Friction Factor Calculator

A pipe friction factor represents wall-friction losses in fully developed internal flow. Darcy and Fanning factors use different conventions, with the Darcy value four times the Fanning value; laminar and turbulent regimes also require different relationships involving Reynolds number and relative roughness.

Friction Factor Calculator applies this concept to its defined inputs and workflow. It reports Darcy friction factor as the primary value and clearly distinguishes Fanning friction factor. Its governing relationship or workflow is stated as follows: Darcy friction factor is solved from laminar, Colebrook, Haaland, or Swamee-Jain relationships.

The calculator evaluates Geometry mode, Flow input mode, Viscosity mode, and Number format and returns Friction Factor, base-unit normalization, formula substitution, and calculation steps using the stated method. The selected units and sign or reference conventions must describe one consistent physical case. Users should interpret the output within the assumptions shown on the page and repeat the check with trusted reference values when the result affects engineering or research decisions. Colebrook, Haaland, and Swamee-Jain are pipe-flow correlations and are not universal CFD closure models.