- A 4 inches (100 mm) Schedule 40 pipe has an outside diameter of 4.500 inches (114.30 mm), a wall thickness of 0.237 inches (6.02 mm), giving a bore of 4.026 inches (102.26 mm).

- A 4 inches (100 mm) Schedule 80 pipe has an outside diameter of 4.500 inches ( 114.30 mm), a wall thickness of 0.337 inches (8.56 mm), giving a bore of 3.826 inches  (97.18 mm).

Pipe Size (inches)	Outside Diameter (inches)	Identification			Wall Thickness - t - (inches)	Inside Diameter - d - (inches)	Area of Metal (square inches)	Transverse Internal Area		Moment of Inertia - - l - (inches)	Weight Pipe (pounds per foot)	Weight Water (pounds per foot)	External Surface (square feet per foot of pipe)
		Steel		Stainless Steel Schedule No.
								- a - (square inches)	- A - (square feet)
		Iron Pipe Size	Schedule No.
1/8	0.405	. STD XS	. 40 80	10S 40S 80S	.049 .068 .095	.307 .269 .215	.0548 .0720 .0925	.0740 .0568 .0364	.00051 .00040 .00025	.00088 .00106 .00122	.19 .24 .31	.032 .025 .016	.106 .106 .106
¼	0.540	. STD XS	.  40 80	10S 40S 80S	.065 .088 .119	.410 .364 .302	.0970 .1250 .1574	.1320 .1041 .0716	.00091 .00072 .00050	.00279 .00331 .00377	.33 .42 .54	.057 .045 .031	.141 .141 .141
3/8	0.675	. STD XS	. 40 80	10S 40S 80S	.065 .091 .126	.545 .493 .423	.1246 .1670 .2173	.2333 .1910 .1405	.00162 .00133 .00098	.00586 .00729 .00862	.42 .57 .74	.101 .083 .061	.178 .178 .178
½	0.840	. . STD XS . XXS	. . 40 80 160 .	5S 10S 40S 80S . .	.065 .083 .109 .147 .187 .294	.710 .674 .622 .546 .466 .252	.1583 .1974 .2503 .3200 .3836 .5043	.3959 .3568 .3040 .2340 .1706 .050	.00275 .00248 .00211 .00163 .00118 .00035	.01197 .01431 .01709 .02008 .02212 .02424	.54 .67 .85 1.09 1.31 1.71	.172 .155 .132 .102 .074 .022	.220 .220 220 .220 220 .220
¾	1.050	. . STD XS . XXS	. . 40 80 160 .	5S 10S 40S 80S . .	.065 .083 .113 .154 .219 .308	.920 .884 .824 .742 .612 .434	.2011 .2521 .3326 .4335 .5698 .7180	.6648 .6138 .5330 .4330 .2961 .148	.00462 .00426 .00371 .00300 .00206 .00103	.02450 .02969 .03704 .04479 .05269 .05792	.69 .86 1.13 1.47 1.94 2.44	.288 .266 .231 .188 .128 .064	.275 .275 .275 .275 .275 .275
1	1.315	. . STD XS . XXS	. . 40 80 160 .	5S 10S 40S 80S . .	.065 .109 .133 .179 .250 .358	1.185 1.097 1.049 .957 .815 .599	.2553 .4130 .4939 .6388 .8365 1.0760	1.1029 .9452 .8640 .7190 .5217 .282	.00766 .00656 .00600 .00499 .00362 .00196	.04999 .07569 .08734 .1056 .1251 .1405	.87 1.40 1.68 2.17 2.84 3.66	.478 .409 .375 .312 .230 .122	.344 .344 .344 .344 .344 .344
