Imperial-Metric conversion chart
Courtesy of Tbone.
Fraction
Decimal
Millimetre
1
1
25.4
63/64
0.984
25.0031
31/32
0.9688
24.6062
61/64
0.9531
24.2094
15/16
0.9375
23.8125
59/64
0.9219
23.4156
29/32
0.9062
23.0187
57/64
0.8906
22.6219
7/8
0.875
22.225
55/64
0.8594
21.8281
27/32
0.8438
21.4312
53/64
0.8281
21.0344
13/16
0.8125
20.6375
51/64
0.7969
20.2406
25/32
0.7812
19.8438
49/64
0.7656
19.4469
3/4
0.75
19.05
47/64
0.7344
18.6531
23/32
0.7188
18.2563
45/64
0.7031
17.8594
11/16
0.6875
17.4625
43/64
0.6719
17.0656
21/32
0.6562
16.6687
41/64
0.6406
16.2719
5/8
0.62
15.875
39/64
0.6094
15.4781
19/32
0.5938
15.0813
37/64
0.5781
14.6844
11/16
0.5625
14.2875
35/64
0.5469
13.8906
17/32
0.5312
13.4937
33/64
0.5156
13.0969
1/2
0.5
12.7
31/64
0.4844
12.3031
15/32
0.4688
11.9062
29/64
0.4531
11.5094
7/16
0.4375
11.1125
27/64
0.422
10.7188
13/32
0.4062
10.3187
25/64
0.3906
9.9219
3/8
0.375
9.525
23/64
0.3594
9.1281
11/32
0.3438
8.7312
21/64
0.3281
8.3344
5/16
0.3125
7.9375
19/64
0.2969
7.5406
9/32
0.2812
7.1437
17/64
0.2656
6.7469
1/4
0.25
6.35
15/64
0.2344
5.9531
7/32
0.2188
5.5563
13/64
0.2031
5.1594
3/16
0.1875
4.7625
11/64
0.1719
4.3656
5/32
0.1562
3.9688
9/64
0.1406
3.5719
1/8
0.125
3.175
7/64
0.1094
2.7781
3/32
0.0938
2.3812
5/64
0.0781
1.9844
1/16
0.0625
1.5875
3/64
0.0469
1.1906
1/32
0.0312
0.7937
1/64
0.0156
0.3969