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Speed vs. RPM For Tire and 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.

Tire Diameter
(inches)
Calc Tire Diameter

Rear End Gear Ratio
(Inches)
Select a Transmission
Torque Converter Slip
1st Gear Ratio
2nd Gear Ratio
3rd Gear Ratio
4th Gear Ratio
5th Gear Ratio
6th Gear Ratio

Calculator requires a subscription.

A real accurate way to determine your tire diameter is to draw a line on the bottom of your tire, then draw a line on the ground which lines up with the line you just drew on your tire. Then move the car until the car makes one full rotation of the tire and mark the ground where the line on the tire is at the bottom again. Now measure the length between the two lines and divide by pi (3.14) and you'll have your tire diameter to use on the calculator (don't forget to use inches). This is the preffered method to use in determining your actual tire diameter.

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