Fire Protection System Calculator

Select fire protection system type to design
Applicable standard for fire cabinet/hydrant system
Fire cabinet system installation type
Standard fire hose length
Inner diameter of fire hose
Nozzle type affects K-factor and pattern
Vertical riser height from pump to highest outlet
Number of hoses operating simultaneously
For labeling only — all hydrant values below are entered manually, not looked up from a table
Leave 0 if there are no exterior/yard hydrants on this pump. Verify the required simultaneous count against your code.
Design flow per hydrant outlet — verify against your applicable standard (typical range varies widely by code and hazard)
Minimum pressure required at the hydrant outlet while flowing — verify against your applicable standard
Pipe run length from pump to the farthest hydrant on the yard main, for friction loss
Maximum distance between adjacent hydrants around the site/building perimeter — informational, for the report; verify against your applicable code
Applicable code family — each hazard area below is looked up against this standard
Total floor area protected as Light Hazard. Leave 0 if not present in this project.
Vertical distance from pump to this area's highest sprinkler
Total floor area protected as Ordinary Hazard. Leave 0 if not present in this project.
Vertical distance from pump to this area's highest sprinkler
Total floor area protected as Extra Hazard. Leave 0 if not present in this project.
Vertical distance from pump to this area's highest sprinkler
Sprinkler head type and orientation
Sprinkler pipe material for friction calculation
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Fire Protection System Calculator

Complete fire protection system design calculator. FIRE CABINET & HYDRANT MODE: • NFPA 14, EN 671-1/2, TS 9251/12183 compliance • Hose friction loss and riser sizing • Pump pressure requirement • Manifold/header sizing AUTOMATIC SPRINKLER MODE: • NFPA 13, EN 12845, TS 9252 compliance • Sprinkler count and placement • Pipe sizing (main and branch) • Hydraulic calculations • Tank volume (NFPA 22 / EN 12845) • Pump selection PUMP SELECTION: • Electric centrifugal (standard) • Multi-stage (high pressure) • Diesel-driven (emergency backup) STANDARDS SUPPORTED: • NFPA 13, 14, 20, 22 • EN 12845, 671-1/2 • TS 9251, 9252, 9253, 12183 DESIGN DENSITIES: Light Hazard: 2.25-4.1 mm/min Ordinary Hazard: 5.0-6.1 mm/min Extra Hazard: 10.0-24.4 mm/min COVERAGE AREAS: Light: 12-20 m² per sprinkler Ordinary: 9-12 m² per sprinkler Extra: 6-9 m² per sprinkler

Key Points:
  • Dual mode: Fire Cabinet or Sprinkler system
  • Multi-standard compliance (NFPA, EN, TS)
  • Automatic sprinkler count calculation
  • Pipe sizing with hydraulic analysis
  • Pump selection with safety margins
  • Tank volume per standard requirements
  • Standard comparison table
  • Compliance status indicator
  • Fire protection design report
  • Material list generation
Calculation Steps:
  1. Enter all required parameters
  2. Click "Update Calculation"
  3. Review results and analysis
Formula Variables:
Q Flow Rate (L/min)
P Pressure (bar)
K K-Factor (L/min·bar^0.5)
D Density (mm/min)
A Coverage Area (m²)
n Sprinkler Count (-)
Dpipe Pipe Diameter (mm)
V Velocity (m/s)
ΔP Pressure Loss (bar)
Vtank Tank Volume (m³)