Fire Pump Sizing Calculator

Calculate fire pump GPM, pressure, and motor HP from sprinkler demand per NFPA 20.

Sprinkler Demand (GPM)

Hose Stream Allowance (GPM)

City Static Pressure (PSI)

Required System Pressure (PSI)

Pipe Friction Loss (PSI)

Elevation (feet)

Tab to move between fields

Total Flow Demand (GPM)

750

Pump Pressure Needed (PSI)

Total Required Pressure (PSI)93

Pump Required1

Selected Pump Size (GPM)750

Brake HP Required16.3

Selected Motor (HP)20

How to Use This Calculator

Enter Sprinkler Demand (GPM), Hose Stream Allowance (GPM), and City Static Pressure (PSI).
Set Required System Pressure (PSI), Pipe Friction Loss (PSI), and Elevation (feet).
Review Total Flow Demand (GPM) and Pump Pressure Needed (PSI).
Use Total Required Pressure (PSI) and Pump Required to inform your decision.

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