Mass Ratio

Mass Ratio :The mass ratio MR of the total vehicle or of a particular vehicle stage or of the

propulsion m itself is defined to be the final mass mf divided by the mass before

rocket operation, m0. Here, mf consists of the mass of the vehicle or stage after the
rocket has ceased to operate when all the useful propellant mass mp has been consumed and ejected.

Where:  MR= Mass Ratio

mf = Final Mass

mo = Initial Mass