
11
|
|
|
0.9667
|
7/0s
|
24.553
|
|
|
|
0.9547
|
|
24.250
|
10¾
|
|
|
0.9333
|
8/0s
|
23.707
|
10½
|
|
|
0.9103
|
|
23.122
|
10¼
|
|
|
0.9000
|
9/0s
|
22.860
|
|
|
|
0.8881
|
|
22.558
|
10
|
|
|
0.8667
|
10/0s
|
22.013
|
9¾
|
|
|
0.8437
|
|
21.430
|
9½
|
|
|
0.8333
|
11/0s
|
21.167
|
|
|
|
0.8215
|
|
20.866
|
9¼
|
|
|
0.8000
|
12/0s
|
20.320
|
9
|
|
|
0.7771
|
|
19.739
|
8¾
|
|
|
0.7667
|
13/0s
|
19.473
|
|
|
|
0.7549
|
|
19.175
|
8½
|
|
|
0.7333
|
14/0s
|
18.627
|
8¼
|
|
|
0.7105
|
|
18.047
|
8
|
|
|
0.7000
|
15/0s
|
17.780
|
|
|
|
0.6883
|
|
17.483
|
7¾
|
|
|
0.6667
|
16/0s
|
16.933
|
7½
|
|
|
0.6439
|
|
16.355
|
7¼
|
|
|
0.6333
|
17/0s
|
16.087
|
|
|
|
0.6217
|
|
15.791
|
7
|
|
|
0.6000
|
18/0s
|
15.240
|
6¾
|
|
|
0.5773
|
|
14.663
|
6½
|
|
|
0.5667
|
19/0s
|
14.393
|
|
|
|
0.5551
|
|
14.099
|
6¼
|
|
|
0.5333
|
20/0s
|
13.547
|
6
|
|
|
0.5107
|
|
12.971
|
5¾
|
|
|
0.5000
|
21/0s
|
12.700
|
|
|
|
0.4885
|
|
12.407
|
5½
|
|
|
0.4667
|
22/0s
|
11.853
|
5¼
|
|
|
0.4441
|
|
11.279
|
5
|
|
|
0.4333
|
23/0s
|
11.007
|
|
|
|
0.4219
|
|
10.715
|
4¾
|
|
|
0.4000
|
24/0s
|
10.160
|
4½
|
|
|
0.3775
|
|
9.587
|
4¼
|
|
|
0.3667
|
25/0s
|
9.313
|
|
|
|
0.3552
|
|
9.023
|
4
|
|
|
0.3333
|
26/0s
|
8.467
|
3¾
|
|
|
0.3108
|
|
7.895
|
3½
|
|
|
|
|