FAR / GFA Calculator

Floor-area ratio, allowable GFA and coverage in seconds. Enter your site area and zoning limits to get the allowable gross floor area, maximum building footprint and minimum floor count — then check a planned scheme against them. Instant, free, in your browser.

Site & zoning limits

Site area (m²)

Permitted FAR

Max site coverage (%)

Tip: FAR (floor-area ratio, a.k.a. FSI / plot ratio) and coverage caps come from your zoning ordinance or development plan — both are editable here, so use your local values.

Planned scheme (optional)

Planned GFA (m²)

Planned footprint (m²)

Leave at 0 to skip. Enter your scheme's gross floor area to see achieved FAR and remaining GFA headroom, and its footprint to check achieved coverage against the cap.