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To sale building density as a source of income for Tehran Municipality became quite popular during the decade of nineties
This has various impact on quality of urban life. Increase of housing cost, environmental degradation and low standard of urban services, traffic problems, all are the result of such type of influences in Tehran.
Beside that, determining of F.A.R has not been followed as a scientific method and as a basis related to the available infrastructures.
In this paper, in addition to defining various residential densities, the existing density in Tehran and its role in traffic problems has been studied in Elahieh , Tehran. Finally a method for F.A.R. calculation has been proposed on the basis of available infrastructures specially with respect to the capacity and level of services (L.O.S) of the traffic network.
The result of the study shows that F.A.R has not been only used as a tool to create a balance between infrastructure and population but also creates a number of other problems.