# Utilizing the final drive calculator tool

The C.H.A.S.E.R final drive calculator is a tool made to calculate what final drive you should use for a determinated gear ratio set.\
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You don't need this for ezchaserprofile, as it automaticaly calculates it when you first import the URL, however, it also can be used in it, if you edit the gear ratio manually.\
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[You can download it here.](https://github.com/LegacyDMC/chaserdemo/releases/tag/chasercalculator)\
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To use it, simply:\
Insert the vehicle topspeed\
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Then, add the gear ratios on their respective slot\
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For the Reverse Gear, make sure to use negative gear ratio, so if it's listed as 2.0, insert it as -2.0\
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![](/files/LnVRrE6WZTUVWR60ziXf)\
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Example of a properly filled setup, showing results at the bottom:\
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![](/files/rZnKss6sSYyIOcl8M49A)


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