1 ¼	1.660	. . STD XS . XXS	. . 40 80 160 .	5S 10S 40S 80S . .	.065 .109 .140 .191 .250 .382	1.530 1.442 1.380 1.278 1.160 .896	.3257 .4717 .6685 .8815 1.1070 1.534	1.839 1.633 1.495 1.283 1.057 .630	.01277 .01134 .01040 .00891 .00734 .00438	.1038 .1605 .1947 .2418 .2839 .3411	1.11 1.81 2.27 3.00 3.76 5.21	.797 .708 .649 .555 .458 .273	.435 .435 .435 .435 .435 .435
1 ½	1.900	. . STD XS . XXS	. . 40 80 160 .	5S 10S 40S 80S . .	.065 .109 .145 .200 .281 .400	1.770 1.682 1.610 1.500 1.338 1.100	.3747 .6133 .7995 1.068 1.429 1.885	2.461 2.222 2.036 1.767 1.406 .950	.01709 .01543 .01414 .01225 .00976 .00660	.1579 .2468 .3099 .3912 .4824 .5678	1.28 2.09 2.72 3.63 4.86 6.41	1.066 .963 .882 .765 .608 .42	.497 .497 .497 .497 .497 .497
2	2.375	. . STD XS . XXS	. . 40 80 160 .	5S 10S 40S 80S . .	.065 .109 .154 .218 .344 .436	2.245 2.157 2.067 1.939 1.687 1.503	.4717 .7760 1.075 1.477 2.190 2.656	3.958 3.654 3.355 2.953 2.241 1.774	.02749 .02538 .02330 .02050 .01556 .01232	.3149 .4992 .6657 .8679 1.162 1.311	1.61 2.64 3.65 5.02 7.46 9.03	1.72 1.58 1.45 1.28 .97 .77	.622 .622 .622 .622 .622 .622
2 ½	2.875	. . STD XS . XXS	. . 40 80 160 .	5S 10S 40S 80S . .	.083 .120 .203 .276 .375 .552	2.709 2.635 2.469 2.323 2.125 1.771	.7280 1.039 1.704 2.254 2.945 4.028	5.764 5.453 4.788 4.238 3.546 2.464	.04002 .03787 .03322 .02942 .02463 .01710	.7100 .9873 1.530 1.924 2.353 2.871	2.48 3.53 5.79 7.66 10.01 13.69	2.50 2.36 2.07 1.87 1.54 1.07	.753 .753 .753 .753 .753 .753
3	3.500	. . STD XS . XXS	. . 40 80 160 .	5S 10S 40S 80S . .	.083 .120 .216 .300 .438 .600	3.334 3.260 3.068 2.900 2.624 2.300	.8910 1.274 2.228 3.016 4.205 5.466	8.730 8.347 7.393 6.605 5.408 4.155	.06063 .05796 .05130 .04587 .03755 .02885	1.301 1.822 3.017 3.894 5.032 5.993	3.03 4.33 7.58 10.25 14.32 18.58	3.78 3.62 3.20 2.6 2.35 1.80	.916 .916 .916 .916 .916 .916
3 ½	4.000	. . STD XS	. . 40 80	5S 10S 40S 80S	.083 .120 .226 .318	3.834 3.760 3.548 3.364	1.021 1.463 2.680 3.678	11.545 11.104 9.886 8.888	.08017 .07711 .06870 .06170	1.960 2.755 4.788 6.280	3.48 4.97 9.11 12.50	5.00 4.81 4.29 3.84	1.047 1.047 1.047 1.047
4	4.500	. . STD XS . . XXS	. . 40 80 120 160 .	5S 10S 40S 80S . . .	.083 .120 .237 .337 .438 .531 .674	4.334 4.260 4.026 3.826 3.624 3.438 3.152	1.152 1.651 3.174 4.407 5.595 6.621 8.101	14.75 14.25 12.73 11.50 10.31 9.28 7.80	.10245 .09898 .08840 .07986 .0716 .0645 .0542	2.810 3.963 7.233 9.610 11.65 13.27 15.28	3.92 5.61 10.79 14.98 19.0 22.51 27.54	6.39 6.18 5.50 4.98 4.47 4.02 3.38	1.178 1.178 1.178 1.178 1.178 1.178 1.178
