1. An article of manufacture tangibly embodying a non-transitory computer readable medium containing instructions which, when executed by a computer, cause the computer to carry out steps of a method for modeling fin field effect transistor (FinFET) width quantization comprising: fitting points of a curve representing a FinFET model of a FinFET device to points of a curve representing single fin current and voltage characteristics, where the FinFET device comprises a plurality of fins; obtaining statistical data of sample FinFET devices, where the statistical data comprises drain induced barrier lowering (DIBL) data and subthreshold slope data; and fitting the FinFET model to a variation in a current to turn off the FinFET devices (I off ) in the statistical data using the DIBL data and the subthreshold slope data, where fitting the FinFET model comprises determining a model for a FinFET devices turn-off voltage parameter, V OFF , where the V OFF parameter changes subthreshold behavior but not on-state behavior.