Flow and Headloss Calculator

A free online calculator for determining headloss in plastic pipe systems*

This is a basic pipe headloss calculator which enables you to determine the pressure (head) required at one end of a pipe to get the required flow at the other end. It only works for single pipe runs and will not work for networks and uses the "Hazen Williams" calculation.

*This calculator is provided for free use by Plastic Pipe Shop Ltd. The results given by this application should be used as a guideline only. By ticking "accept" you confirm that you have read and accepted our Terms and Conditions of use(if you don't tick it the calculator will not work!)

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System units
Metric Inch
Plastic type
Flow units
Pipe size (as selected in the "System Units" above)
Pipe length (m)
Flow rate (In the "Flow units" selected above)
90 Elbows
45 Elbows
90 Bends
45 Bends
Thru tee
Branch tee
Ball valve
Butterfly valve
Diaphragm valve
Check / NRV valve

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