Theoretical Top Speed Calculator

This here'll calculate the theoretical top speed of your car discarding rolling resistance, wind, insects, photons hitting you, and other such real world stuff. PLEASE KEEP IN MIND THESE NUMBERS IGNORE ALOT OF VARIABLES, NO A STOCK FIREBIRD DOES NOT GO 400 KM/H, OK!? :)

Tire Width (mm):

Aspect Ratio:

Wheel Diameter (inches):

Rev Limit (RPMs):

Overdrive Gear Ratio:

Final Drive Ratio:

Tire Circumference (inches):

Tire Diameter (tallness) in inches:

Theoretical Top Speed (KM/H):

Theoretical Top Speed (MPH):

Example
Click for an example of a '87 Volvo 740 Wagon with the stock M46 overdrive and 3.31 stock rear-end gears, as well as stock tire size. .

Glossary
Tire Width (mm): The width of your tire in millimeters. Check your tire specifications and look for: 195/55ZR15 (example).

Aspect Ratio: The ratio of tire wall width to tire width. Use whole numbers! Check your tire specifications and look for: 195/55ZR15 (example).

Wheel Diameter (inches): The diameter of your wheels in inches. Check your tire specifications and look for: 195/55ZR15 (example).

Rev Limit (RPMs): Point at which fuel/ignition or whatever is cut off from engine. Example for a BMW M20B25 is: 6750 RPMs.

Overdrive Ratio: Gear ratio at 5th or 6th gear depending on the type of manual transmission for your car. Most automatics have only 4 gears. Check your car's owners manual for details. Example for a Ford Crown Vic automatic is: 0.67

Final Drive Ratio: Final drive ratio of your car. Check your car's owners manual for details. Example for an Acura Integra GSR is: 4.440.