The gear motor ratio is a measure of how much the speed and torque of a motor are changed by the gears. The gear motor ratio is calculated by dividing the number of teeth on the output gear by the number of teeth on the input gear. The higher the gear motor ratio, the lower the output speed and the higher the output torque. The lower the gear motor ratio, the higher the output speed and the lower the output torque. The gear motor ratio affects the performance and efficiency of a gear motor and should be matched to the application requirements.