5	5.563	. . STD XS . . XXS	. . 40 80 120 160 .	5S 10S 40S 80S . . .	.109 .134 .258 .375 .500 .625 .750	5.345 5.295 5.047 4.813 4.563 4.313 4.063	1.868 2.285 4.300 6.112 7.953 9.696 11.340	22.44 22.02 20.01 18.19 16.35 14.61 12.97	.1558 .1529 .1390 .1263 .1136 .1015 .0901	6.947 8.425 15.16 20.67 25.73 30.03 33.63	6.36 7.77 14.62 20.78 27.04 32.96 38.55	9.72 9.54 8.67 7.88 7.09 6.33 5.61	1.456 1.456 1.456 1.456 1.456 1.456 1.456
6	6.625	. . STD XS . . XXS	. . 40 80 120 160 .	5S 10S 40S 80S . . .	.109 .134 .280 .432 .562 .718 .864	6.407 6.357 6.065 5.761 5.501 5.187 4.897	2.231 2.733 5.581 8.405 10.70 13.32 15.64	32.24 31.74 28.89 26.07 23.77 21.15 18.84	.2239 .2204 .2006 .1810 .1650 .1469 .1308	11.85 14.40 28.14 40.49 49.61 58.97 66.33	7.60 9.29 18.97 28.57 36.39 45.35 53.16	13.97 13.75 12.51 11.29 10.30 9.16 8.16	1.734 1.734 1.734 1.734 1.734 1.734 1.734
8	8.625	. . . . STD . XS . . . XXS .	. . 20 30 40 60 80 100 120 140 . 160	5S 10S . . 40S . 80S . . . . .	.109 .148 .250 .277 .322 .406 .500 .594 .719 .812 .875 .906	8.407 8.329 8.125 8.071 7.981 7.813 7.625 7.437 7.187 7.001 6.875 6.813	2.916 3.941 6.57 7.26 8.40 10.48 12.76 14.96 17.84 19.93 21.30 21.97	55.51 54.48 51.85 51.16 50.03 47.94 45.66 43.46 40.59 38.50 37.12 36.46	.3855 .3784 .3601 .3553 .3474 .3329 .3171 .3018 .2819 .2673 .2578 .2532	26.44 35.41 57.72 63.35 72.49 88.73 105.7 121.3 140.5 153.7 162.0 165.9	9.93 13.40 22.36 24.70 28.55 35.64 43.39 50.95 60.71 67.76 72.42 74.69	24.06 23.61 22.47 22.17 21.70 20.77 19.78 18.83 17.59 16.68 16.10 15.80	2.258 2.258 2.258 2.258 2.258 2.258 2.258 2.258 2.258 2.258 2.258 2.258
10	10.750	. . . . STD XS . . . . .	. . 20 30 40 60 80 100 120 140 160	5S 10S . . 40S 80S . . . . .	.134 .165 .250 .307 .365 .500 .594 .719 .844 1.000 1.125	10.482 10.420 10.250 10.136 10.020 9.750 9.562 9.312 9.062 8.750 8.500	4.36 5.49 8.24 10.07 11.90 16.10 18.92 22.63 26.24 30.63 34.02	86.29 85.28 82.52 80.69 78.86 74.66 71.84 68.13 64.53 60.13 56.75	.5992 .5922 .5731 .5603 .5475 .5185 .4989 .4732 .4481 .4176 .3941	63.0 76.9 113.7 137.4 160.7 212.0 244.8 286.1 324.2 367.8 399.3	15.19 18.65 28.04 34.24 40.48 54.74 64.43 77.03 89.29 104.13 115.64	37.39 36.95 35.76 34.96 34.20 32.35 31.13 29.53 27.96 26.06 24.59	2.814 2.814 2.814 2.814 2.814 2.814 2.814 2.814 2.814 2.814 2.814
12	12.75	. . . . STD . XS . . . . . .	. . 20 30 . 40 . 60 80 100 120 140 160	5S 10S . . 40S . 80S . . . . . .	