What is Pipe Schedule? Pipe Size chart and Pipe Schedule 40 thickness (2025)

Understanding the basics of pipe schedules can help you better understand pipes’ role in construction, plumbing, and other related industries. Pipe schedule is an industry term that describes the thickness of the wall of a pipe. It’s a measure used to distinguish different types of pipes and determine their strength. Let’s take a closer look at what pipe schedule means, why it matters, and how it affects your projects.

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What Does Pipe Schedule Mean?

Pipe schedule or pipe schedule number is an industry term used to describe a pipe’s wall thickness. It’s typically measured in inches; for example, a 12-inch steel pipe will have a 12-inch outside diameter (OD), but its internal diameter (ID) will be slightly smaller due to its wall thickness. This piping number reflects how much material makes up the walls of the pipe – if it’s thicker, it means more material and more strength for pressure applications. The higher number indicates thicker walls, which also helps transport liquids easier as there is less friction on the interior surface.

How to Calculate a Pipe Schedule?

Calculating pipe schedule can seem like an intimidating task, but with the right tools and guide it can actually be quite straightforward. Pipe schedules are calculated by first determining the nominal pipe size (NPS). This is determined by measuring the internal diameter of the pipe in inches. Next, using a pressure-temperature rating chart, determine the maximum operating pressure allowed for that pipe. Finally, use this information to select from three different thickness classes – standard, extra strong, and double extra strong – to match your desired schedule. With this method everybody you can calculate your own custom pipe schedule with ease!

Schedule Numbers for pipe size/wall thicknesscombinations are calculated (approximated) to get a uniform relationship equal to1000 times the P/S(P=Design Pressure and S=Allowable Stress) expression contained in the modified Barlow formula for pipe wall thickness.

Pipe Schedule vs pipe size

Pipe schedules and pipe sizes are two separate items, but they are often confused. Pipe schedules refer to the wall thickness of a pipe and are determined by the pressure inside and outside of the pipe. On the other hand, pipe size indicates the actual diameter within the pipe that allows fluid to flow through it. Even if two pipes are equal in size, different schedule pipes won’t have the same strength due to differences in their walls. It is also important to note that even though smaller pipes generally require less pressure for fluid flow, larger ones can reduce friction losses due to their smooth interior surfaces. Although both concepts are related, it is essential for individuals working in plumbing or other related fields to understand how they differentiate one another.

Why Does Pipe Schedule Matter?

Pipe schedule matters because different applications require different levels of strength and durability. For instance, if you are dealing with compressed air or natural gas pipelines, you need stronger pipes that can handle higher levels of pressure over time without breaking or leaking. On the other hand, if you are working on plumbing systems, thinner pipes may be adequate as long as they can hold up in everyday use cases, such as running hot and cold water through them reliably without being prone to cracking or bursting under pressure. The right choice depends on both short-term needs and long-term goals for whatever project you are working on – something that can easily be determined through careful consideration and consultation with experienced professionals who understand all aspects of piping materials and systems.

What is Nominal Pipe Size

Nominal Pipe Size (NPS) is a metric used to measure the size of a pipe for industrial applications. It is typically expressed in millimeters or inches and is based on the inside diameter of a pipe, which reflects the fluid capacity of the a specific pipe. NPS is commonly used in projects involving irrigation systems, plumbing, water supply, drainage and many other industrial uses. As pipes can fluctuate in size and material according to need, Nominal Pipe Size serves as an accurate metric to level out all types of pipe measurements and make them equivalent to one another. Knowing Nominal Pipe Size is essential for any project requiring accuracy in pipe measurements.

Pipe Schedule Chart: Pipe Size Chart

A pipe schedule chart mm is an essential tool for anyone who works with pipes in any capacity. It provides a straightforward way of providing important information about the materials used in pipes, including their size and strength capacity. The wall thickness associated with a particular schedule depends on the pipe size. This data can be crucial when determining what type of pipe should be used for a particular job. The pipe size chart makes it easy to ensure that the correct amount of material is purchased and that the project is completed according to specified safety protocols. With its handy reference capabilities, the pipe schedule chart is an invaluable resource both for professional plumbers and DIYers alike.

Pipe Schedule chart or pipe size chart is provided in the following table with respect to nominal pipe size and pipe thicknesses.

