I have calculated electron mobility of KSnI3 perovskite from it's band structure with the equation; μ= (eτ)/(m*), where τ is the relaxation time, e is electron charge and m* is effective mass of electron. The unit of the electron mobility I got is coulomb. sec. Kg-1. I want to convert the unit to cm^2/Vs. Can any one suggest me how to make this unit conversion?