Field efficiency is a main factor for obtaining high productivity of agricultural machinery. The aim of this paper was to determine the field efficiency of KTP 2M and CASE IH 8000 sugarcane harvester machines, working with different lengths of cutting fronts. The research was carried out in the Panchito Gómez Toro area of production, belonging to Sugar Enterprise, Villa Clara, during February and March 2020. The main movement times of the harvester inside the field was obtained by stop watch, as well as the fuel consumption during the works. The influence of the length of the cutting fronts on the turning time, time for completing the task and field efficiency were determined according to the sugarcane yield. The results show that lengths of cutting front less than 300 m, represent greater losses in time and higher rate of fuel consumption.Lengths of cutting fronts greater than 500 m, do not represent an increase in field efficiency.