The Chicago Plumbing Code

Fractional Inches to Decimal Inches

Fraction Decimal Inches Millimeters
1⁄64” 0.015625 0.396875
1⁄32” 0.03125 0.79375
3⁄64” 0.046875 1.190625
1⁄16” 0.0625 1.5875
5⁄64” 0.078125 1.984375
3⁄32” 0.09375 2.38125
7⁄64” 0.109375 2.778125
1⁄8” 0.125 3.175
9⁄64” 0.140625 3.571875
5⁄32” 0.15625 3.96875
11⁄64” 0.171875 4.365625
3⁄16” 0.1875 4.7625
13⁄64” 0.203125 5.159375
7⁄32” 0.21875 5.55625
15⁄64” 0.234375 5.953125
1⁄4” 0.25 6.35
17⁄64” 0.265625 6.746875
9⁄32” 0.28125 7.14375
19⁄64” 0.296875 7.540625
5⁄16” 0.3125 7.9375
21⁄64” 0.328125 8.334375
11⁄32” 0.34375 8.73125
23⁄64” 0.359375 9.128125
3⁄8” 0.375 9.525
25⁄64” 0.390625 9.921875
13⁄32” 0.40625 10.31875
27⁄64” 0.421875 10.715625
7⁄16” 0.4375 11.1125
29⁄64” 0.453125 11.509375
15⁄32” 0.46875 11.90625
31⁄64” 0.484375 12.303125
1⁄2” 0.5 12.7
33⁄64” 0.515625 13.096875
17⁄32” 0.53125 13.49375
35⁄64” 0.546875 13.890625
9⁄16” 0.5625 14.2875
37⁄64” 0.578125 14.684375
19⁄32” 0.59375 15.08125
39⁄64” 0.609375 15.478125
5⁄8” 0.625 15.875
41⁄64” 0.640625 16.271875
21⁄32” 0.65625 16.66875
43⁄64” 0.671875 17.065625
11⁄16” 0.6875 17.4625
45⁄64” 0.703125 17.859375
23⁄32” 0.71875 18.25625
47⁄64” 0.734375 18.653125
3⁄4” 0.75 19.05
49⁄64” 0.765625 19.446875
25⁄32” 0.78125 19.84375
51⁄64” 0.796875 20.240625
13⁄16” 0.8125 20.6375
53⁄64” 0.828125 21.034375
27⁄32” 0.84375 21.43125
55⁄64” 0.859375 21.828125
7⁄8” 0.875 22.225
57⁄64” 0.890625 22.621875
29⁄32” 0.90625 23.01875
59⁄64” 0.921875 23.415625
15⁄16” 0.9375 23.8125
61⁄64” 0.953125 24.209375
31⁄32” 0.96875 24.60625
63⁄64” 0.984375 25.003125
1″ 1 25.4