pipe size charts

 

Reference Guide: Pipe Size Charts

 

In North America, nominal pipe size (NPS) is the standard for identifying pipe sizes. Outside of North America, pipes are identified by nominal diameter, which approximately equates to the outer diameter (OD) of the pipe in millimeters.

Note that an NPS below 14 approximately refers to the diameter of a pipe measured from the center of the wall material to the opposing side center of the wall material, while an NPS 14 or greater matches the outside diameter of the pipe precisely. 

While NPS defines the OD of a pipe, the pipe schedule is also needed to determine other variants, such as pipe wall thickness and inner diameter (ID). The most prevalent schedule sizes are Schedule 40 and Schedule 80. However, a piping project may stipulate higher schedule numbers.

Use APP's pipe size charts below to quickly reference key measurements for:

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Pipe Dimension Definitions

pipe dimensions

pipe dimensions

Pipe Wall Thickness Chart

NPS O.D. I.D. - Schedule 40 Wall Thickness - Schedule 40 I.D. - Scheduled 80 Wall Thickness - Schedule 80
in. mm in. mm in. mm in. mm in. mm in. mm
1/8 0.125 3.175 0.405 10.287 0.229 5.8166 0.068 1.7272 0.175 4.445 0.095 2.413
1/4 0.25 6.35 0.54 13.716 0.324 8.2296 0.088 2.2352 0.262 6.6548 0.119 3.0226
3/8 0.375 9.525 0.675 17.145 0.453 11.5062 0.091 2.3114 0.383 9.7282 0.126 3.2004
1/2 0.5 12.7 0.84 21.336 0.582 14.7828 0.109 2.7686 0.506 12.8524 0.147 3.7338
3/4 0.75 19.05 1.05 26.67 0.784 19.9136 0.113 2.8702 0.702 17.8308 0.154 3.9116
1 1 25.4 1.315 33.401 1.009 25.6286 0.133 3.3782 0.915 23.241 0.179 4.5466
1 1/4 1.25 31.75 1.66 42.164 1.34 34.036 0.14 3.556 1.232 31.2928 0.191 4.8514
1 1/2 1.5 38.1 1.9 48.26 1.57 39.878 0.145 3.683 1.452 36.8808 0.2 5.08
2 2 50.8 2.375 60.325 2.027 51.4858 0.154 3.9116 1.887 47.9298 0.218 5.5372
2 1/2 2.5 63.5 2.875 73.025 2.421 61.4934 0.203 5.1562 2.257 57.3278 0.276 7.0104
3 3 76.2 3.5 88.9 3.016 76.6064 0.216 5.4864 2.828 71.8312 0.3 7.62
3 1/2 3.5 88.9 4 101.6 3.494 88.7476 0.226 5.7404 3.288 83.5152 0.318 8.0772
4 4 101.6 4.5 114.3 3.97 100.838 0.237 6.0198 3.746 95.1484 0.337 8.5598
4 1/2 4.5 114.3 5 127 4.985 126.619     4.723 119.9642    
5 5 127 5.563 141.3002 5.997 152.3238 0.258 6.5532 5.657 143.6878 0.375 9.525
6 6 152.4 6.625 168.275 7.903 200.7362 0.28 7.112 7.505 190.627 0.432 10.9728
7 7 177.8 7.625 193.675 9.932 252.2728 0.301 7.6454 9.422 239.3188    
8 8 203.2 8.625 219.075 11.84 300.736 0.322 8.1788 11.212 284.7848 0.5 12.7
10 10 254 10.75 273.05     0.365 9.271     0.593 15.0622
12 12 304.8 12.75 323.85     0.365 9.271     0.687 17.4498
14 14 355.6 14 355.6     0.437 11.0998     0.75 19.05
16 16 406.4 16 406.4     0.5 12.7     0.843 21.4122
18 18 457.2 18 457.2     0.5 12.7     0.937 23.7998
20 20 508 20 508     0.593 15.0622     1.031 26.1874
22 22 558.8 22 558.8             1.125 28.575
24 24 609.6 24 609.6     0.687 17.4498     1.218 30.9372
26 26 660.4 26 660.4                
28 28 711.2 28 711.2                
30 30 762 30 762                
32 32 812.8 32 812.8     0.688 17.4752        

 

Copper Nickel Pipe Size Chart

    90/10 90/10 70/30 70/30
NPS O.D. CL 50 Wall CL 200 Wall CL 700 Wall CL 1650 Wall CL 3300 Wall CL 6000 Wall
in. mm in. mm in. mm in. mm in. mm in. mm in. mm in. mm
1/4 OD     0.25 6.35     0.035 0.889         0.035 0.889 0.058 1.4732
1/8 0.125 6.35 0.405 10.287     0.065 1.651         0.058 1.4732 0.095 2.413
1/4 0.25 9.525 0.54 13.716     0.065 1.651 0.065 1.651 0.042 1.0668 0.072 1.8288 0.12 3.048
3/8 0.375 12.7 0.675 17.145     0.065 1.651 0.072 1.8288 0.049 1.2446 0.095 2.413 0.148 3.7592
1/2 0.5 19.05 0.84 21.336     0.065 1.651 0.072 1.8288 0.058 1.4732 0.12 3.048 0.203 5.1562
3/4 0.75 25.4 1.05 26.67     0.065 1.651 0.083 2.1082 0.083 2.1082 0.148 3.7592 0.238 6.0452
1 1 31.75 1.315 33.401     0.065 1.651 0.095 2.413 0.095 2.413 0.18 4.572 0.3 7.62
1 1/4 1.25 38.1 1.66 42.164     0.072 1.8288 0.095 2.413 0.12 3.048 0.22 5.588 0.38 9.652
1 1/2 1.5 50.8 1.9 48.26     0.072 1.8288 0.109 2.7686 0.134 3.4036 0.25 6.35 0.425 10.795
2 2 63.5 2.375 60.325     0.083 2.1082 0.12 3.048 0.165 4.191 0.34 8.636 0.52 13.208
2 1/2 2.5 76.2 2.875 73.025     0.083 2.1082 0.134 3.4036 0.203 5.1562 0.38 9.652    
3 3 88.9 3.5 88.9     0.095 2.413 0.165 4.191 0.25 6.35 0.457 11.6078    
3 1/2 3.5 101.6 4 101.6     0.095 2.413 0.18 4.572 0.284 7.2136        
4 4 114.3 4.5 114.3     0.109 2.7686 0.203 5.1562 0.34 8.636        
4 1/2 4.5 127 5 127     0.109 2.7686                
5 5 152.4 5.563 141.3002     0.125 3.175 0.22 5.588 0.425 10.795        
6 6 177.8 6.625 168.275     0.134 3.4036 0.259 6.5786            
7 7 203.2 7.625 193.675     0.14 3.556 0.284 7.2136            
8 8 228.6 8.625 219.075     0.151 3.8354 0.34 8.636            
9 9 254 9.625 244.475     0.187 4.7498 0.34 8.636            
10 10 304.8 10.75 273.05 0.134 3.4036 0.187 4.7498 0.38 9.652            
12 12 355.6 12.75 323.85 0.156 3.9624 0.25 6.35 0.454 11.5316            
14 14 406.4 14 355.6 0.165 4.191 0.25 6.35                
16 16 457.2 16 406.4 0.165 4.191 0.25 6.35                
18 18 508 18 457.2 0.18 4.572 0.25 6.35                
20 20 0 20 508 0.18 4.572 0.25 6.35                

 

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