The calculator below can be used to calculate effort force in block, tackle or pulley construction. The calculator can be used for metric and imperial units as long as the use of units are consistent., The Speed Pulley Calculator calculate the output speed of a pulley based on the input speed of a driving pulley and diameters of both pulleys., Example Calculation. Suppose: Pulley 1 has a diameter of 10 inches and a speed of 150 RPM. Pulley 2 has a diameter of 20 inches. We can calculate the speed of pulley 2 as follows: \[ s_2 = \frac{d_1}{d_2} \times s_1 = \frac{10}{20} \times 150 = 75 \, \text{RPM} \] Thus, pulley 2 will rotate at 75 RPM. Importance and Usage Scenarios, The following steps outline how to calculate the Pulley Size. First, determine the diameter of the drive pulley (DP_d) in inches. Next, determine the RPM of the drive pulley (RPM_d)., This calculator helps determine the RPM of a second pulley based on the diameters and rotation rates of both pulleys, useful in mechanical and engineering applications., Our pulley calculator helps you determine the mechanical advantage and required force for your pulley system with ease. To use the pulley calculator, simply enter the total load you need to lift and the number of pulleys being used in the system..