Centrifugal Pump Power Calculator

Water horsepower divided by pump efficiency.

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Formula

BHP = GPM × head × SG ÷ (3960 × η)

Example calculation

10 GPM, 20 ft, 40% → 0.126 bhp.

Practical HVAC use

Motor sizing and energy estimates.

Common mistakes

Forgetting motor efficiency in electrical input.

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Educational tool. Results are estimates from the stated formulas; always confirm with manufacturer data and the code adopted in your jurisdiction. All calculators