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# What is Floor Space Index, Formula & Why is it Important?

## What Is the Floor Space Index Formula?

Following given is the formula for computation of floor space index:

Floor space index (FSI) or floor area ratio (FAR) = total built-up area / total area of the plot

Total built-up area= total area of plot X FSI allotted

For a clearer understanding, an illustration of FSI calculation is given below:

Suppose there is a plot of an area of 10,000 square metres. FSI of 1.5 is permitted. Then, the construction of a total of 15000 square metres will be allowed on that piece of land. This is also applicable to commercial buildings.

 Plot of the area 10,000 square metres FSI permitted 1.5 Permitted construction area 15,000 square metres (10,000*1.5)

## What Is a Premium Floor Space Index?

 Minimum road width 30 feet FSI of roads 30-40 feet wide 20% more FSI of roads 40-60 feet wide 30% more FSI of roads wider than 60 feet 40% more

## Floor Space Index for Top Cities in India

In the following table, you will get to know about the minimum and maximum floor space index for some of the important cities in India as determined by their respective local authorities:

 Local Authority Residential FSI Commercial FSI Kolkata Municipal Corporation 1.25-3 2-3 Municipal Corporation of Greater Mumbai 1-4 1-5 Bruhat Bengaluru Mahanagar Palike 1.75-3.25 1.5-3.25 Noida Authority 2.75-3 1-4 Chennai Metropolitan Development Authority 2-4.87 0.75-1.5
Floor space index of a project holds immense significance as it helps maintain only legalised and authorised construction. It also keeps the balance between open space and space for construction. The role of FSI in the construction of real estate is non-negotiable.