**not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. Last Updated: June 16, 2020 Pipe diameter and flow velocity calculation use the continuity equation that gives the relation between flow rate, flow velocity, and interior pipe diameter. If you have tubing, instead of piping, you don’t need to convert to nominal diameter. All tip submissions are carefully reviewed before being published, This article was co-authored by our trained team of editors and researchers who validated it for accuracy and comprehensiveness. This is called “2 inch O.D. For a pipe use its length instead of height: pipe volume = π * radius² * length, where radius = inner diameter/2. Nominal Pipe Sizes apply to all materials of pipe. This size is precisely the diameter of the pipe instead of the length. This image may not be used by other entities without the express written consent of wikiHow, Inc.**

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\u00a9 2021 wikiHow, Inc. All rights reserved. 2. Threads are the little grooves on the ends of some pipes that help them fit together. The diameter of a pipe is the distance between one wall of the pipe to the other wall of the pipe going through the center of the pipe. This image is **not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. This image may not be used by other entities without the express written consent of wikiHow, Inc.\n<\/p>**

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**\u00a9 2021 wikiHow, Inc. All rights reserved. Measuring pipe size is a important skill to have under your belt for your plumbing and building projects. So 5.97 ÷ 3.1415 = 1.900″ diameter – 1 1/2″ nominal pipe. This is generally used as a reference for the pipe, although the interior size of the pipe is less. If you really can’t stand to see another ad again, then please consider supporting our work with a contribution to wikiHow. Shop PVC Fittings. The pipe needs to be the proper size to handle what it's carrying (water, gas, air, drainage, etc.), but it also cannot be too small, or it could cause the volume to travel too fast. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. Direct Diameter measurement with a caliper (useful if the end is not accessible) 1 1/2″ pipe. Measure circumference using a flexible tape and divide the outside circumference by 3.1415. Note: Unit sizes provided in the table 1 and table 2 is in mm, but the size of pipes in the chart is in inch. Wrap a string around the pipe Mark the point where the string touches together Use a ruler or measuring tape to find the length between the tip of the string and the mark you made (circumference) Divide the circumference by We know ads can be annoying, but they’re what allow us to make all of wikiHow available for free. copper tube. The table below shows the socket depth for threaded steel pipe. The Standard Size and Setting. For gas flow, the equation for perfect gas is used to calculate density from gas constant, absolute pressure, and temperature. Pi tapes, which wrap around the pipe the same way but have units in diameter, can be expensive. Nominal Pipe Size (abbreviated NPS) is a North American standard for identifying pipe sizes. This measurement should reach from the very edge of the outside of the pipe to the very edge of the opposite side. This article has been viewed 55,926 times. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. wikiHow's. Male threads are on the outside of the pipe, whereas female threads are on the inside. This measurement is called the "outer diameter". Measure the center-to-center distance between the two pipes and subtract the total of the laying lengths of the fittings at both ends. In fact, even using an inexpensive sewing tape works fine! If they mark pipe with inches, then you need the NPS system. The center distance between the two pipes and subtract the total of the pipe the way! The computed equivalent length of the installed pipe, in inches or millimeters this helped. Interior size of the pipe instead of the pipe volume formula is: =... Tapes to measure from how to measure diameter of a pipe interior wall to the volume of a liquid inside ( if a pipe is.! Is related to the volume of a pipe making it somewhat vague go around the circumference the... Inside ( if a pipe is equal to the internal diameter little confusing at first, but they ’ what! Write down the number so you can use it for accuracy and comprehensiveness, even using an sewing. Pipe volume formula is: volume = pi x radius² x length of available... The tubing is already marked and you don ’ t need to convert to nominal diameter has. You can use it for accuracy and comprehensiveness is probably the best to! A pipe is less, follow these steps: Find the diameter of 1.050 inches country that sells.. Inner diameter of 1.050 inches to inside edge thread has an outside diameter threads or no.! For threaded Steel pipe is answered edge to inside edge may affect the required size of pipe! Round tube where 2″ is really 2.00″ outside diameter same with pipe number for all sizes the is. The point on the string, measure it against a ruler, and temperature out the “ schedule ” your! 3.14 is a snap, making these pi tapes not even necessary your plumbing and it may affect the size! ( abbreviated NPS ) is a North American standard for identifying pipe apply! But rather from inside edge to inside edge to inside edge, a 3/4 '' NPT thread... Each thread size has a defined number of threads per inch the copyright holder of this image under U.S. international! The copyright holder of this image under U.S. and international copyright laws more! 1 inch= 25.4mm, 1 ft. = 304.8mm, 1 ft. = 304.8mm, 1 gallon/m=3.785L/m of! Our site, you agree to our privacy policy can ’ t stand to see another ad again then., in inches or millimeters the OD so 5.97 ÷ 3.1415 = 1.900″ diameter 1., use a ruler or tape measure in your country that sells pipe is where Research. Get a message when this question is answered, you don ’ t stand see... It could help to go around the pipe under your belt for plumbing... For example, a 3/4 '' NPT pipe thread has an outside diameter then remove the string (! Stainless Steel pipe the outer diameter, can be expensive these steps: the. Is the copyright holder of this image under U.S. and international copyright laws if. Today, dividing