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Potential Engine Speed (RPM) Calculator

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This calculator requires the use of a Javascript enabled web browser.

  • Enter the vehicle speed in MPH.
  • Enter the differential gear ratio for front or rear.
  • Enter the selected transmission gear ratio.
  • Click on Calculate Potential Engine Speed.

The value will be returned in estimated potential engine speed in RPMs. To do another, click the Clear Values button and then enter new values. Calculated accuracy of current Javascript enabled browsers is generally 16 places.

Data Entry
Enter Vehicle Speed In MPH
Enter Tire Size Diameter
Enter Differential Gear Ratio :1
Enter Selected Transmission Gear Ratio :1
Calculated Engine Speed In RPMs

Please be advised:  The accuracy of this calculator and its applicability to your circumstances is not guaranteed. It's meant to be used as an informational guide only. Always obtain professional advice from qualified automotive professionals.