Water Pump Horsepower Calculator
Estimate pump horsepower from flow, total dynamic head and efficiency.
Estimated result
—
How this calculator works
Estimate pump horsepower from flow, total dynamic head and efficiency.
Horsepower = GPM × head ÷ (3960 × efficiency)
Planning note
Results are estimates. Confirm local plumbing codes, product specifications and licensed-professional requirements before construction or safety-critical work.