The Floor Space Index (F.S.I) is the ratio of the total floor areas involving all walls on all floors, to the area of the plot or land on which the building structure stands. It is also known as Floor Area Ratio (F.A.R) in several cities.

The local government body determines the value of F.S.I of the building, which may vary for different buildings and locations around the city.

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**How to use FSI Calculator :**

All steps to use F.S.I calculator are given below :

- Enter the total construction area of your house or building in first field. If you have multiple floors in building then add up total area of all floors.
- Enter the plot area (plot size) on which the house or building is built in second field.
- From entered values, the F.S.I calculator will automatically determine the Floor Space Index (F.S.I).

**What is the meaning of Floor Space Index (F.S.I)?**

The Floor Space Index (F.S.I) is the ratio of the total floor areas involving all walls on all floors, to the area of the plot or land on which the building structure stands. This is the numeric value shown in the total amount of area on all floors you can build upon a plot. It is also known as Floor Area Ratio (F.A.R) in several cities.

The local government body determines the value of F.S.I of the building, which may vary for different buildings and locations around the city.

**How to calculate the Floor Space Index (F.S.I) for Building**

Assume you have a land of 6000 sq.ft and you desire to construct a building on that land, the first thing you require to know is what kind of building you want to construct. Whether you are planning to construct an ordinary building (up to two floors), a special building (more than two floors not exceeding four floors) or multi storey building exceeding four floors.

Find out your FSI zone which you can search on the official website of your state government. Normally, different buildings have different Floor Space Index (F.S.I) regardless of location. For the same location Floor Space Index (F.S.I) can be different for ordinary buildings and special types of building.

Let us suppose that the zone in which you want to construct the building has a Floor Space Index (F.S.I) of 1.5 for a special building, now you can build 9000 sq ft (6000 sq ft x 1.5) covered area on your land. You can have either option for 2 floors of 4500 sq ft or 3 floors of 3000 sq ft without affecting other municipal rules.

You should also note that you have to follow other rules of the municipality like front-back-side and rear set back, min plot extent area, Open Space Ratio (OSR) and parking area etc.

**What is the Premium Floor Space Index (F.S.I)?**

If you require to extend the permissible Floor Space Index (F.S.I) you have to pay a premium charge to the government. To avail this Floor Space Index (F.S.I) the road land must be at least 30 ft wide.

- 30 ft to 40 ft road width = 20% premium Floor Space Index (F.S.I)
- 40 ft to 60 ft road width = 30% premium Floor Space Index (F.S.I)
- Greater than 60 ft road width = 40% premium Floor Space Index (F.S.I) can be availed.

If the building location has 30 ft to 40 ft road width then you can avail the premium Floor Space Index (F.S.I) of 20%, which means you can build 20% more than permissible Floor Space Index (F.S.I).

**FAQs on Floor Space Index (F.S.I)**

#### What does 1.5 FSI mean?

1.5 FSI define as total built up are permited on plot a plot can be 1.5 times the plot area.

#### What is the meaning of FSI?

The Floor Space Index (F.S.I) is the ratio of the total floor areas involving all walls on all floors, to the area of the plot or land on which the building structure stands.

#### How many Floors is 2.5 FSI?

If the FSI is 2.5 and you have a 1500 sq ft plot. Then, as per formula: FSI = Total Floor Area of all Floors of the Building / Plot Area. So, Total Floor Area of all Floors of Building = 2.5 x 1500 = 3750 sq ft. Your permit to build up to 3750 sq ft area.

#### What is plinth area?

Plinth area is define as the covered built up area measured at the floor level of any storey of a building. It is appx. 10% to 20% more than the carpet area.

Thank you so much for sharing FSI information. Very useful FSI calculator.