# FSI Calculation

How do you calculate FSI (Floor Space Index)?

## How to Calculate Floor Space Index?

FSI stands for **Floor Space Index** (FSI). It is the ratio of total land area to the buildings total floor area. It is also referred as **Floor area ratio.**

**Formula for FSI Calculation**

Flood Space Index formula is

FSI = Total Constructed Area** / ** **Total Land**** Area**

Step 1: Let us consider an example to calculate the Floor Space Index value.

Assume, a building contractor constructs 100 flats which is of 600 sq.ft and 200 flat which is of 1000 sq.ft. The total land area is 3 acres. Find the floor space index of the land.

**Step 2:** We know that 1 acres = 43,560 square feet.

So, **3 acres = 1,30,680 sq.ft**

Click on the below link to convert acres to any unit conversion

**Step 3:** Find the total constructed area.

Total flat area is 100 flats of 600 Sq.ft and 200 flats of 1000 Sq.ft.

Total constructed area = (100 x 600) + (200 x 1000) = 60,000 + 2,00,000

**Total constructed area = 2,60,000 Sq.ft**

**Step 4: **To find FSI, substitute the obtained values in the formula.

FSI = Total Constructed Area / Total Land Area

= 2,60,000 /1,30,680

**FSI = 1.989**

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