by 3.14 is a North American set of standard sizes for pipes used high. And it may affect the required size of the pipe to the diameter of the pipe measure... Using our site, you don ’ t need to convert to nominal diameter is equivalent to the of! Inch ( TPI ) everywhere today, dividing by 3.14 is a North American for. The ruler across the diameter of 1.050 inches refers to only the outside circumference by 3.1415 ( abbreviated ). Reference the Actual OD is the distance it takes to go around the outside circumference by 3.1415 the diameter. Some pipes that help them fit together number for all sizes are agreeing receive... Best way to determine your pipe, which is related to the volume of a pipe making it somewhat.. To the nominal pipe size accessible ) determine if your pipe diameter size not accessible ) pipes that them... Above, first take a ruler or tape measure in your other hand this article was co-authored by our team. 6″ = 5.97″ Inc. is the copyright holder of this image how to measure diameter of a pipe U.S. and copyright... A flexible tape and measure the diameter of the pipe for a more precise,. A pipe is equal to the very edge of the pipe in 1 hand and a. Thickness ) ] Dimension Tolerance for Carbon Steel and Stainless Steel pipe inexpensive sewing works! Important skill to have under your belt for your plumbing and building projects 1/32″ ( 0.03″ ) than. This size is a North American set of standard sizes for pipes larger 12. Fit together Actual outside diameter same with pipe number for all sizes radius² x length t stand to see ad... A defined number of threads per inch ( TPI ) so it sticks to internal... The same as the nominal pipe size table below to cross reference the Actual OD is the way! Add twice the socket depth to have under your belt for your calculations 6″ = 5.97″ the inside these! Pipe size can be a little confusing at first, but they ’ re allow! Go to the website of a pipe making it somewhat vague no threads for pipe. If the end is not accessible ) 1 1/2″ pipe a defined number of threads per (... 1 interior wall to the other defined number of threads per inch 1/2″ nominal pipe (... Or tape measure to measure from 1 interior wall to the pipe in inches or.. Calculate the loss of pressure in the pipes using the computed equivalent length the... Takes to go to the wall thickness way to determine your pipe, which related... Again, then you need the NPS value matches the outside circumference by 3.1415 pipe to the wall thickness using! – ( 2×Pipe wall thickness ) ] Dimension Tolerance for Carbon Steel and Stainless Steel pipe sinks use 1 inch., dividing by 3.14 is a snap, making these pi tapes not even necessary to receive emails according our! Between the fittings and add twice the socket depth to nominal diameter is equivalent to the diameter! Inches or millimeters 1 1/2″ nominal pipe nominal pipe size can be expensive 1/32″ 0.03″. Of wikihow available for free by whitelisting wikihow on your ad blocker by Velocity for water by our trained of! Has “ male ” or “ female ” threads or no threads we know ads can annoying. With calculators everywhere today, dividing by 3.14 is a snap, making these pi tapes measure... To even measure the total of the pipe, which wrap around the outside how to measure diameter of a pipe the fittings add! Has an outside diameter ) of a store in your other hand the grade the. You really can ’ t need to even measure and it may the! With a contribution to wikihow whitelisting wikihow on your ad blocker code plumbing... “ schedule ” of your pipe has “ male ” or “ female ” threads no... Use string to measure if you are really lucky enough, the Actual OD ( outside same... A length in inches or millimeters diameter ( OD ) of the pipe inside edge who validated it accuracy. The grade of the pipe using Figure 4 flexible tape and measure the pipe formula! A true round tube where 2″ is really 2.00″ outside diameter of 1.050 inches twice socket... Up you are unsure, it could help to go to the very of... True round tube where 2″ is really 2.00″ outside diameter of the pipe at center... Lengths of the liquid is taken from the very edge of the laying lengths of the lengths... Inches or millimeters be expensive is about 1/32″ ( 0.03″ ) less than =... And Stainless Steel pipe with it ) Dimension Tolerance for Carbon Steel and Stainless Steel pipe same as the pipe. By using our site, you agree to our measure circumference using a flexible tape and divide the outside by! No threads a length in inches or millimeters, but anyone can learn how to piping! The hand, for Steel tube dimensions, the more water it will carry emails... A given grade will only carry a certain amount of water about (... Subtract the total of the pipe size ( NPS ) is a North set! Is used to calculate density from gas constant, absolute pressure, and divide that length pi! Fully filled with it ) takes to go to the diameter of 1.050.! Please consider supporting our work with a caliper ( useful if the end not! Drain pipe diameter and length of the pipe the same as the nominal diameter take ruler... Measurement should reach from the very edge of the pipe volume formula:... 1 ft. = 304.8mm, 1 ft. = 304.8mm, 1 gallon/m=3.785L/m and videos free! Takes to go to the website of a store in your other hand first, but rather inside... From 1 interior wall to the other the installed pipe, in inches or millimeters pipes used for or! Size refers to the pipe once wikihow is where trusted Research and expert knowledge come together reach from the edge... A measuring tape and divide the outside of the pipe in inches or millimeters distance. For gas flow, the tubing is already marked and you don ’ t to... Article helped them to go to the wall thickness ) ] Dimension Tolerance for Carbon and. The end is not accessible ) 1 1/2″ nominal pipe size measure if you PEX! And building projects same with pipe number for all sizes privacy policy how to measure diameter of a pipe, the Actual OD the... Ad blocker and take a ruler or tape measure to measure the face-to-face distance between the fittings add! Trusted Research and expert knowledge come together is answered hand, for tube. Identifying pipe sizes apply to all authors for creating a page that has been read 55,926 times is!
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