What is FSI - Floor Space Index ?

if you have a single fsi,how much carpet area can you construct on A 500 SQ METER PLOT,PLEASE ADVICE WITH CALCULATIONS...?

Technically,what Anjali has answered defines the FSI. In my opinion,FSI tells more than that of construction. The FSI limits the population of the inhabited area taking in to account transports,parks and other amenities. The purpose is to have healthy environment rather than a large number of cement structures.

as simple as that, FSI- Floor Space Index is the ratio between Total built up area and Total plot area, where there are certain structures or spaces to be excluded from built up area like:

1. SPace under a building constructed on stilts and specifically used as parking space.

2. any area used for parking open to sky.

3. Ramps leading to any area exclusively used for parking.

3. Chowks open to sky.

4. Area cover by otta, steps limited to height of 1.5 mtrs only and ramps, fountains, Septic Tanks, Water tank, swing frame, swimming poool, underground tank, overhead tank, well, boring, tubewell, reservoir and purification plant open to sky.

5. W.C., bathroom of servant quarters, motor garage, storage sheds as permitted in the rear marginal area of ground floor construction only.,constructed in the rear marginal distance upto length of 50% of the width of a plot of ground floor construction with maximum height of 3.6 mtrs and maximum total built up area of 25 sq.mtrs.

6. Architectural projection to the extent of 0.6M.

7. Elevated water tanks and space less than 2.0M.below elevated water tanks.

8. Stair,Ramps and Lift Cabin with Machine Room constructed on terrace to the extent minimum necessary.

9. Open shed of parking constructed in margins may not be considered as construction  and hance shall be exempted from FSI and built Up Calculation.

As per new norms & specification now a day a FSI is defined by depend on " the project is going on on which area & under which political party" specially in MUMBAI.

well defined by Anjali.

Anjali sinha has given very clear answer of the question. No need to add on. Municipal Corporation decide the FSI which is varies areawise, citywise.

I thing so it is one type of boundation . it means stick to certain thing which are not helpful for development of rural india .some pepole culd spread nussance with such type of subject like Grampanchyat .

Sorry Dinesh... But both FSI & FAR are the same

And FAR stands for Floor Area Ratio....

Please refer  http://en.wikipedia.org/wiki/Floor_area_ratio

FSI AND FAR BOTH ARE DIFFERENT WITH EACH OTHER, FSI (FLOOR SPACE INDEX)  IT MEANS LEGALLY PERMISSIBLE AREA OF THE LAND/ PLOT FOR CONSTRUCTION AS PER THE COMPETENT AUTHORITY NORMS. AND THE FAR(FLOOR SPACE INDEX) IT MEANS PERMISSIBLE AREA / FLOOR OF BUILDING FOR CONSTRUCTION.