Pipe size does not refer to the inside or outside diameters (ID or OD) of a pipe fitting or pipe itself. It is the accepted industry designation, not an actual size.For example, all pipe and male pipe fittings with a 1/2" pipe size have an actual OD measurement of 0.840".
When matching pipe OD for male threads and pipe ID for female threads, they must be the same pipe size.
Note:The terms pipe size, IPS, and nominal pipe size all mean the same thing.
Schedule 40 PVC Dimensions
| Nom. Pipe Size (in) |
O.D. |
Average I.D. |
Min. Wall |
Nom. Wt./Ft. |
Max. W.P. PSI** |
| 1/8" |
0.405 |
0.249 |
0.068 |
0.051 |
810 |
| 1/4" |
0.540 |
0.344 |
0.088 |
0.086 |
780 |
| 3/8" |
0.675 |
0.473 |
0.091 |
0.115 |
620 |
| 1/2" |
0.840 |
0.602 |
0.109 |
0.170 |
600 |
| 3/4" |
1.050 |
0.804 |
0.113 |
0.226 |
480 |
| 1" |
1.315 |
1.029 |
0.133 |
0.333 |
450 |
| 1-1/4" |
1.660 |
1.360 |
0.140 |
0.450 |
370 |
| 1-1/2" |
1.900 |
1.590 |
0.145 |
0.537 |
330 |
| 2" |
2.375 |
2.047 |
0.154 |
0.720 |
280 |
| 2-1/2" |
2.875 |
2.445 |
0.203 |
1.136 |
300 |
| 3" |
3.500 |
3.042 |
0.216 |
1.488 |
260 |
| 3-1/2" |
4.000 |
3.521 |
0.226 |
1.789 |
240 |
| 4" |
4.500 |
3.998 |
0.237 |
2.118 |
220 |
| 5" |
5.563 |
5.016 |
0.258 |
2.874 |
190 |
| 6" |
6.625 |
6.031 |
0.280 |
3.733 |
180 |
| 8" |
8.625 |
7.942 |
0.322 |
5.619 |
160 |
| 10" |
10.750 |
9.976 |
0.365 |
7.966 |
140 |
| 12" |
12.750 |
11.889 |
0.406 |
10.534 |
130 |
| 14" |
14.000 |
13.073 |
0.437 |
12.462 |
130 |
| 16" |
16.000 |
14.940 |
0.500 |
16.286 |
130 |
| 18" |
18.000 |
16.809 |
0.562 |
20.587 |
130 |
| 20" |
20.000 |
18.743 |
0.593 |
24.183 |
120 |
| 24" |
24.000 |
22.544 |
0.687 |
33.652 |
120 |
Schedule 80 PVC Dimensions
| Nom. Pipe Size (in) |
O.D. |
Average I.D. |
Min. Wall |
Nom. Wt./Ft. |
Max. W.P. PSI** |
| 1/8" |
.405 |
.195 |
0.095 |
0.063 |
1230 |
| 1/4" |
.540 |
.282 |
0.119 |
0.105 |
1130 |
| 3/8" |
.675 |
.403 |
0.126 |
0.146 |
920 |
| 1/2" |
.840 |
.526 |
0.147 |
0.213 |
850 |
| 3/4" |
1.050 |
.722 |
0.154 |
0.289 |
690 |
| 1" |
1.315 |
.936 |
0.179 |
0.424 |
630 |
| 1-1/4" |
1.660 |
1.255 |
0.191 |
0.586 |
520 |
| 1-1/2" |
1.900 |
1.476 |
0.200 |
0.711 |
470 |
| 2" |
2.375 |
1.913 |
0.218 |
0.984 |
400 |
| 2-1/2" |
2.875 |
2.290 |
0.276 |
1.500 |
420 |
| 3" |
3.500 |
2.864 |
0.300 |
2.010 |
370 |
| 3-1/2" |
4.000 |
3.326 |
0.318 |
2.452 |
350 |
| 4" |
4.500 |
3.786 |
0.337 |
2.938 |
320 |
| 5" |
5.563 |
4.768 |
0.375 |
4.078 |
290 |
| 6" |
6.625 |
5.709 |
0.432 |
5.610 |
280 |
| 8" |
8.625 |
7.565 |
0.500 |
8.522 |
250 |
| 10" |
10.750 |
9.493 |
0.593 |
12.635 |
230 |
| 12" |
12.750 |
11.294 |
0.687 |
17.384 |
230 |
| 14" |
14.000 |
12.410 |
0.750 |
20.852 |
220 |
| 16" |
16.000 |
14.213 |
0.843 |
26.810 |
220 |
| 18" |
18.000 |
16.014 |
0.937 |
33.544 |
220 |
| 20" |
20.000 |
17.814 |
1.031 |
41.047 |
220 |
| 24" |
24.000 |
21.418 |
1.218 |
58.233 |
210 |
source: https://www.gfps.com/en-us.html
Title: What is pipe size?
Description: Definition of pipe size.
Published: 7/9/2003
Last Edited: 1/3/2023
Information disclaimer:
The information contained in this article is for general information purposes only. The information is provided by
United States Plastic Corp. and while we endeavor to keep the information up to date and correct, we make no representations or
warranties of any kind, express or implied, about the completeness, accuracy, reliability, suitability or availability with
respect to the website or the information, products, services, or related graphics contained on the website for any purpose.
Any reliance you place on such information is therefore strictly at your own risk.
In no event will we be liable for any loss or damage including without limitation, indirect or consequential loss
or damage, or any loss or damage whatsoever arising from loss of materials, time or profits arising out of,
or in connection with, the use of this information.