How it works
FAR = building floor area ÷ lot areaboth areas in the same unit
- building floor area
- total floor space, all storeys added
- lot area
- the size of the site
- FAR
- the ratio, often capped by zoning
FAR counts all floors, so a two-storey building covers less ground for the same FAR. Check your local code for what counts as floor area, since basements and garages are sometimes excluded.
Frequently asked questions
What is floor area ratio?
The building's total floor area divided by the lot area, used in zoning.
What is a FAR of 0.5?
The floor area is half the lot area, for example a 4,000 sq ft building on an 8,000 sq ft lot.
Does FAR count every floor?
Yes, all storeys are added together, though some codes exclude basements or parking.
Why does FAR matter?
It caps how much building a lot can hold, shaping density.