Fire Flow Calculator

Estimate required fire flow for a building.

Required fire flow (GPM) 1,000

Formula: NFA: GPM = total floor area ÷ 3

Step-by-step with your numbers:

1. Values used:

2. Total floor area = 3,000

4. Required fire flow = 1,000GPM

Did we solve your problem today?

Estimate the fire flow a building may require, using the National Fire Academy formula.

The math behind it

NFA formula: needed fire flow (GPM) = total floor area (ft²) ÷ 3, for a fully involved structure.

3,000 ft² → ~1,000 GPM.

Official sizing?

Real fire-flow requirements follow ISO/IFC tables and local codes — this is a field estimate.