Gear Ratio is a handy pocket reference for calculating gear ratio, overall driveline ratio, and vehicle speed in both US and Metric units. Gear Ratio will work for karts, race cars, bicycles, trucks, or any other vehicle type.

Gear Ratio provides six independent input pages. So you may enter, check, and save multiple scenarios. The history is saved so last value entries can be reviewed for quick and easy reference.

Email your data to save it on your computer or send it to a race buddy for review. Just click on the "Send" button to email the calculation results.

Gear Ratio is designed to work hassle-free. Simply type a value into any one of the inputs, and it is immediately converted into the each of the other types.