fire

Evacuation Time (RSET) Calculator

Calculate RSET per NFPA 101 / BS 9999: pre-movement + travel time + flow time through exits. Required for fire risk assessments.

Occupants

Travel distance (m)

Total exit width (m)

Pre-movement time (s)

Result

{
  "preMovementS": 60,
  "travelS": 25,
  "flowS": 64,
  "rsetS": 149,
  "rsetMinutes": 2.5,
  "regulation": "NFPA 101 / BS 9999 / SFPE Handbook"
}

Formula

RSET = pre-movement + travel + flow

Regulation

NFPA 101 / BS 9999 / SFPE Handbook

Embed this calculator

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="evacuation-time-calculator"></script>

Optional attributes: data-theme, data-width, data-min-height. Works on any CMS (WordPress, Webflow, Ghost, plain HTML).

Need more than a calculator?

SmartQHSE is the AI-powered HSE / QHSE management platform built on top of these formulas — permits-to-work, AI-generated risk assessments, incident management, contractor prequalification, and ISO 45001 compliance dashboards.

Start free on smartqhse.com →

GitHub·npm·HSE blog·HSE glossary·Regulations index