Torque is the force required to rotate a shaft or element at a certain speed. It is a common parameter used with electric motors, which use torque to convert electrical energy to mechanical energy. Peak torque is the maximum torque that a machine or motor can produce to achieve a given number of revolutions per minute, or rpm.
Things You'll Need
Find the horsepower of the motor or equipment. It should be displayed on the nametag on the motor or equipment; if not, refer to the manufacturer's specifications.
Find the peak speed of the motor or engine in rpm. It should be displayed on the nametag on the motor or equipment; if not, refer to the manufacturer's specifications.
Calculate torque (T) using the formula T = 5,252 x horsepower/rpm. The results are measured in pound-feet. For example, if you have a 40-horsepower motor designed to operate at a peak of 1,200 rpm, the formula would be T = (5,252 x 40)/1200 = 175.07 lb.-feet.