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Occupancy Density Calculator

Work out occupancy density instantly with clear inputs, formula shown and shareable results.

About Occupancy Density Calculator

Occupancy density is expressed either as area per person or persons per unit area, and both are needed: facilities teams work in square feet per person, while ventilation and fire codes are written as persons per square metre. Converting between them is a matter of unit arithmetic, not judgement.

Formula

Density

Area per person = floor area / occupants; persons per 100 m² = occupants x 100 / area in m²

Worked example

With the default values below, Occupancy Density Calculator returns Area per person of 75.00. Change any input above and every figure here is recalculated in your browser.

Inputs used

Number of occupantsminimum 1
120
Floor areaminimum 0.1 ft²
9,000 ft²

Results

Area per person
75.00 ft²
Area per person in metric units
6.968 m²
Persons per 100 square metres
14.35
Floor area in square metres
836.1 m²

Step by step

  1. 1Values used
  2. 2Density
  3. 3Area per person= 75.00 ft²
  4. 4Area per person in metric units= 6.968 m²
  5. 5Persons per 100 square metres= 14.35
  6. 6Floor area in square metres= 836.1 m²

Assumptions and limits

  • The result is derived only from the 2 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 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

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

Frequently Asked Questions

How is the Occupancy Density figure worked out?

Area per person = floor area / occupants; persons per 100 m² = occupants x 100 / area in m². Occupancy density is expressed either as area per person or persons per unit area, and both are needed: facilities teams work in square feet per person, while ventilation and fire codes are written as persons per square metre.

Why does density matter beyond comfort?

It drives ventilation rate, cooling load, toilet provision, lift capacity and escape width. Increasing density without revisiting those systems is how a refurbishment ends up non-compliant.

What values do I need to enter?

This calculator takes 2 inputs: Number of occupants, Floor area. The pre-filled defaults are a realistic worked example — replace them with your own site or project figures.

Related Calculators

Occupancy Density Calculator – Calculate Area per person