Pipes are an essential part of many different industries, and it is crucial to be able to measure them accurately. The correct pipe size ensures that the pipe can handle the desired amount of fluid or gas and will fit properly in the installation.

There are two main ways to measure pipe size:

  • Outside diameter (OD): This is the measurement of the outside of the pipe. It is the most common way to measure pipe size.

Outside diameter (OD)

  • Inside diameter (ID): This is the measurement of the inside of the pipe. It is less commonly used, but it is important to know the ID when working with pipes that will be carrying fluids or gases.

Inside diameter (ID)

You will need a tape measure to measure the OD of a pipe. Wrap the tape measure around the outside of the line and record the measurement. To calculate the ID of a pipe, you will need a bore gauge. Insert the bore gauge into the tube and record the size.

Here are some additional tips for How to Measure Pipe Size:

  • Make sure that the pipe is clean and dry before you measure it.
  • Do not stretch the tape measure when measuring the OD of the line.
  • Be careful not to damage the bore gauge when measuring the pipe’s ID.

By following these steps, you can measure pipe size accurately and ensure you get the suitable size pipe for your application.

Pipe Sizing Chart

PIPE SCHEDULES WALL THICKNESS (Inches)

Nominal O.D. Inches 10s 10 40s & Std 40 80s & E.H. 80 160
1/8″ .405 .049 .049 .068 .068 .095 .095
1/4″ .540 .065 .065 .088 .088 .119 .119
3/8″ .675 .065 .065 .091 .091 .126 .126
1/2″ .840 .083 .083 .109 .109 .147 .147 .187
3/4″ 1.050 .083 .083 .113 .113 .154 .154 .218
1″ 1.315 .109 .109 .133 .133 .179 .179 .250
1 1/4″ 1.660 .109 .109 .140 .140 .191 .191 .250
1 1/2″ 1.900 .109 .109 .145 .145 .200 .200 .281
2″ 2.375 .109 .109 .154 .154 .218 .218 .343
2 1/2″ 2.875 .120 .120 .203 .203 .276 .276 .375
3″ 3.500 .120 .120 .216 .216 .300 .300 .437
3 1/2″ 4.000 .120 .120 .226 .226 .318 .318
4″ 4.500 .120 .120 .237 .237 .337 .337 .531
4 1/2″ 5.000 .247 .355
5″ 5.563 .134 .134 .258 .258 .375 .375 .625
6″ 6.625 .134 .134 .280 .280 .432 .432 .718
7″ 7.625 .301 .500
8″ 8.625 .148 .148 .322 .322 .500 .500 .906
9″ 9.625 .342 .500
10″ 10.750 .165 .165 .365 .365 .500 .593 1.125
11″ 11.750 .375 .500
12″ 12.750 .180 .180 .375 .406 .500 .687 1.312
14″ 14.000 .188 .250 .375 .437 .500 .750 1.406
16″ 16.000 .188 .250 .375 .500 .500 .843 1.593
18″ 18.000 .188 .250 .375 .562 .500 .937 1.781

PIPE DIMENSIONS & WEIGHT

  • Legend
    • Wall Thickness in inches
    • Steel weight in lbs. per ft.
PIPE O.D. IN
SIZE INCHES 5S 5 10S 10 20 30 40s & STD 40
1/8″ .405 .035
.1383
.049
.1863
.049
.1863
.068
.2447
.068
.2447
1/4″ .540 .049
.2570
.065
.3297
.065
.3297
.088
.4248
.088
.4248
3/8″ .675 .049
.3276
.065
.4235
.065
.4235
.091
.5676
.091
.5676
1/2″ .840 .065
.5383
.065
.5383
.083
.6710
.083
.6710
.109
.8510
.109
.8510
3/4″ 1.050 .065
.6838
.065
.6838
.083
.8572
.083
.8572
.113
1.131
.113
1.131
1″ 1.315 .065
.8678
.065
.8678
.109
1.404
.109
1.404
.133
1.679
.133
1.679
1 1/4″ 1.660 .065
1.107
.065
1.107
.109
1.806
.109
1.806
.140
2.273
.140
2.273
1 1/2″ 1.900 .065
1.274
.065
1.274
.109
2.085
.109
2.085
.145
2.718
.145
2.718
2″ 2.375 .065
1.604
.065
1.604
.109
2.638
.109
2.638
.154
3.653
.154
3.653
2 1/2″ 2.875 .083
2.475
.083
2.475
.120
3.531
.120
3.531
.203
5.793
.203
5.793
3″ 3.500 .083
3.029
.083
3.029
.120
4.332
.120
4.332
.216
7.576
.216
7.576
3 1/2″ 4.000 .083
3.472
.083
3.472
.120
4.973
.120
4.973
.226
9.109
.226
9.109
4″ 4.500 .083
3.915
.083
3.915
.120
5.613
.120
5.613
.237
10.79
.237
10.79
4 1/2″ 5.000 .247
12.53
5″ 5.563 .109
6.349
.109
6.349
.134
7.770
.134
7.770
.258
14.62
.258
14.62
6″ 6.625 .109
7.585
.109
7.585
.134
9.290
.134
9.290
.280
18.97
.280
18.97
7″ 7.625 .301
23.57
8″ 8.625 .109 .109 .148
13.40
.148
13.40
.250
22.36
.277
24.70
.322
28.55
.322
28.55
9″ 9.625 .342
33.9
10″ 10.750 .134
15.19
.134
15.19
.165
18.65
.165
18.65
.250
28.04
.307
34.24
.365
40.48
.365
40.48
11″ 11.750 .375
45.55
12″ 12.750 .156
21.07
.165
22.18
.180
24.17
.180
24.17
.250
33.38
.307
34.24
.365
40.48
.365
40.48
14″ 14.000 .156
23.07
.188
27.73
.250
36.71
.312
45.38
.375
54.57
.375
54.57
.437
63.37
16″ 16.000 .165
27.90
.188
31.75
.250
42.05
.312
52.36
.375
62.58
.375
62.58
.500
82.77
18″ 18.00 .165
31.43
.188
35.76
.250
47.39
.312
59.03
.437
82.06
.375
70.59
.562
104.2
20″ 20.000 .188
39.78
.218
46.05
.250
52.73
.375
78.6
.500
104.1
.375
78.6
.593
122.9
22″ 22.000 .188
43.8
.218
50.71
.250
58.07
.375
86.61
.500
114.81
.375
86.61
24″ 24.000 .218
55.37
.250
63.41
.250
63.41
.375
94.62
.562
140.8
.375
94.62
.687
171.2
26″ 26.000 .312
85.60
.500
136.17
.375
102.63
28″ 28.000 .312
92.26
.500
146.85
.625
182.73
.375
110.64
30″ 30.000 .250
79.43
.312
98.93
.312
98.93
.500
157.53
.625
196.08
.375
118.65
32″ 32.000 .312
105.59
.500
168.21
.625
209.43
.375
126.66
.688
230.08
34″ 34.000 .312
112.25
.500
178.89
.625
222.78
.375
134.667
.688
244.77
36″ 36.000 .312
118.92
.625
236.13
.375
142.68
.750
262.35

