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Calculate Rear End Gear Ratio
By using SMOKEmUP.com's automath you agree to use this service for your own personal use. Re-transmission, performing calculations for others is PROHIBITED and will result in termination of your account with no refund.

Not sure what rear end gear ratio you have in your car? This calculation will give you an idea of the gear ratio in the rear end. You need to know the rpm's of the motor at a certain speed as indicated by your speedometer. NOTE your speedometer must be accurate, if yours is not have a friend drive next to you at a certain speed. This calculation assumes the car's transmission is in drive or 1:1 ratio, no overdrive.



Tire Diameter (in)
Speed (mph)
RPM

Calculator requires a subscription.



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