Enter the input gear teeth and the output gear teeth into the Calculator. The calculator will evaluate the Speed Increase Ratio.

## Speed Increase Ratio Formula

SIR = IGT / OGT

Variables:

- SIR is the Speed Increase Ratio ()
- IGT is the input gear teeth
- OGT is the output gear teeth

To calculate Speed Increase Ratio,

## How to Calculate Speed Increase Ratio?

The following steps outline how to calculate the Speed Increase Ratio.

- First, determine the input gear teeth.
- Next, determine the output gear teeth.
- Next, gather the formula from above = SIR = IGT / OGT.
- Finally, calculate the Speed Increase Ratio.
- After inserting the variables and calculating the result, check your answer with the calculator above.

**Example Problem : **

Use the following variables as an example problem to test your knowledge.

input gear teeth = 20

output gear teeth = 10