Floor Area Ratio (FAR) Calculator
FAR, building coverage, and remaining buildable area under zoning limits.
How it works
FAR = total floor area of all floors ÷ lot area. Building coverage = footprint ÷ lot area × 100. Remaining buildable area = lot area × maximum FAR − total floor area. Zoning codes define what counts toward floor area (basements, balconies, and parking are treated differently), so confirm the exact rules with your local planning office. Example: A 500 m² lot with a 240 m² footprint and 2 floors has 480 m² of floor area, an FAR of 0.96, and coverage of 48 percent. Under a 1.2 FAR limit, 120 m² of floor area remains.
FAQ
Is this calculator free?
Yes. No signup is needed and nothing you enter is stored.
Is the result exact?
Results are rounded for display. For financial, medical, or legal decisions, confirm with a professional.
Do my numbers leave my device?
No. The calculation runs in your browser.