Nominal Pipe SizeOD (inches)ID (Inches)SchedulesPipe Wall Thickness (inches)Steel Pipe Weight (lb/ft)OD (mm)ID (mm)Pipe Wall Thickness (mm)Steel Pipe Weight (kg/m)
1/8″0.4050.30710, 10S0.0490.186310.2877.79781.24460.277244942
1/8″0.4050.26940, STD, 40S0.0680.244710.2876.83261.72720.364153716
1/8″0.4050.21580, XS, 80S0.0950.314510.2875.4612.4130.468027559
1/4″0.540.4110, 10S0.0650.329713.71610.4141.6510.490647651
1/4″0.540.36440, STD, 40S0.0880.424813.7169.24562.23520.632172042
1/4″0.540.30280, XS, 80S0.1190.535113.7167.67083.02260.796316524
3/8″0.6750.54510, 10S0.0650.423517.14513.8431.6510.630237429
3/8″0.6750.49340, STD, 40S0.0910.567617.14512.5222.31140.844681852
3/8″0.6750.42380, XS, 80S0.1260.738817.14510.7443.20041.099455519
1/2″0.840.67410, 10S0.0830.67121.33617.122.10820.998558004
1/2″0.840.62240, STD, 40S0.1090.85121.33615.7992.76861.266427513
1/2″0.840.54680, XS, 80S0.1471.08821.33613.8683.73381.619122367
1/2″0.840.4661600.1871.30421.33611.8364.74981.940565778
1/2″0.840.252XXS0.2941.71421.3366.40087.46762.550712993
3/4″1.050.88410, 10S0.0830.857226.6722.4542.10821.275654129
3/4″1.050.82440, STD, 40S0.1131.13126.6720.932.87021.683113416
3/4″1.050.74280, XS, 80S0.1541.47426.6718.8473.91162.193553648
3/4″1.050.6141600.2181.93726.6715.5965.53722.882573552
3/4″1.050.434XXS0.3082.44126.6711.0247.82323.632608178
1″1.3151.09710, 10S0.1091.40433.40127.8642.76862.089382172
1″1.3151.04940, STD, 40S0.1331.67933.40126.6453.37822.498627255
1″1.3150.95780, XS, 80S0.1792.17233.40124.3084.54663.232292078
1″1.3150.8151600.252.84433.40120.7016.354.232338245
1″1.3150.599XXS0.3583.65933.40115.2159.09325.445191856
1 1/4″1.661.44210, 10S0.1091.80642.16436.6272.76862.687624076
1 1/4″1.661.3840, STD, 40S0.142.27342.16435.0523.5563.382596636
1 1/4″1.661.27880, XS, 80S0.1912.99742.16432.4614.85144.460027328
1 1/4″1.661.161600.253.76542.16429.4646.355.602937234
1 1/4″1.660.896XXS0.3825.21442.16422.7589.70287.759286783
1 1/2″1.91.68210, 10S0.1092.08548.2642.7232.76863.102821815
1 1/2″1.91.6140, STD, 40S0.1452.71848.2640.8943.6834.044829589
1 1/2″1.91.580, XS, 80S0.23.63148.2638.15.085.403523266
1 1/2″1.91.3371600.2814.85948.2633.967.13747.230988584
1 1/2″1.91.1XXS0.46.40848.2627.9410.169.536154528
2″2.3752.15710, 10S0.1092.63860.32554.7882.76863.925776474
2″2.3752.06740, STD, 40S0.1543.85360.32552.5023.91165.733895661
2″2.3751.93980, XS, 80S0.2185.02260.32549.2515.53727.473559307
2″2.3751.6891600.3447.46260.32542.9018.737611.10467932
2″2.3751.503XXS0.4369.02960.32538.17611.074413.43663221
2 1/2″2.8752.63510, 10S0.123.53173.02566.9293.0485.254706872
2 1/2″2.8752.46940, STD, 40S0.2035.79373.02562.7135.15628.620933704
2 1/2″2.8752.32380, XS, 80S0.2767.65173.02559.0047.010411.3859423
2 1/2″2.8752.1251600.37510.0173.02553.9759.52514.89652104
2 1/2″2.8751.771XXS0.55213.773.02544.98314.020820.38784598
3″3.53.2610, 10S0.124.33288.982.8043.0486.446726188
3″3.53.06840, STD, 40S0.2167.57688.977.9275.486411.27433001
3″3.52.980, XS, 80S0.310.2588.973.667.6215.25368039
3″3.52.6241600.43814.3288.966.6511.125221.31050762
3″3.52.3XXS0.618.5888.958.4215.2427.65008601
3 1/2″43.7610, 10S0.124.937101.695.5043.0487.347065372
3 1/2″43.54840, STD, 40S0.2269.109101.690.1195.740413.55568533
3 1/2″43.36480, XS, 80S0.31812.51101.685.4468.077218.61693089
