Floor Area Ratio (FAR) Calculator
Construction & Home ImprovementCalculate a building's floor area ratio and check it against a maximum allowed FAR for the lot.
Calculated FAR
Total building floor area divided by lot area.
Maximum Allowed Building Area
3,000.0
Largest total floor area allowed on this lot at the maximum FAR.
Compliance Check
Within allowed FAR
Whether the entered building area is within the maximum allowed FAR for the lot.
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Construction & Home Improvement calculators
Calculator Stats
Creators
Odeh Ahwal0people find this calculator helpful
Views
Helpful
Saved
Embeds
Construction & Home Improvement calculators
Frequently Asked Questions
What is floor area ratio?
Floor area ratio, FAR, is the total floor area of a building across all floors, divided by the area of the lot it sits on. A FAR of 1.0 means the building's combined floor area equals the lot area, for example a 2-story building each floor covering half the lot.
Where do I find my lot's maximum allowed FAR?
Maximum FAR is set by local zoning code and varies significantly by zoning district, from well under 1.0 in low-density residential areas to well over 5.0 in dense urban commercial zones. Check your local planning or zoning department for the exact figure for your parcel.
Does total building floor area include the garage or basement?
It depends on the local zoning code, some exclude basements, attics, or garages from the FAR calculation while others include them. Confirm which spaces count under your specific jurisdiction's definition before relying on this figure for a real permit application.
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