Friction Factor Calculator

Calculate Darcy-Weisbach friction factor for pipe flow. Determine friction losses in fluid systems.

Input Parameters

Reynolds Number

Relative Roughness (ε/D)

Results

Enter values and click Calculate

About Friction Factor Calculator

The Darcy-Weisbach friction factor (f) depends on Reynolds number and relative roughness. For laminar flow (Re < 2300), f = 64/Re. For turbulent flow, it is calculated using the Colebrook equation.