Fire Pump Calculator NFPA 20

ZkDev

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About this app

Fire pump sizing per NFPA 20: required flow and net pressure, brake horsepower, and the next standard pump and motor that actually exist on a cut sheet.

WHAT IT CALCULATES
- Required pump flow and net pressure from system demand
- Next standard rated capacity from 250 gpm to 5000 gpm
- Brake horsepower and the next standard motor from 7.5 HP to 500 HP
- Pump efficiency defaults by rated flow, 65 to 85 percent
- Churn, rated and 150 percent points of the pump curve
- Jockey pump sizing and driver selection, electric or diesel

CODE REFERENCES BUILT IN
- NFPA 20 Table 4.8.1 - standard fire pump rated capacities
- Standard motor horsepower sizes, so the answer matches equipment you can buy

HOW IT WORKS
Enter demand flow and pressure with suction conditions. You get the rated pump, motor horsepower, efficiency and the curve points a submittal needs.

CORE FEATURES
- Works 100 percent offline, no signal needed on site
- Calculation history you can reopen and reuse
- PDF export for submittals and field records
- Light and dark themes
- English and Spanish
- Material Design 3 interface

TYPICAL USES
- Checking a layout on site before the pipe goes up
- Verifying a contractor submittal during plan review
- Sizing during a bid walk without pulling the code book out of the truck
- Backing a field decision with a PDF you can attach to the job file
- Studying for NICET certification

WHAT THE PDF REPORT INCLUDES
- Every input you entered
- The calculated results with units
- Date and time of the calculation

OPTIONAL PRO UPGRADE - $2.99 ONE-TIME IN-APP PURCHASE
The following features require a separate one-time in-app purchase. They are not required to use the calculator:
- Unlimited saved calculation history
- PDF export of results
- Dark theme
- Ad-free experience

WHO IT IS FOR
- Fire protection engineers and system designers
- Sprinkler fitters and installers
- Fire inspectors and AHJ plan reviewers
- Contractors preparing bids and submittals
- NICET candidates and fire protection students

ACCURACY NOTE
Results are a design aid, not a stamped design. Verify against the edition of the standard adopted in your jurisdiction and confirm with the authority having jurisdiction.

Part of FireTools, the fire protection calculator collection. More tools at tradetools.dev/fire

What’s new

Added a link to TradeTools — the one-app version of this calculator and 61 more, for HVAC, electrical, plumbing, fire protection, solar and carpentry. Nothing else changed.