Gear & Transmission Calculators

Calculators to help you out

Performance Calculators

Find out what you need to get the job done!

While our POWERTRAX tech support line is available during normal business hours, our calculators will help to get your dragster, funny car, street machine or off-road rig to the next level.

Contact POWERTRAX tech support here. Or, call us at 800-934-2727 M-F 7-7 CST.


Drag Performance Calculator

Enter your 1/4 mile race car's information into our calculator to see how well you will perform. Then, change gear ratios and beat your best time!

Access Drag Performance Calculator

Street Performance Calculator

This calculator will help your hot rod or street machine get to the next level without red-lining your engine. The Street Performance calculator is also handy when changing tire sizes on street rods.

Access Street Performance Calculator

Optimum Transmission Gear Ratios Calculator

Considering changing the size of your tires? Use this gear ratio calculator to see what ring & pinion gear ratio will be right for you after a tire size change.

Access Optimum Transmission Gear Ratios Calculator