.156 .180 .250 .330 .375 .406 .500 .562 .688 .844 1.000 1.125 1.312	12.438 12.390 12.250 12.090 12.000 11.938 11.750 11.626 11.374 11.062 10.750 10.500 10.126	6.17 7.11 9.82 12.87 14.58 15.77 19.24 21.52 26.03 31.53 36.91 41.08 47.14	121.50 120.57 117.86 114.80 113.10 111.93 108.43 106.16 101.64 96.14 90.76 86.59 80.53	.8438 .8373 .8185 .7972 .7854 .7773 .7528 .7372 .7058 .6677 .6303 .6013 .5592	122.4 140.4 191.8 248.4 279.3 300.3 361.5 400.4 475.1 561.6 641.6 700.5 781.1	20.98 24.17 33.38 43.77 49.56 53.52 65.42 73.15 88.63 107.32 125.49 139.67 160.27	52.65 52.25 51.07 49.74 49.00 48.50 46.92 46.00 44.04 41.66 39.33 37.52 34.89	3.338 3.338 3.338 3.338 3.338 3.338 3.338 3.338 3.338 3.338 3.338 3.338 3.338
14	14.00	. . . . STD . XS . . . . . ..	. . 10 20 30 40 . 60 80 100 120 140 160	5S 10S . . . . . . . . . . .	156 .188 .250 .312 .375 .438 .500 .594 .750 .938 1.094 1.250 1.406	13.688 13.624 13.500 13.376 13.250 13.124 13.000 12.812 12.500 12.124 11.812 11.500 11.188	6.78 8.16 10.80 13.42 16.05 18.66 21.21 24.98 31.22 38.45 44.32 50.07 55.63	147.15 145.78 143.14 140.52 137.88 135.28 132.73 128.96 122.72 115.49 109.62 103.87 98.31	1.0219 1.0124 .9940 .9758 .9575 .9394 .9217 .8956 .8522 .8020 .7612 .7213 .6827	162.6 194.6 255.3 314.4 372.8 429.1 483.8 562.3 678.3 824.4 929.6 1027.0 1117.0	23.07 27.73 36.71 45.61 54.57 63.44 72.09 85.05 106.13 130.85 150.79 170.28 189.11	63.77 63.17 62.03 60.89 59.75 58.64 57.46 55.86 53.18 50.04 47.45 45.01 42.60	3.665 3.665 3.665 3.665 3.665 3.665 3.665 3.665 3.665 3.665 3.665 3.665 3.665
16	16.00	. . . . STD XS . . . . . .	. . 10 20 30 40 60 80 100 120 140 160	5S 10S . . . . . . . . . .	.165 .188 .250 .312 .375 .500 .656 .844 1.031 1.219 1.438 1.594	15.670 15.624 15.500 15.376 15.250 15.000 14.688 14.312 13.938 13.562 13.124 12.812	8.21 9.34 12.37 15.38 18.41 24.35 31.62 40.14 48.48 56.56 65.78 72.10	192.85 191.72 188.69 185.69 182.65 176.72 169.44 160.92 152.58 144.50 135.28 128.96	1.3393 1.3314 1.3103 1.2895 1.2684 1.2272 1.1766 1.175 1.0596 1.0035 .9394 .8956	257.3 291.9 383.7 473.2 562.1 731.9 932.4 1155.8 1364.5 1555.8 1760.3 1893.5	27.90 31.75 42.05 52.27 62.58 82.77 107.50 136.61 164.82 192.43 223.64 245.25	83.57 83.08 81.74 80.50 79.12 76.58 73.42 69.73 66.12 62.62 58.64 55.83	4.189 4.189 4.189 4.189 4.189 4.189 4.189 4.189 4.189 4.189 4.189 4.189
18	18.00	. . . . STD . XS . . . . . . .	. . 10 20 . 30 . 40 60 80 100 120 140 160	5S 10S . . . . . . . . . . . .	.165 .188 .250 .312 .375 .438 .500 .562 .750 .938 1.156 1.375 1.562 1.781	17.670 17.624 17.500 17.376 17.250 17.124 17.000 16.876 16.500 16.124 15.688 15.250 14.876 14.438	9.25 10.52 13.94 17.34 20.76 24.17 27.49 30.79 40.64 50.23 61.17 71.81 80.66 90.75	245.22 243.95 240.53 237.13 233.71 230.30 226.98 223.68 213.83 204.24 193.30 182.66 173.80 163.72	1.7029 1.6941 1.6703 1.6467 1.6230 1.5990 1.5763 1.5533 1.4849 1.4183 1.3423 1.2684 1.2070 1.1369	367.6 417.3 549.1 678.2 806.7 930.3 1053.2 1171.5 1514.7 1833.0 2180.0 2498.1 2749.0 3020.0	31.43 35.76 47.39 58.94 70.59 82.15 93.45 104.67 138.17 170.92 207.96 244.14 274.22 308.50	106.26 105.71 104.21 102.77 101.18 99.84 98.27 96.93 92.57 88.50 83.76 79.07 75.32 70.88	4.712 4.712 4.712 4.712 4.712 4.712 4.712 4.712 4.712 4.712 4.712 4.712 4.712 4.712
