Floor area ratio (FAR), floor space ratio (FSR), floor space index (FSI), site ratio and plot ratio are all terms for the ratio of a building's total floor area to the size of the parcel of land upon which it is built. The terms can also refer to limits imposed on such a ratio.
As a formula: Floor area ratio = (total covered area on all floors of all buildings on a certain plot)/(area of the plot)
Thus, an FSI of 2.0 would indicate that the total floor area of a building is two times the gross area of the plot on which it is constructed, as would be found in a multiple-story building.
Read more about Floor Area Ratio: Terminology, Use in Zoning, Impact On Land Value, Criticism
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