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In Bangalore we call Floor Area Ratio (FAR) or In Mumbai floor space index (FSI) is the ratio of the total floor area of buildings on a certain location to the size of the land of that location, or the limit imposed on such a ratio.
As a formula: Floor area ratio = (Total covered area on all floors of all buildings on a certain plot)/(Area of the plot) Thus, an FSI of 2.0 would indicate that the total floor area of a building is two times the gross area of the plot on which it is constructed, as would be found in a multiplestory building. For any clarifications feel free to revert sales@amita.co.in , Amita Realty  Bangalore Refer : http://mk.cm/1RM
Answered on September 1, 2011 by Amita Realty 
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Floor Space Index.
Answered on July 22, 2011 by Sameer Sarguroh 
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The FSI IS 1.00 TOTAL LAND 45000 SQ FIT AND CONSTRUCTION WILL BE 55000 SQ FIT
Answered on July 8, 2011 by Raj Kathote 
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PROJECT SHANTINIKETAN NAGPUR (MAHARASTRA) 2 BHK 988 TO ,1057 SQ FIT IT super biltup area and 3 BHK 1256 TO 1298 SQ FIT Is super biltup area all flat full furnish with garden, comunity hall, ample parking, indoor game, Intercom syst , gymnashiam, lift with powerback
Answered on July 8, 2011 by Raj Kathote 
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FSI is for a project is can be obtained by dividing the total carpet area of all flats in the project divided by the land area of the project.
Answered on June 7, 2011 by Priyank Vaish 
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floor space index is the proportion ratio for ground area and floor area of the structure
Answered on May 4, 2011 by Neha Chadha 
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That was correct answer
Answered on May 4, 2011 by R Vijayanandhan 
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The floor space index (FSI) is the ratio of the total floor area of buildings on a certain location to the size of the land of that location, or the limit imposed on such a ratio.
As a formula: Floor area ratio = (Total covered area on all floors of all buildings on a certain plot)/(Area of the plot)
Answered on May 4, 2011 by Raman Deep Singh 
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Tecnically, FSI means what Raman sir has said. But for a layman FSI is the total built up area a builder is permitted to contruct on the specified land.

floor space index (FSI) is the ratio of the total floor area of buildings on a certain location to the size of the land of that location, or the limit imposed on such a ratio.
Answered on May 4, 2011 by Kunal Singh 
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The Floor Space Index (FSI) or Floor Area Ratio (FAR) is the ratio of the total floor area of buildings on a certain location to the size of the land of that location.
As a formula: Floor Area Ratio = (Total covered area on all floors of all buildings on a certain plot)/(Area of the plot)
Thus, an FSI of 2.0 would indicate that the total floor area of a building is two times the gross area of the plot on which it is constructed
Floor Area Ratio in zoning
The Floor Area Ratio can be used in zoning to limit the amount that can be built in a certain area. For example, if the relevant zoning ordinance permits construction on a parcel, and construction must adhere to a .1 floor area ratio, then the total area of all floors in all buildings constructed on the parcel must be no more than onetenth the area of the parcel itself.
A builder can plan for either a singlestory building consuming the entire allowable area in one floor, or a multistory building that rises higher above the plane of the land, but which must consequently result in a smaller footprint than would a singlestory building of the same total floor area. By combining the horizontal and vertical limits into a single figure, some flexibility is permitted in building design, while achieving a hard limit on at least one measure of overall size. One advantage to fixing this parameter, as opposed to others such as height, width, or length, is that floor area correlates well with other considerations relevant to zoning regulation, such as total parking that would be required for an office building, total number of units that might be available for residential use, total load on municipal services, etc. The amounts of these things tend to be constant for a given total floor area, regardess of how that area is distributed horizontally and vertically.
FAR Explained
http://www.carfree.com/far.html (picture refers)
A FAR of 1.0
The illustration above shows a Floor Area Ratio (FAR) of 1.0. This simply means that, if the area of the plot is 100 square meters, then 100 square meters of gross floor area has been built on the plot. The illustration above shows a 4story building covering 1/4 of the site, giving a FAR of 1.0. Four floors of 25 square meters each are built on a site of 100 square meters.
The reference design for carfree cities is based on a FAR of 1.5. Here are some ways to get to a FAR of 1.5:
Build a 2story building on 75% of the site (2 x 0.75 = 1.5)
Build a 3story building on 50% of the site (3 x 0.5 = 1.5)
Build a 4story building on 37.5% of the site (4 x 0.375 = 1.5)
It will be noted that a FAR of 1.5 is quite high, although this density is not unusual in Venice or central Paris, and is considerably exceeded in most of Manhattan. It requires 4story buildings and narrow streets with modest interior courtyards. (Higher buildings would leave more room for streets and gardens, but buildings higher than 4 stories are not desirable because they are expensive to construct and unpleasant to live in.)
Answered on May 4, 2011 by Ojash Salia 
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Floor Space Index – it is the ratio between area of the plot and total carpet area allowed to be constructed on that plot. For example on a plot size of 20000 sq ft and having FSI of 1.5, the total carpet area allowed to be constructed will be 30000 sq ft. Certain common areas like staicases can be excluded from the FSI calculations.
