fire · Free · Open Source · MIT

Fire Load Calculator

Fire load density (MJ/m²). Based on NFPA 557 / BS 9999 / EN 1991-1-2. Results shown with the full formula so you can verify. Zero signup, zero tracking, zero data sent to a server — all calculation is client-side.

Inputs
Fire load density · LOW
109 MJ/m²
Raw JSON result
{
  "fireLoadMJPerM2": 109,
  "classification": "low",
  "regulation": "NFPA 557 / BS 9999 / EN 1991-1-2"
}
Overview

About the Fire Load Calculator

Fire load density (MJ/m²) under NFPA 557 / BS 9999 / Eurocode EN 1991-1-2. Required in fire risk assessments and fire engineering calculations for building egress design.

Formula
FL = Σ (Mass × Calorific Value) / Floor Area
Regulation

NFPA 557 / BS 9999 / EN 1991-1-2

How to use

Step-by-step: using the Fire Load Calculator

  1. 1
    Enter combustible mass per material + floor area.
Who uses this calculator

Used by safety professionals worldwide

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Free for any website, blog, or course — MIT / CC BY 4.0. Attribution stays visible.

<script src="https://tools.smartqhse.com/embed.js" data-calc="fire-load-calculator"></script>
Optional attributes: data-theme, data-width, data-min-height. Works on any CMS (WordPress, Webflow, Ghost, plain HTML).
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