Enter the output RPM and the input RPM into the RPM Gear Ratio Calculator. The calculator will evaluate and display the RPM Gear Ratio. 

RPM Gear Ratio Formula

The following formula is used to calculate the RPM Gear Ratio. 

RGR = O / I 

  • Where RGR is the RPM Gear Ratio (output:input)
  • O is the output RPM 
  • I is the input RPM 

How to Calculate RPM Gear Ratio?

The following example problems outline how to calculate RPM Gear Ratio.

Example Problem #1:

  1. First, determine the output RPM. 
    • The output RPM is given as: 500.
  2. Next, determine the input RPM. 
    • The input RPM is provided as: 100.
  3. Finally, calculate the RPM Gear Ratio using the equation above: 

RGR = O / I 

The values given above are inserted into the equation below and the solution is calculated:

RGR = 500 / 100  = 5:1 (output:input)

Example Problem #2: 

For this problem, the variables required are provided below:

output RPM = 600

input RPM = 200

Test your knowledge using the equation and check your answer with the calculator above.

RGR = O / I  = ?