3 1/2″42.728XXS0.63622.85101.669.29116.154434.00454603
4″4.54.2610, 10S0.125.613114.3108.23.0488.353064195
4″4.54.02640, STD, 40S0.23710.79114.3102.266.019816.05728891
4″4.53.82680, XS, 80S0.33714.98114.397.188.559822.29269582
4″4.53.6241200.43819114.392.0511.125228.27511486
4″4.53.4381600.53122.51114.387.32513.487433.49857029
4″4.53.152XXS0.67427.54114.380.06117.119640.98403491
4 1/2″54.506STD, 40S0.24712.54127114.456.273818.66157581
4 1/2″54.29XS, 80S0.35517.61127108.979.01726.20656698
5″5.5635.29510, 10S0.1347.77141.3134.493.403611.56303381
5″5.5635.04740, STD, 40S0.25814.62141.3128.196.553221.7569568
5″5.5634.81380, XS, 80S0.37520.78141.3122.259.52530.92404667
5″5.5634.5631200.527.04141.3115.912.740.23995294
5″5.5634.3131600.62532.96141.3109.5515.87549.04988346
5″5.5634.063XXS0.7538.55141.3103.219.0557.36871989
6″6.6256.35710, 10S0.1349.29168.275161.473.403613.825043
6″6.6256.06540, STD, 40S0.2818.97168.275154.057.11228.23046994
6″6.6255.76180, XS, 80S0.43228.57168.275146.3310.972842.51684377
6″6.6255.5011200.56235.39168.275139.7314.274852.66612184
6″6.6255.1891600.71943.35168.275131.818.262664.5119068
6″6.6254.897XXS0.86453.16168.275124.3821.945679.11079505
8″8.6258.32910, 10S0.14813.4219.075211.563.759219.9413968
8″8.6258.125200.2522.36219.075206.386.3533.2753457
8″8.6258.071300.27724.7219.0752057.035836.75764932
8″8.6257.98140, STD, 40S0.32228.55219.075202.728.178842.48708049
8″8.6257.813600.40635.64219.075198.4510.312453.03816282
8″8.6257.62580, XS, 80S0.543.39219.075193.6812.764.57143336
8″8.6257.4391000.59450.95219.075188.9515.087675.82195274
8″8.6257.1891200.71961.71219.075182.618.262691.83459674
8″8.6257.0011400.81267.76219.075177.8320.6248100.8379886
8″8.6256.8131600.90674.79219.075173.0523.0124111.2997811
8″8.6256.875XXS0.87572.42219.075174.6322.225107.7728325
10″10.7510.4210, 10S0.16518.65273.05264.674.19127.75425748
10″10.7510.25200.2528.04273.05260.356.3541.72811688
10″10.7510.136300.30734.24273.05257.457.797850.95473331
10″10.7510.0240, STD, 40S0.36540.48273.05254.519.27160.24087629
10″10.759.7560, XS, 80S0.554.74273.05247.6512.781.46209408
10″10.759.564800.59464.43273.05242.9315.087695.88240265
10″10.759.3141000.71977.03273.05236.5818.2626114.6332683
10″10.759.0641200.84482.29273.05230.2321.4376122.4610106
10″10.758.75140, XXS1104.1273.05222.2525.4154.9178662
10″10.758.51601.125115.6273.05215.928.575172.0317515
12″12.7512.3910, 10S0.1824.16323.85314.714.57235.95404079
12″12.7512.25200.2533.38323.85311.156.3549.67491232
12″12.7512.09300.3343.77323.85307.098.38265.13693565
12″12.7512STD, 40S0.37549.56323.85304.89.52573.75340487
12″12.7511.938400.40653.52323.85303.2310.312479.64653407
12″12.7511.75XS, 80S0.565.42323.85298.4512.797.35568495
12″12.7511.626600.56273.15323.85295.314.2748108.8591922
12″12.7511.376800.68888.63323.85288.9517.4752131.89597
12″12.7511.0641000.844107.9323.85281.0321.4376160.5728891
12″12.7510.75120, XXS1125.5323.85273.0525.4186.7645745
12″12.7510.51401.125136.7323.85266.728.575203.4320106
12″12.7510.1261601.312150.3323.85257.233.3248223.6710402
14″1413.62410S0.18827.73355.6346.054.775241.26678606
14″1413.5100.2536.71355.6342.96.3554.63049824
14″1413.375200.31245.61355.6339.737.924867.8751573
14″1413.2530, STD, 40S0.37554.57355.6336.559.52581.20910621
14″1413.124400.43863.44355.6333.3511.125294.40912035
