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

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## 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:

- First, determine the output RPM.
- The output RPM is given as: 500.

- Next, determine the input RPM.
- The input RPM is provided as: 100.

- 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 ** = ?**