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Gear Calculator

 
 
 
 

 

Estimate Your Horsepower!

 (THIS IS JUST AN ESTIMATE BASED ON SIMPLE CALCULATIONS!)

 

Calculate mph for RPM range

 
Tire diameter

Gear Ratio


This calculation assumes the car's transmission is in drive or 1:1 ratio.
 
1000 rpm mph 4500 rpm mph
1500 rpm mph 5000 rpm mph
2000 rpm mph 5500 rpm mph
2500 rpm mph 6000 rpm mph
3000 rpm mph 6500 rpm mph
3500 rpm mph 7000 rpm mph
4000 rpm mph 7500 rpm mph



 

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,
 

Tire Diameter (in)

 

 RPM

 

 Speed at RPM (mph)

 

 


Rear End Gear Ratio


 

 

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