Assembly Point Area Calculator

Work out assembly point area instantly with clear inputs, formula shown and shareable results.

About Assembly Point Area Calculator

An assembly point must hold everyone comfortably enough for a roll call, which needs about 0.5 square metres per person standing. A margin is added for visitors, contractors and delivery drivers who are rarely on the headcount but always present in an evacuation.

Formula

Assembly area

Area = occupants x area per person x (1 + margin)

Worked example

With the default values below, Assembly Point Area Calculator returns Assembly area required of 240.0. Change any input above and every figure here is recalculated in your browser.

Inputs used

People assemblingminimum 1: 400
Area per personminimum 0.1 m²: 0.5 m²
Margin for visitors and contractorsaccepts 0–100 %: 20 %

Results

Assembly area required: 240.0 m²
Area for the stated headcount: 200.0 m²
Density at the assembly point: 200.0 people per 100 m²
Diameter if the area were circular: 17.5 m

Step by step

1Values used
2Assembly area
3Assembly area required= 240.0 m²
4Area for the stated headcount= 200.0 m²
5Density at the assembly point= 200.0 people per 100 m²
6Diameter if the area were circular= 17.5 m

Assumptions and limits

The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 1 decimal place, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
Preliminary estimate only. Assembly point location and capacity must be established in the site emergency plan by a competent person.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Preliminary estimate only. Assembly point location and capacity must be established in the site emergency plan by a competent person.

Frequently Asked Questions

How is the Assembly Point Area figure worked out?

Area = occupants x area per person x (1 + margin). An assembly point must hold everyone comfortably enough for a roll call, which needs about 0.5 square metres per person standing.

What else matters besides area?

Distance from the building, at least the building height away and clear of falling glass; not blocking fire service access; and being reachable without crossing a road where possible.

What values do I need to enter?

This calculator takes 3 inputs: People assembling, Area per person, Margin for visitors and contractors. The pre-filled defaults are a realistic worked example — replace them with your own site or project figures.