Pipe Friction Loss Calculator

Calculate the friction loss in a straight pipe using this calculator. It uses the Darcy-Weisbach equation and solves the Colebrook equation in case of turbulent flow. The procedure is described in greater details on Pipe Friction Loss Calculation page.

Surface roughness can either be input by selecting the surface type using the selector or by setting the Internal pipe surface to Custom user input be set a user defined value.

If using water or saline water (e.g. sea water) the kinematic viscosity and density can be calculated using these calculators for water and saline water on this webpage.
The unit used for kinematic viscosity used in the calculator is mm²/s which is equal to Centistokes i.e. mm²/s=cSt.