14″1413XS, 80S0.572.09355.6330.212.7107.2817384
14″1412.814600.59485.05355.6325.4815.0876126.5683431
14″1412.5800.75106.1355.6317.519.05157.894194
14″1412.1241000.938130.9355.6307.9523.8252194.8006597
14″1411.8141201.09150.8355.6300.0827.686224.4151222
14″1411.51401.25170.2355.6292.131.75253.2855026
14″1411.1881601.406189.1355.6284.1835.7124281.4118011
16″1615.62410S0.18831.75406.4396.854.775247.2492051
16″1615.5100.2542.05406.4393.76.3562.57729368
16″1615.375200.31252.27406.4390.537.924877.78632914
16″1615.2530, STD, 40S0.37562.58406.4387.359.52593.12929937
16″161540, XS, 80S0.582.77406.438112.7123.1753293
16″1614.688600.656107.5406.4373.0816.6624159.9776236
16″1614.314800.844136.6406.4363.5821.4376203.2831942
16″1613.9381001.031164.8406.4354.0326.1874245.2494173
16″1613.5641201.22192.4406.4344.5330.988286.3227421
16″1613.1241401.438223.6406.4333.3536.5252332.753457
16″1612.8141601.594245.3406.4325.4840.4876365.0466145
18″1817.62410S0.18835.76457.2447.654.775253.21674249
18″1817.5100.2547.99457.2444.56.3571.41698748
18″1817.375200.31258.94457.2441.337.924887.71238262
18″1817.25STD, 40S0.37570.59457.2438.159.525105.0494925
18″1817.124300.43882.15457.2434.9511.1252122.2526677
18″1817XS, 80S0.593.45457.2431.812.7139.0689202
18″1816.876400.562104.7457.2428.6514.2748155.8107645
18″1816.5600.75138.2457.2419.119.05205.6642565
18″1816.126800.938170.9457.2409.623.8252254.3272173
18″1815.6881001.156208457.2398.4829.3624309.5380995
18″1815.251201.38244.1457.2387.3535.052363.2608178
18″1814.8761401.562274.2457.2377.8539.6748408.0545523
18″1814.4381601.781308.5457.2366.7345.2374459.0985755
20″2019.56410S0.21848.05508496.935.537271.50627732
20″2019.5100.2552.73508495.36.3578.47088456
20″2019.2520, STD, 40S0.37578.6508488.959.525116.9696857
20″201930, XS, 80S0.5104.1508482.612.7154.9178662
20″2018.812400.594123.1508477.8215.0876183.192981
20″2018.376600.812155.4508466.7520.6248231.2606763
20″2017.938801.031208.9508455.6326.1874310.8774471
20″2017.4381001.281256.1508442.9332.5374381.118785
20″20171201.5296.4508431.838.1441.0917918
20″2016.51401.75341.1508419.144.45507.6127199
20″2016.0641601.969379.2508408.0350.0126564.311766
24″2423.510, 10S0.2563.41609.6596.96.3594.36447544
24″2423.2520, STD, 40S0.37596.42609.6590.559.525143.4887671
24″2423XS, 80S0.5125.5609.6584.212.7186.7645745
24″2422.876300.562140.7609.6581.0514.2748209.3846664
24″2422.626400.688171.3609.6574.717.4752254.9224829
24″2422.064600.969238.4609.6560.4324.6126354.7782833
24″2421.564801.219296.8609.6547.7330.9626441.6870574
24″2420.9381001.531357.4609.6531.8338.8874531.8697922
24″2420.3761201.812429.4609.6517.5546.0248639.0175958
24″2419.8761402.062483.1609.6504.8552.3748718.9319994
24″2419.3141602.344542.1609.6490.5859.5376806.7336719
30″3029.37610, 10S0.31298.93762746.157.9248147.2240586
30″3029.25STD, 40S0.375118.65762742.959.525176.5706515
30″302920, XS, 80S0.5157.53762736.612.7234.4304655
30″3028.75300.625196.06762730.2515.875291.7694221
36″3635.376100.312118.92914.4898.557.9248176.9724557
36″3635.25STD, 40S0.375142.68914.4895.359.525212.331231
36″3635XS, 80S0.5189.57914.488912.7282.1112381
36″3634.75300.625235.13914.4882.6515.875349.9119872
48″4847.25STD, 40S0.375190.741219.21200.29.525283.8523899
48″4847XS, 80S0.5253.651219.21193.812.7377.4727834