60 80S & E.H. 80 100 120 140 160 DBLE. E.H.
.095
.3145
.095
.3145
.119
.5351
.119
.5351
.126
.7338
.126
.7338
.147
1.088
.147
1.088
.187
1.304
.294
1.714
.154
1.474
.154
1.474
.218
1.937
.308
2.441
.179
2.172
.179
2.172
.250
2.844
.358
3.659
.191
2.997
.191
2.997
.250
3.765
.382
5.214
.200
3.631
.200
3.631
.281
4.859
.400
6.408
.218
5.022
.218
5.022
.343
7.444
.436
9.029
.276
7.661
.276
7.661
.375
10.01
.552
13.70
.300
10.25
.300
10.25
.437
14.32
.600
18.58
.318
12.51
.318
12.51
.636
22.85
.281
12.66
.337
14.98
.337
14.98
.437
19.01
.531
22.51
.674
27.54
.355
17.61
.710
32.53
.375
20.78
.375
20.78
.500
27.04
.625
32.96
.750
38.55
.432
28.57
.432
28.57
.562
36.39
.718
45.3
.864
53.16
.500
38.05
.875
63.08
.406
35.64
.500
43.39
.500
43.39
.593
50.87
.718
60.93
.812
67.76
.906
74.69
.885
72.42
.500
48.72
.500
54.74
.500
54.74
.593
64.33
.718
76.93
.843
89.20
1.000
104.1
1.125
115.7
.500
60.07
.500
54.74
.500
54.74
.593
64.33
.718
76.93
.843
89.20
1.000
104.1
1.125
115.7
.593
84.91
.500
72.09
.750
106.1
.937
130.7
1.093
150.7
1.250
170.2
1.406
189.1
.656
107.5
.500
82.77
.843
136.5
1.031
164.8
1.218
192.3
1.427
223.5
1.593
245.1
.750
138.2
.500
93.45
.937
170.8
1.156
208.0
1.375
244.1
1.562
274.2
1.781
308.5
.812
166.4
.500
104.1
1.031
208.9
1.280
256.1
1.500
296.4
1.750
341.1
1.968
379.0
.875
197.41
.500
114.81
1.125
250.81
1.375
302.88
1.625
353.61
1.875
403.0
2.125
451.06
.968
238.1
.500
125.5
1.218
296.4
1.531
367.4
1.812
429.4
2.062
483.1
2.344
542.13
.500
136.17
.500
157.53
.500
168.21
.500
189.57

Here are some other relevant keywords for this topic:

  • pipe size
  • pipe measurement
  • How to Measure Pipe Size Outside Diameter (OD)
  • How to Measure Pipe Size inside diameter (ID)
  • pipe sizing chart
  • How to choose a pipe

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Here are some FAQs about measuring pipe size:

What is the pipe size?

Pipe size is the measurement of a pipe’s inside or outside diameter. It is essential to know the pipe size when working with lines carrying fluids or gases, as it will determine the amount of liquid or gas the pipe can handle.

What are the two main ways to measure pipe size?

The two main ways to measure pipe size are:

Outside diameter (OD): This is the measurement of the outside of the pipe. It is the most common way to measure pipe size.

Inside diameter (ID): This is the measurement of the inside of the pipe. It is less commonly used, but knowing the ID when working with lines carrying fluids or gases is essential.

What tools do I need to measure pipe size?

The tools you need to measure pipe size will depend on your method. You will need a tape measure to measure the OD of a pipe. To calculate the ID of a line, you will need a bore gauge.

How do I measure the OD of a pipe?

To measure the OD of a pipe, wrap the tape measure around the outside of the line and record the measurement. Ensure that the tape measure is level and that you are not stretching it.

How do I measure the ID of a pipe?

To measure the ID of a pipe, insert the bore gauge into the line and record the measurement. Ensure that the bore gauge is inserted into the tube and that you are not damaging the pipe.

What if the pipe is not round?

If the pipe is not round, you will need to measure the largest diameter of the line. This is the most critical measurement for ensuring the pipe can handle the desired fluid or gas.

Where can I find a pipe sizing chart?

Pipe sizing charts are available online and in most plumbing and engineering catalogs. These charts will show you the different sizes of pipes and the corresponding OD and ID measurements.

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