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

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