Rear End Gear Ratio Calculator

Rear End Gear Ratio Calculator

These calculators will help you figure out your Rear End Gear Ratio depending on the tire diameter and MPH. Fill in the fields below and click the "Calculate" button. JavaScript must be enabled in your browser for the calculation to work.

 

Calculate Rear End Gear Ratio
Enter the tire diameter in inches, rpm's of the motor at a certain speed as indicated by your speedometer in mph. This calculation assumes the car's transmission is in drive or 1:1 ratio, no overdrive.
Tire Diameter (in)
 RPM
 Speed at RPM (mph)


Rear End Gear Ratio