FSI is the abbreviation of the Floor Space Index, Whilst FAR is for Floor Area Ratio. They both are used as a part of Building Bye-Laws.
Floor Space Index or FSI is defined as the ratio of the total carped area or total floor area of a building to the area of land on which the building stands.
Calculation of Floor Space Index
Let’s take an example. Suppose we have a four storied building with the following data.
Area of ground floor = 140 m2
Area of first floor = 140 m2 (same as above)
Area of second floor = 80 m2 (due to setback)
Area of third floor = 80 m2
And the area of land on which the building stands is 300 square meters.
Here we have a total floor area is 140 * 2+ 80 * 2= 440 square meters.
Now we will divide the total floor area by the land area.
In this case, FAR is = 1.47
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