20	20.00	. . . STD XS . . . . . . .	. . 10 20 30 40 60 80 100 120 140 160	5S 10S . . . . . . . . . .	.188 .218 .250 .375 .500 .594 .812 1.031 1.281 1.500 1.750 1.969	19.624 19.564 19.500 19.250 19.000 18.812 18.376 17.938 17.438 17.000 16.500 16.062	11.70 13.55 15.51 23.12 30.63 36.15 48.95 61.44 75.33 87.18 100.33 111.49	302.46 300.61 298.65 290.04 283.53 278.00 265.21 252.72 238.83 226.98 213.82 202.67	2.1004 2.0876 2.0740 2.0142 1.9690 1.9305 1.8417 1.7550 1.6585 1.5762 1.4849 1.4074	574.2 662.8 765.4 1113.0 1457.0 1703.0 2257.0 2772.0 3315.2 3754.0 4216.0 4585.5	39.78 46.06 52.73 78.60 104.13 123.11 166.40 208.87 256.10 296.37 341.09 379.17	131.06 130.27 129.42 125.67 122.87 120.46 114.92 109.51 103.39 98.35 92.66 87.74	5.236 5.236 5.236 5.236 5.236 5.236 5.236 5.236 5.236 5.236 5.236 5.236
22	22.00	. . . STD XS . . . . . .	. . 10 20 30 60 80 100 120 140 160	5S 10S . . . . . . . . .	.188 .218 .250 .375 .500 .875 1.125 1.375 1.625 1.875 2.125	21.624 21.564 21.500 21.250 21.000 20.250 19.75 19.25 18.75 18.25 17.75	12.88 14.92 17.08 25.48 33.77 58.07 73.78 89.09 104.02 118.55 132.68	367.25 365.21 363.05 354.66 346.36 322.06 306.35 291.04 276.12 261.59 247.45	2.5503 2.5362 2.5212 2.4629 2.4053 2.2365 2.1275 2.0211 1.9175 1.8166 1.71840	766.2 884.8 1010.3 1489.7 1952.5 3244.9 4030.4 4758.5 5432.0 6053.7 6626.4	43.80 50.71 58.07 86.61 114.81 197.41 250.81 302.88 353.61 403.00 451.06	159.14 158.26 157.32 153.68 150.09 139.56 132.76 126.12 119.65 113.36 107.23	5.760 5.760 5.760 5.760 5.760 5.760 5.760 5.760 5.760 5.760 5.760
24	24.00	. . STD XS . . . . . . . .	. 10 20 . 30 40 60 80 100 120 140 160	5S 10S . . . . . . . . . .	.218 .250 .375 .500 .562 .688 .969 1.219 1.531 1.812 2.062 2.344	23.564 23.500 23.250 23.000 22.876 22.624 22.062 21.562 20.938 20.376 19.876 19.312	16.29 18.65 27.83 36.91 41.39 50.31 70.04 87.17 108.07 126.31 142.11 159.41	436.10 433.74 424.56 415.48 411.00 402.07 382.35 365.22 344.32 326.08 310.28 292.98	3.0285 3.0121 2.9483 2.8853 2.8542 2.7921 2.6552 2.5362 2.3911 2.2645 2.1547 2.0346	1151.6 1315.4 1942.0 2549.5 2843.0 3421.3 4652.8 5672.0 6849.9 7825.0 8625.0 9455.9	55.37 63.41 94.62 125.49 140.68 171.29 238.35 296.58 367.39 429.39 483.12 542.13	188.98 187.95 183.95 179.87 178.09 174.23 165.52 158.26 149.06 141.17 134.45 126.84	6.283 6.283 6.283 6.283 6.283 6.283 6.283 6.283 6.283 6.283 6.283 6.283
