Fire Pump Sizing Calculator
The Fire Pump Sizing Calculator picks the rated flow and pressure for a fire-protection duty per NFPA 20 pump-selection rules. Example: for a 500 GPM / 100 psi fire-protection demand, Recommended flow = 2840 L/min, Rated pressure = 7.58 bar, Motor = 55.74 kW (per NFPA 20:2022 | NFPA 13:2022 | NFPA 25 | BFP IRR RA 9514).
How it works
Computed from your inputs per NFPA 20:2022 | NFPA 13:2022 | NFPA 25 | BFP IRR RA 9514.
Worked example (Fire Protection)
Inputs: a 500 GPM / 100 psi fire-protection demand.
| Result | Value |
|---|---|
| Recommended flow | 2840 L/min |
| Rated pressure | 7.58 bar |
| Motor | 55.74 kW |
Computed live by WorkHive's calculation engine; standard: NFPA 20:2022 | NFPA 13:2022 | NFPA 25 | BFP IRR RA 9514.
How to use this calculator
- Enter the figures for the duty you are sizing: the worked example below uses a 500 GPM / 100 psi fire-protection demand.
- The calculator returns Recommended flow, Rated pressure, Motor, computed per NFPA 20:2022.
- Check the worked example to confirm the method matches how you would do it by hand, then run your own numbers in the interactive tool.
FAQ
What is a fire pump sizing calculator NFPA 20?
The Fire Pump Sizing Calculator is a free online tool that computes picks the rated flow and pressure for a fire-protection duty per NFPA 20 pump-selection rules. It shows the formula and a fully worked example so you can check the method, not just the number.
How is it calculated?
The result is computed from your inputs following NFPA 20:2022. The worked example on this page shows a real computation with real numbers.
Is the calculator free?
Yes. WorkHive's engineering calculators are free to use, no sign-up needed for the tools. WorkHive is a free, offline-first maintenance platform built for Philippine industrial plants.
Run it on your own numbers
Open the interactive Fire Pump Sizing Calculator in WorkHive: free, no sign-up needed for the calculators.