Pipe Size Standards

Nominal
Size
Schedule
Number
Outside
Diameter
Inside
Diameter
Wall
Thickness
Inside
Area
Weight
Per Ft.
Metal
Area
1/8
40
80
0.405
0.405
0.269
0.215
0.068
0.095
0.057
0.036
0.245
0.315
0.072
0.093
1/4
40
80
0.540
0.540
0.364
0.302
0.088
0.119
0.104
0.072
0.425
0.535
0.125
0.157
3/8
40
80
0.675
0.675
0.493
0.423
0.091
0.126
0.191
0.141
0.568
0.739
0.167
0.217
1/2
40
80
0.840
0.840
0.622
0.546
0.109
0.147
0.304
0.234
0.851
1.088
0.250
0.320
3/4
40
80
1.050
1.050
0.824
0.742
0.113
0.154
0.533
0.432
1.131
1.474
0.333
0.433
1
40
80
1.315
1.315
1.049
0.957
0.133
0.179
0.864
0.719
1.679
2.172
0.494
0.639
1-1/4
40
80
1.660
1.660
1.380
1.278
0.140
0.191
1.496
1.283
2.273
2.996
0.668
0.881
1-1/2
40
80
1.900
1.900
1.610
1.500
0.145
0.200
2.036
1.767
2.718
3.631
0.799
1.068
2
40
80
2.375
2.375
2.067
1.939
0.154
0.218
3.356
2.953
3.653
5.022
1.074
1.477
2-1/2
40
80
2.875
2.875
2.469
2.323
0.203
0.276
4.788
4.238
5.792
7.660
1.704
2.253
3
40
80
3.5
3.5
3.068
2.900
0.216
0.300
7.393
6.605
7.575
10.252
2.228
3.016
3-1/2
40
80
4
4
3.548
3.364
0.226
0.318
9.887
8.888
9.108
12.504
2.679
3.678
4
40
80
4.5
4.5
4.026
3.826
0.237
0.337
12.730
11.497
10.789
14.982
3.174
4.407
5
40
80
5.563
5.563
5.047
4.813
0.258
0.375
20.006
18.194
14.615
20.776
4.299
6.111
6
40
80
6.625
6.625
6.065
5.761
0.280
0.432
28.890
26.607
18.971
28.570
5.580
8.404
8
40
80
8.625
8.625
7.981
7.625
0.322
0.500
50.027
45.664
28.548
43.382
8.397
12.761
10
40
80
10.750
10.750
10.020
9.750
0.365
0.500
78.854
74.662
40.474
54.726
11.905
16.098
12
40
80
12.750
12.750
11.938
11.750
0.406
0.500
111.932
108.434
53.512
65.402
15.741
19.238