26	26.00	. STD XS	10 . 20	. . .	.312 .375 .500	25.376 25.250 25.000	25.18 30.19 40.06	505.75 500.74 490.87	3.5122 3.4774 3.4088	2077.2 2478.4 3257.0	85.60 102.63 136.17	219.16 216.99 212.71	6.806 6.806 6.806
28	28.00	. STD XS .	10 . 20 30	. . . .	.312 .375 .500 .625	27.376 27.250 27.000 26.750	27.14 32.54 43.20 53.75	588.61 583.21 572.56 562.00	4.0876 4.0501 3.9761 3.9028	2601.0 3105.1 4084.8 5037.7	92.26 110.64 146.85 182.73	255.07 252.73 248.11 243.53	7.330 7.330 7.330 7.330
30	30.00	. . STD XS .	. 10 . 20 30	5S 10S . . .	.250 .312 .375 .500 .625	29.500 29.376 29.250 29.000 28.750	23.37 29.10 34.90 46.34 57.68	683.49 677.76 671.96 660.52 649.18	4.7465 4.7067 4.6664 4.5869 4.5082	2585.2 3206.3 3829.4 5042.2 6224.0	79.43 98.93 118.65 157.53 196.08	296.18 293.70 291.18 286.22 281.31	7.854 7.854 7.854 7.854 7.854
32	32.00	. STD XS . .	10 . 20 30 40	. . . . .	.312 .375 .500 .625 .688	31.376 31.250 31.000 30.750 30.624	31.06 37.26 49.48 61.60 67.68	773.19 766.99 754.77 742.64 736.57	5.3694 5.3263 5.2414 5.1572 5.1151	3898.9 4658.5 6138.6 7583.4 8298.3	105.59 126.66 168.21 209.43 230.08	335.05 332.36 327.06 321.81 319.18	8.378 8.378 8.378 8.378 8.378
34	34.00	. STD XS . .	10 . 20 30 40	. . . . .	.344 .375 .500 .625 .688	33.312 33.250 33.000 32.750 32.624	36.37 39.61 52.62 65.53 72.00	871.55 868.31 855.30 842.39 835.92	6.0524 6.0299 5.9396 5.8499 5.8050	5150.5 5599.3 7383.5 9127.6 9991.6	123.65 134.67 178.89 222.78 244.77	377.67 376.27 370.63 365.03 362.23	8.901 8.901 8.901 8.901 8.901
36	36.00	. STD XS . .	10 . 20 30 40	. . . . .	.312 .375 .500 .625 .750	35.376 35.250 35.000 34.750 34.500	34.98 41.97 55.76 69.46 83.06	982.90 975.91 962.11 948.42 934.82	6.8257 6.7771 6.6813 6.5862 6.4918	5569.5 6658.9 8786.2 10868.4 12906.1	118.92 142.68 189.57 236.13 282.35	425.92 422.89 416.91 417.22 405.09	9.425 9.425 9.425 9.425 9.425
42	42.00	STD XS . .	. 20 30 40	. . . .	.375 .500 .625 .750	41.250 41.000 40.720 40.500	49.08 65.18 81.28 97.23	1336.3 1320.2 1304.1 1288.2	. . . .	10627 14037 17373 20689	167 222 276 330	579.3 572.3 565.4 558.4	10.99 10.99 10.99 10.99

1 in (inch) = 25.4 mm STD, XS and XXS To distinguish different weights of pipe, three long standing traditional designations are used: standard wall (Std.), extra strong wall (XS), and double extra strong wall (XXS). These last two designations are sometimes referred to as extra heavy wall (XH), and double extra heavy wall (XXH).