Crowd Size Calculator (People per Square Metre)
How many people fit in, or were at, a square, hall or field from its area and how packed the crowd is.
Results
People who fit
2000
Space per person
0.50
m²
At 1 person per m²
1000
At 2 people per m²
2000
At 4 people per m²
4000
What this tool does
Counting a crowd works the same way in both directions: multiply the area the people actually occupy by a density. This is the method Herbert Jacobs popularised in the 1960s for estimating rally sizes, and it is why organisers' and police figures differ — they disagree about the area and the density, not the arithmetic. Leave out stages, bars, barriers and empty corners. Densities of 4 people per m² and above are where crowd-safety guidance warns of real danger in moving crowds, and any event that might approach them needs professional planning, not a calculator.
Formula
people = area × density (people per m²)
Variables
| Symbol | Meaning | Unit |
|---|---|---|
ar | Area available to the crowd | m² |
dn | How packed | — |
P | People who fit | — |
AP | Space per person | m² |
P1 | At 1 person per m² | — |
P2 | At 2 people per m² | — |
P4 | At 4 people per m² | — |
Worked example
- Area available to the crowd1000 m²
- How packed2
- People who fit2000
- Space per person0.50 m²
- At 1 person per m²1000
- At 2 people per m²2000
- At 4 people per m²4000
Limitations
- The result is an estimate based only on the values you type. Real situations often include factors this calculator does not know about.
- For work that must comply with a standard or be signed off, check the result against the applicable code and have it reviewed by a qualified engineer.