Floor Area Ratio Calculator

Your details

Choose what you want to solve for. FAR mode finds the ratio; Max area mode finds how much floor area you can build; Footprint mode estimates FAR from a building outline and number of storeys.
Total area of the land parcel, also called the plot or site area.
ft²
Gross floor area: the sum of all floors measured between the outer faces of external walls.
ft²
Floor Area Ratio (FAR)Medium density
2.5

Total floor area divided by lot area (dimensionless)

FAR as percentage2.5%
2.5
Very low density<0.5Low density0.5-1Medium density1-2.5High density2.5-5Very high density5+

FAR is 2.50 - this site is medium density.

  • A FAR of 2.50 is considered medium density (common for mid-rise mixed-use or multi-family).
  • FAR limits vary widely by jurisdiction and zoning district. Always verify the allowed FAR with your local planning department before designing or purchasing.

Next stepSwitch to "Max buildable area" mode and enter your zoning-allowed FAR to see how much floor area you are still permitted to add.

 = Powered by OnlyCalculators