Drive Ratio Calculator

Figuring out drive ratio changes, is made easy with this calculator.

Change the numbers to your own. To calculate, click out of box or press your ‘Tab’ key.

  • Enter your motor rpm and the gear ratio of your reducer
    • (if no reducer is present set the ratio at 1:1).
  • For Belt Pulleys enter the diameter of the pulleys
  • For Sprockets enter the number teeth on the sprocket.
  • You can enter drive ratios instead of pulleys and sprockets.
  • Adjust the belt pulley or sprocket you want to change until you achieve your desired Final RPM.

Electric Motor RPM Out >
Belt/Chain
Reducer Gearbox In <
/ 1 Ratio Out >
Belt/Chain
< Out In <
Belt/Chain
> In Out >
Belt/Chain
Final RPM In <