Transmission Ratio RPM Calculator

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Determine your engine’s RPM based on the transmission gear ratio, tire height, MPH, and the ratio of your ring gear and pinion gear.

This calculator will provide the speed of the vehicle based on transmission gear ratio, engine RPM, tire height, and the ring gear and pinion gear ratio in the rear end axle differential housing.

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This calculator will provide the speed of the vehicle based on transmission gear ratio, engine RPM, tire height, and the ring gear and pinion gear ratio in the rear end axle differential housing. 

This calculator assumes you know the vehicle’s transmission ratio.

Please refer to the Gear Ratio Calculator to determine your rear end axle differential ratio.

Please refer to the Tire Height Calculator to determine your tire height.

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These tools provide mathematical calculations only. The instructional videos are intended only to provide guidance on how the calculators operate and are illustrative only. Neither the calculators nor the associated videos are intended to provide advice or information on vehicle operation, maintenance or safety. Dana makes no representation as to what equipment or use is appropriate for any specific vehicle.

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