Calculate the internal volume of a pipe in litres and gallons from its diameter and length, for plumbing and heating systems.
The volume of water a pipe holds depends on the internal bore, which can be noticeably smaller than the quoted size once you allow for the wall thickness. For accurate results use the actual internal diameter.
Knowing pipe volume helps you size expansion vessels, work out how much water a system holds for dosing inhibitor, estimate flushing volumes and calculate how long it takes to drain or fill a run of pipe.
Use the formula volume equals pi times the radius squared times the length, with the internal radius. This calculator does it and converts to litres and gallons.
Always use the internal (bore) diameter. The external size includes the pipe wall, which does not hold water.
About 0.18 litres per metre for 15mm internal bore. Larger pipes hold much more, for example 22mm holds around 0.38 litres per metre.
It is useful for sizing expansion vessels, dosing system inhibitor, estimating flushing water and working out fill and drain times.
Only through the internal bore. Copper, plastic and steel pipes of the same nominal size can have slightly different internal diameters, so check the actual bore.
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