Abbreviations used:

  • STD – Standard,
  • XS – Extra Strong,
  • XXS – Double Extra Strong,

Pipe Schedule 40 Pipe Dimensions

Pipe Schedule 40 Pipe Dimensions are essential for a variety of plumbing projects. They provide the necessary measurements to construct pipe systems which function efficiently and safely. Pipe dimensions such as width, length, and thickness determine the overall strength of the system and its capacity to carry pressures up to 400 PSI. Pipe Schedule 40 Pipe Dimensions must be carefully selected depending on their intended purpose and specific application conditions. This is important when considering factors such as safety, cost-efficiency, durability, and performance of the installed pipe system. Every detail must be taken into consideration for proper installation, so Pipe Schedule 40 Pipe Dimensions must never be overlooked!

Pipe NPSSchedule NoOutside Diameter, InchesWall Thickness, inchesPlain End Weight, lb/ftOutside Diameter, mmWall Thickness, mmPlain End Mass, Kg/m
1/840/STD0.4050.0680.2410.31.730.37
1⁄440/STD0.5400.0880.4313.72.240.63
3⁄840/STD0.6750.0910.5717.12.310.84
1⁄240/STD0.8400.1090.8521.32.771.27
3⁄440/STD1.0500.1131.1326.72.871.69
140/STD1.3150.1331.6833.43.382.50
1-1⁄440/STD1.6600.1402.2742.23.563.39
1-1⁄240/STD1.9000.1452.7248.33.684.05
240/STD2.3750.1543.6660.33.915.44
2-1⁄240/STD2.8750.2035.8073.05.168.63
340/STD3.5000.2167.5888.95.4911.29
440/STD4.5000.23710.80114.36.0216.08
540/STD5.5630.25814.63141.36.5521.77
640/STD6.6250.28018.99168.37.1128.26
840/STD8.6250.32228.58219.18.1842.55
1040/STD10.7500.36540.52273.09.2760.29
124012.7500.40653.57323.810.3179.71
144014.0000.43863.50355.611.1394.55
164016.0000.50082.85406.412.70123.31
184018.0000.562104.7645714.27155.81
204020.0000.594123.2350815.09183.43
244024.0000.688171.4561017.48255.43
324032.0000.688230.2981317.48342.94
344034.0000.688245.0086417.48364.92
364036.0000.750282.6291419.05420.45

Conclusion:

In conclusion, understanding what pipe schedule is and why it matters is essential for any professional involved in construction, plumbing, gas lines, or another related industry that relies heavily on pipes to do their work correctly. Knowing when to choose a specific type of pipe based on thickness allows you to make informed decisions about your projects that will save time in the long run while ensuring quality results every time! With this knowledge, you can confidently move forward with any project involving pipes knowing that you have chosen exactly what best fits your needs – no matter how unique they may be!

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What is Pipe Schedule? Pipe Size chart and Pipe Schedule 40 thickness (1)

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What is Pipe Schedule? Pipe Size chart and Pipe Schedule 40 thickness (2025)

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