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Pump Horsepower Calculator

Calculate the required motor power — water horsepower, brake horsepower, and motor input — for a pump from flow, head, fluid density, and efficiencies.

Interactive toolUpdated July 2026

Inputs

Flow Rate (L/s)

Total Head (m)

Fluid Density (kg/m³)

Pump Efficiency (%)

Motor Efficiency (%)

Results

Motor Input Power

2.34 kW

(3.1 hp)

Water hp

1.47 kW

Brake hp

2.10 kW

Motor input

2.34 kW

How It Works

P_water = ρ · g · Q · H

P_brake = P_water / η_pump

P_motor = P_brake / η_motor

ρ = density (kg/m³), g = 9.81 m/s², Q = flow (m³/s), H = head (m). Divide by 0.7457 for horsepower.

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