Free Online Darcy-Weisbach Pipe Head Loss Calculator

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Darcy-Weisbach Pipe Head Loss at Given Diameter, Roughness, and Flow

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Inputs

Flow, Q (See notes)		X
Pipe diameter, d₀		X
Pipe length, L		X
Darcy-Weisbach absolute roughness, e		X
Kinematic viscosity, v, in m²/sec (1E-6 for clean water at room temperature)		X
Total combined junction loss coefficient, k		X
Downstream EGL		X

Results

Flow area	Flow area		X
Wetted perimeter	Wetted perimeter		X
Hydraulic radius	Hydraulic radius		X
Velocity, v	Velocity, v		X
Velocity head, h_v	Velocity head, h_v		X
Reynolds number, Re	Reynolds number, Re		X
Flow regime	Flow regime		X
Friction factor method	Friction factor method		X
Friction factor, f	Friction factor, f		X
Friction slope	Friction slope		X
Average shear stress (tractive force), tau	Average shear stress (tractive force), tau		X
Friction loss, H_f	Friction loss, H_f		X
Junction loss, H_m	Junction loss, H_m		X
Total loss, H_l	Total loss, H_l		X
Downstream HGL	Downstream HGL		X
Upstream EGL	Upstream EGL		X
Upstream HGL	Upstream HGL		X

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