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The following tables represent typical pipe inner diameters.

Click here for Ductile Iron Specs

Nominal Size Copper Type K Copper Type L Copper Type M Copper DWV Steel SCH 40 Steel SCH 80 PVC & PE
SDR 26 		PVC
SDR 35 		PVC
SDR 41 		PVC DR 14
ASTM F-679(T-1) 		Vitrified Clay
1/4" 0.305
900 PSI		 0.315
810 PSI		     0.364 0.302          
3/8" 0.402
990 PSI		 0.430
675 PSI		 0.450
475 PSI		   0.493 0.423          
1/2" 0.527
780 PSI		 0.545
625 PSI		 0.569
430 PSI		   0.622 0.546 Approx ID
0.656		        
5/8" 0.652
640 PSI		 0.666
545 PSI		                  
3/4" 0.745
750 PSI		 0.785
495 PSI		 0.811
350 PSI		   0.824 0.742 Approx ID
0.910		        
1" 0.995
575 PSI		 1.025
440 psl
 1.055
295 PSI		   1.049 0.957 Approx ID
1.175		        
1 1/4" 1.245
465 PSI		 1.265
385 PSI		 1.291
295 PSI		 1.295
275 PSI		 1.38 1.278 Approx ID
1.512		        
1 1/2" 1.481
435 PSI		 1.505
355 PSI		 1.527
290 PSI		 1.541
245 PSI		 1.61 1.5 Approx ID
1.734		        
2" 1.959
380 PSI		 1.985
315 PSI		 2.009
300 PSI		 2.041
185 PSI		 2.067 1.939 Approx ID
2.173		   Approx ID
2.255		    
2 1/2" 2.435
355 PSI		 2.465
295 PSI		 2.495
235 PSI		   2.469 2.323 Approx ID
2.635		        
3" 2.907
340 PSI		 2.945
275 PSI		 2.981
220 PSI		 3.035
135 PSI		 3.068 2.9 Approx ID
3.210		 Approx ID
3.300		     3.000
0.187
3 1/2" 3.385
325 PSI		 3.425
270 PSI		 3.459
215 PSI		   3.548 3.364 Approx ID
3.672		        
4" 3.857
315 PSI		 3.905
255 PSI		 3.935
215 PSI		 4.009
130 PSI		 4.026 3.826 Approx ID
4.134		 Approx ID
3.961		 Approx ID
4.260		   4.000
0.187
5" 4.805
305 PSI		 4.875
235 PSI		 4.907
205 PSI		 4.981
130 PSI		 5.047 4.813 Approx ID
5.108		 5.2 Approx ID
5.271		    
6" 5.741
305 PSI		 5.845
215 PSI		 5.881
190 PSI		 5.959
130 PSI		 5.69 5.386 5.764 Ave
5.612 Base		 5.893 Ave
5.742 Base		 5.951 Ave
5.800 Base		   6.000
0.250
7"             Approx ID
6.577		        
8" 7.583 7.725 7.785   7.981 7.625< 7.715 Ave
70488 Base		 7.891 Ave
7.665 Base		 7.966 Ave
7.740 Base		   8.000
0.310
9"                 8.952 Ave
8.961 Base		    
10" 9.449 9.625 9.701   10.02 9.562 9.664 Ave
9.342 Base		 8.864 Ave
9.563 Base		 9.958 Ave
9.657 Base		   10.0000.380
12" 11.315 11.565 11.617   11.938 11.374 11.480 Ave
11.102 Base		 11.737 Ave
11.361 Base		 11.854 Ave
11.478 Base		   12.000
0.440
13"             Approx ID
12.356		        
14"           13.124 12.5 Approx ID
12.924		   Approx ID
13.316		  
15"           14.503 Ave
13.575 Base		 14.374 Ave
13.898 Base		 14.505 Ave
14.029 Base		   15.000
0.560		  
16"         15.000 13.312 Approx ID
14.770		   Approx ID
15.218		    
18"         16.876 16.124 Approx ID
16.543		   Approx ID
17.120		 17.569 Ave
16.976 Base		 18.000
0.680
20"         18.812 17.938 Approx ID
18.462		   Approx ID
19.022		    
21"                   20.707 Ave
20.009 Base		 21.000
0.810
21 1/2"             Approx ID
19.846		        
22"           19.75          
24"         22.624 21.564 Approx ID
22.154		   Approx ID
22.830		 23.296 Ave
22.480 Base		 24.000
0.940
27"                   26.258 Ave
25.327 Base		 27.000
1.060
30"                     30.000
1.180
33"                     33.000
1.310
36"                     36.000
1.440
39"                     39.000
1.440
Nominal Size Ductile Iron Class 50 Ductile Iron Class 51 Ductile Iron Class 52 Ductile Iron Class 53 Ductile Iron Class 54 Ductile Iron Class 55 Ductile Iron Class 56 Asbestos Cement ASTM C-428 RCP ASTM C-361 Non-Reinforced Concrete Pipe ASTM C-14
1/4"                    
3/8"                    
1/2"                    
5/8"                    
3/4"                    
1"                    
1 1/4"                    
1 1/2"                    
2"                    
2 1/2"                    
3"   3.460 3.400 3.340 3.280 3.220 3.160      
3 1/2"                    
4"   4.280 4.220 4.160 4.100 4.040 3.980 4.000
±0.250		   4.000
±0.187
5"                    
6" 6.400 6.340 6.280 6.220 6.160 6.100 6.040 6.000
±0.250		   6.000
±0.187
7"                    
8" 8.510 8.450 8.390 8.330 8.270 8.210 8.150 8.000
±0.250		   8.000
±0.187
9"                    
10" 10.520 10.460 10.400 10.340 10.280 10.220 10.160 10.000
±0.250		    
12" 12.580 12.520 12.460 12.400 12.340 12.280 12.220 12.000
±0.250		 12.000
±0.180		 12.000
±0.187
13"                    
14" 14.640 14.580 14.520 14.460 14.400 14.340 14.280 14.000
±0.250		    
15"               15.000
±0.250		 15.000
±0.225		 15.000
±0.250
16" 16.720 16.660 16.600 16.540 16.480 16.420 16.360 16.000
±0.250		    
18" 18.800 18.740 18.680 18.620 18.560 18.500 18.440 18.800
±0.280		 18.800
±0.270		 18.800
±0.250
20" 20.880 20.820 20.760 20.700 20.640 20.580 20.520 ±20.000
±0.300		    
21"               21.000
±0.310		 21.000
±0.315		 21.000
±0.312
21 1/2"                    
22"                    
24" 25.040 24.980 24.920 24.860 24.800 24.740 24.680 24.000
±0.360		 24.000
±0.360		 24.000
±0.312
27"               27.000
±0.400		 27.000
±0.375		  
30" 31.220 31.140 31.060 30.980 30.900 30.820 30.740 30.000
±0.450		 30.000
±0.375		 30.000
±0.375
33"               33.000
±0.490		 33.000
±0.375		  
36" 37.440 37.340 37.240 37.140 37.040 36.940 36.840 36.000
±0.540		 36.000
±0.375		 36.000
±0.375
39"                    
The content in this website may be used but with no warranty or liability. This information is believed to be correct but should always be double checked with alternative sources. Strictly adhere to and follow all applicable national and local regulations and practices.
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