Pipe Friction Loss Calculator

Darcy-Weisbach with Colebrook-White friction factor. Fluid is water at the selected temperature.

Pipe length Pipe internal diameter

Enter the actual internal bore, not the nominal size. Pipes of the same nominal size can have different internal diameters depending on material and pressure rating. If unsure, check the pipe's spec sheet or measure it directly.

Flow rate Water temperature Pipe material Pipe roughness (mm)

Filled in from the material. Type your own value to override it.

Disclaimer

This calculator is provided to assist with general pipe friction loss queries. Please work with a qualified professional to confirm the results are suitable for your specific situation.

No responsibility is accepted for any errors or omissions in this calculator, or for any misuse of its results. The results do not constitute professional engineering advice.