This work presents a procedure based on the method of Krause et al. (2013) to estimate sub-core permeability distribution and characteristic relative permeability from coreflooding experimental data. The new procedure employs a simplified model for characteristic curve estimation developed in Rabinovich and Darkwah (2019), requiring only solutions of steady state single-phase flow equations. Therefore, the computational time is significantly reduced. The method is also extended to combine data from a number of experiments with different fractional flow of injection.