Pump Head Loss Calculator for Plumbing
Pump head loss in a plumbing run is the pipe pressure drop converted into equivalent fluid head. Use it before selecting a pump curve or checking NPSH.
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Head from pressure drop
head_loss = dp / (rho * g)
Friction plus fittings
dp = (f * L / D + sumK) * rho * v^2 / 2
Pump-selection caution
Head loss is only the system-piping portion. Elevation, valves, strainers, heat exchangers, control points and pump curves still govern final selection.
Related pages
- Pipe pressure drop calculator - Darcy-Weisbach loss, head and velocity from flow and pipe ID.
- Pipe size by flow velocity - pick a first-pass pipe ID from flow and target velocity.
- Pump flow and HP calculator - pump displacement, pressure, flow, kW and horsepower.
- Pump NPSH calculator - available suction head and NPSH margin.