Site coverage calculator

Ground coverage percentage and open space of a plot.

  • Free, no sign-up
  • Runs in your browser
How it is calculated

Site coverage = building footprint ÷ plot area × 100. Maximum footprint = plot area × permitted coverage. Open area = plot area − footprint.

Check locally: Permitted coverage and what counts as footprint depend on local rules.

Questions

What is ground coverage?

The share of the plot covered by the building footprint, as a percentage.

Is anything I enter saved or sent?

No. The calculation runs in your browser. Nothing you type is sent anywhere. You can copy the result, print it or download it as a CSV.