Friction Coefficient Calculator

This calculator determines the Friction Coefficient for laminar and turbulent flow as function of Reynolds Number, pipe roughness and hydrauliv diameter. It is an alternative of using the Moody chart or numerically solving the Colebrook equation. The calculator uses fD=64/Re for the laminar region i.e. Reynolds Number<2300 and the Colebrook equation for turbulent flow. If the roughness is set to 0 i.e. smooth pipes Blasius equation is used in the turbulent flow regime.

The friction coefficient calculated can be used in conjuction with the Darcy-Weisbach Equation to calculate pressure drop in a straight pipe.
See more here for further details on the procedure on how to calculate pressure drop in straight pipes and description of the Friction Coefficient and how to calculate it.

Input is in millimeter [mm] for both the hydraulic diameter D_h and for roughness. Other input units can however be used as long as the units for the two is identical.