Fire Flow Calculator

Estimate the required fire flow for building fire suppression using the National Fire Academy (NFA) method.

Building Specs

Unit System

Footprint Area (sq ft)

sq ft

Total Floors

Occupancy Hazard

Required Flow

Calculating risk?

Enter building dimensions and hazard type to estimate the water flow required for suppression.

Overview

Needed Fire Flow (NFF) estimates the amount of water required to extinguish a structure after it has become fully involved. The National Fire Academy (NFA) formula is widely used by fire departments for pre-incident planning and establishing water supply requirements.

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Pro Tips

This estimate is for the structure only; extra water may be needed for 'exposure protection' of nearby buildings.
High-rise and large-scale industrial complexes require more complex hydraulic calculations beyond this basic formula.
Ensure your local water supply (hydrants, tanks) can sustain the calculated flow for the recommended duration.

Fun Facts

"The NFA formula assumes 100% involvement of the building's interior."
"Residential fires typically require between 150-500 GPM (570-1900 L/min) for effective suppression."
"Fire hydrants are color-coded by flow: Blue (>1500 GPM), Green (1000-1499), Orange (500-999), and Red (<500)."

Formula: GPM = [(Area / 3) × Floors] × Hazard Factor

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