These calculators requires the use of Javascript enabled and capable browsers.

 

 

Engine RPM Calculator

These calculators are designed to give the approximate engine RPM (revolutions per minute) based on data entered. You must enter ring gear and pinion gear ratio, the height of the tires (diameter from ground to top of the tire while mounted on the vehicle), vehicle speed and the transmission final gear ratio. You may try entering different combinations of speed and gear ratios.

All Transmission Final Gear Ratios

Required Data Entry

Ring Gear and Pinion Ratio (3.08, 3.55, etc.)

Tire Height (24.5, 26, 27.5, etc.)

MPH

   

Calculated Results All Transmissions

Auto

AOD

Manual

5 Speed

Transmission Final Gear Ratio Manual Entry
Required Data Entry
Ring Gear and Pinion Ratio (3.08, 3.55, etc.)
Tire Height (24.5, 26, 27.5, etc.)
MPH
Transmission Final Gear Ratio (2.54, 1.43, 1.00, etc.)
   
Calculated Results
Engine RPM

 

Differential Gear Ratio Calculator

 

Enter the maximum potential safe engine RPM. Enter the tire size diameter and the target vehicle speed in MPH. Click on Calculate Differential Gear Ratio. The value will be returned in estimated differential gear ratio, based on the entered values. To do another, click the Clear Values button and then enter a new set of values. Calculated accuracy of current Javascript enabled browsers is generally 16 places.

 

Enter Potential Maximum Safe Engine RPM

Enter Tire Size Diameter

Enter Desired Target MPH

     

Rear End Gear Ratio Needed

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