NFPA in USA

NFPA 13 calculator

Fire Pump Sizing Calculator

Estimate required pump flow and discharge pressure from sprinkler demand, hose allowance, and elevation.

Sprinkler SystemsNFPA 13Workpaper

Calculation workpaper

Enter inputs, review outputs, then use the guidance below before carrying the result forward.

US customary units

Calculation inputs

Enter project screening values in the units shown.

Ready

Worksheet header

Optional project fields for keeping the calculation screen traceable.

Results

Ready

Sprinkler demand

500 GPM

Calculated output

Hose allowance

250 GPM

Calculated output

Rated flow screen

750 GPM

Calculated output

Sprinkler demand500GPM
Hose allowance250GPM
Rated flow screen750GPM
Discharge pressure screen98.66psi
Elevation pressure8.66psi

NFPA in USA calculation workpaper

Fire Pump Sizing Calculator

NFPA 13 ยท Sprinkler Systems

nfpainusa.comGenerated record

Project record

Project ID
Not entered
Area
Not entered
System
Not entered
Revision
Not entered
Prepared by
Not entered
Checked by
Not entered

Inputs

Sprinkler demand
500 GPM
Hose allowance
250 GPM
Required system pressure
90 psi
Elevation above supply
20 ft

Results

Sprinkler demand
500 GPM
Hose allowance
250 GPM
Rated flow screen
750 GPM
Discharge pressure screen
98.66 psi
Elevation pressure
8.66 psi

Calculation basis

Formula
Pump demand = sprinkler demand + hose allowance
Reference standard
NFPA 13
Professional boundary
Verify adopted code, project criteria, listed equipment data, and AHJ requirements before relying on this record.
NFPA in USAnfpainusa.comThis is a calculation record, not a signed or sealed engineering document.

Calculation basis

Use the formula and linked reference data after the result is visible. Keep input selection separate from the calculation screen.

Formula

Pump demand = sprinkler demand + hose allowance

Nominal Pipe Diameter

Nominal SizeSchedule 10 ID (in)Schedule 40 ID (in)
3/4"0.8840.824
1"1.0971.049
1-1/4"1.4421.38
1-1/2"1.6821.61
2"2.1572.067
2-1/2"2.6352.469

Density and Area Baseline

Hazard ClassificationDensity (GPM/sq ft)Design Area (sq ft)
Light Hazard0.101500
Ordinary Hazard Group 10.151500
Ordinary Hazard Group 20.201500
Extra Hazard Group 10.302500
Extra Hazard Group 20.402500

Use this result

Use rated flow and discharge pressure screen before pump selection review.

Check before use
Confirm sprinkler demand, hose allowance, elevation, and required system pressure.
Common pitfall
Do not treat screened flow and pressure as a manufacturer pump curve selection.
Next step
Fire Pump Horsepower Calculator

Input evidence

Confirm these values before using the result.

  • Sprinkler demand (GPM)
  • Hose allowance (GPM)
  • Required system pressure (psi)
  • Elevation above supply (ft)

Authority basis

Check jurisdiction, AHJ, submittal, and edition records before using this result as project evidence.

State and Local Code Adoption WorkflowAHJ Contact ChecklistFire Protection Submittal ChecklistNFPA 13, 72, and 25 Edition Basis Worksheet

Record retention

Save the PDF after project fields, inputs, and results are set.

PDF includes

  • Project header and calculator inputs
  • Computed result rows and warnings
  • Formula, reference basis, and professional boundary

Check before filing

  • Input traceability
  • Method review
  • Output reasonableness
  • Professional boundary

Open next

NFPA 13 Hydraulic Design WorksheetSprinkler Pipe Internal Diameter ReferenceNFPA 13 Sprinkler System Calculators
Engineering disclaimer
NFPA in USA provides engineering workpapers, calculation checks, and reference tables for project screening and coordination. Final design decisions, code interpretations, submittals, and acceptance records must be completed by qualified professionals and verified against the adopted code, project criteria, listings, and Authority Having Jurisdiction requirements. This site does not issue signed or sealed engineering documents.

Related tools and tables

Hazen-Williams Friction Loss CalculatorSprinkler K-Factor Flow and Pressure CalculatorNFPA 13 tool hubSprinkler Pipe Internal Diameter ReferenceNFPA 13 Design Density and Area Reference

FAQ

What is this Fire Pump Sizing calculator for?+
Use it to compute a defined fire protection value from documented inputs, then retain the inputs, result, formula, and warnings with the project record.
Are the results suitable for permit submission?+
Use the saved record only after it is checked against adopted code, project criteria, equipment listings, and AHJ requirements.