Subdivision is a crucial technique in mass metrology because it allows the determination of the mass of weights of various nominal values and the realisation of the mass scale.This technique is usually based on complicated mathematics. The current models are generally sufficient for many practical aims but far from the best performance.Project 19RPT02, "Improvement of the realisation of the mass scale" (EMPIR Call 2019 -Research Potential), has been, among others, investigating an improved model for the calculations.