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Gear Ratio Calculator >>

Gear Ratios Calculator, MPH, Top Speed

 


This calculator outputs the how fast a car can go in each gear as calculated by the gear ratios, engine redline and tire size.
The ultimate top speed may be limted by the power, drag and aerodynamics of each individual car.

If you like this calculator use the Google +1 button:

Tire Size
(345/30/20)
/ -
OR
Tire Diameter
(inches)
 
Final Drive Ratio
Redline (RPM)
1st Gear
2nd Gear
3rd Gear
4th Gear
5th Gear
6th Gear
7th Gear
8th Gear

Listed below are some preset saved cars to browse though, if you have gear ratios for your car you can add them to our gear ratio database.

2012 BMW 650i - 8 speed automatic
2011 BMW M3 E90 M3 - manual
2013 BMW M5 - 7 speed DCT
2013 BMW M5 - 6 speed manual
2013 BMW M6 - 7 speed DCT
2011 Bugatti Veyron - 7 speed DCT
2012 Cadillac CTS-V - 6 speed manual
1997 Chevrolet Camaro Z28 - 4L60E
2012 Chevrolet Camaro ZL1 - 6 speed manual
2012 Chevrolet Camaro ZL1 - 6 speed automatic
1972 Chevrolet Chevelle Malibu - th400
2001 Chevrolet Corvette 98tadriver's C5 - 4L60E
2013 Chevrolet Corvette - 6 speed manual
2013 Chevrolet Corvette Z06 - 6 speed manual
2013 Chevrolet Corvette ZR1 - 6 speed manual
2011 Dodge Challenger R/T - TR6060
1996 Dodge Viper GTS - 6 speed manual
2013 Dodge Viper GTS - 6 speed manual
2009 Dodge Viper ACR - 6 speed manual
2010 Dodge Viper ACR - 6 speed manual
2012 Ferrari 458 Italia - 7 speed DCT
2012 Fiat 500 Abarth - 5 Speed Manual
2005 Ford GT - Ricardo 6 speed manual
2008 Ford Mustang - Tremec TR-3650
2011 Ford Mustang - Auto
1985 Ford Mustang GT - TKO500
2013 Ford Mustang Shelby-GT500 - 6 speed manual
2010 Ford Mustang Shelby-GT500 - 6 speed manual
2012 Lamborghini Aventador - 7 speed ISR
2005 Lamborghini Gallardo -
2010 Lamborghini Gallardo LP560-4 - E-Gear
2004 Lamborghini Gallardo -
2006 Lamborghini Gallardo -
2013 Lexus IS-F sedan - auto
2013 Mazda Miata MX5 - 5 speed manual
2013 Mazda Miata MX5 - 6 speed automatic
2004 Mazda RX-8 4-Door Coupe - Manual
2012 McLaren MP4-12C - 7 speed DCT
2012 Mercedes-Benz E63 AMG BiTurbo - 7 speed mct
2013 Mercedes-Benz SLS AMG GT - 7 speed automatic
2012 Nissan 370Z - 6 speed manual
2012 Nissan 370Z - 6 speed automatic
2010 Nissan 370Z - 7 speed auto
2012 Nissan GT-R - 6 speed dual clutch
1967 Pontiac GTO Hardtop - Richmond SS 5 Speed
2011 Porsche 911 Turbo S - 7 speed PDK
2004 Porsche Carrera GT - 6 speed manual
2013 Scion FR-S - 6 speed manual
2013 Subaru BRZ - 6 speed manual
2013 Subaru Impreza WRX - 5 speed manual
2002 Volkswagen Passat 1.9 TDI AWX - MANUAL 5SP FHN





Some additional information on how these are calculated:

When D is the diameter of the tire, the car moves forward a distance πD with each revolution of the tire. If there are F revolutions per unit of time, it moves forward at a speed of πD´F per unit of time. If D is in inches and F is in revolutions per minute (rpm), the above result will be in inches per minute. There are 63,360 inches in a mile and 60 minutes in an hour, so one inch per minute equals 60/63360 miles per hour or 1/1056 mph. So we have the following formula:

V(mph) = D(in) ´ F(rpm) ´ (π/1056)

In the automotive industry, the coefficient 1056/π is usually taken to be equal to 336 (exactly it is 336.1352398...) and the formula corresponding to the above is:

(mph)(gear ratio)(336) = (tire diameter in inches)(rpm)

With the above numerical approximation, both formulas are identical if we consider that (rpm)/(gear ratio) is the rate of rotation of the tires. So the "gear ratio" as the number of rotations of the driveshaft for each turn of the tire. This ratio is normally more than 1, except in overdrive gear. So, calling R the "gear ratio", your final answer is:

V(mph) = D(in) ´ F(rpm) ´ (π/1056) / R

or, approximately: V = (D ´ F) / (336 ´ R)

where V is the velocity (in mph), D the tire diameter (in inches), F the engine rpm, and R the gear ratio.

 


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