# Free Online Hazen-Williams Pipe Head Loss Calculator

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## Hazen-Williams Pipe Head Loss at Given Diameter, Roughness, and Flow

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Inputs
 Flow, Q m^3/s l/s Ml/d cfs gpm MGD X Pipe diameter, d0 m mm ft in X Pipe length, L m mm ft in X Hazen-Williams coefficient, C X Total combined junction loss coefficient, k X Elevation 1 m mm ft in X Pressure head 1 m H2O mm H2O kPa ft H2O in H2O psi X Elevation 2 m mm ft in X
Results
 Flow area Flow area m^2 mm^2 ft^2 sq. in. X Wetted perimeter Wetted perimeter m mm ft in X Hydraulic radius Hydraulic radius m mm ft in X Velocity, v Velocity, v m/s ft/sec X Velocity head, hv Velocity head, hv m H2O mm H2O kPa ft H2O in H2O psi X Friction slope Friction slope rise/run % rise/run X Shear stress (tractive force), tau Shear stress (tractive force), tau N/m^2 psf X Friction loss, Hf Friction loss, Hf m H2O mm H2O kPa ft H2O in H2O psi X Junction loss, Hm Junction loss, Hm m H2O mm H2O kPa ft H2O in H2O psi X Total loss, Hl Total loss, Hl m H2O mm H2O kPa ft H2O in H2O psi X HGL 1 HGL 1 m H2O mm H2O kPa ft H2O in H2O psi X HGL 2 HGL 2 m H2O mm H2O kPa ft H2O in H2O psi X Pressure head 2 Pressure head 2 m H2O mm H2O kPa ft H2O in H2O psi X