Welcome to the cheez-y Javascript car calculator page. These calculators were created for a Javascript class I took a few years ago. The excellent air/density calculator at the bottom was stolen from a Mr. Richard Shelquist. I have not asked permission to use it, and hope to not get in trouble. Enjoy using these!

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•The most excellent Corner Weight Calculator ever!

This file is also used without permission. Simply plug in the numbers from your last corner weighing and see the percentages!

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Calculate Horsepower from Trap Speed Vehicle weight in pounds (including driver) lbs Trap speed at end of 1/4 mi in m.p.h. m.p.h. Rear wheel Horsepower: HP Flywheel Horsepower: HP Calculate Horsepower from Elapsed Time Vehicle weight in pounds (including driver) lbs ET in seconds sec Rear wheel Horsepower: HP Flywheel Horsepower: HP Calculate Tire Diameter Tire width - Series - Wheel Diameter Example 275 - 60 R 15 Tire Width Tire Series Wheel Diameter Tire diameter in inches 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, no overdrive. Tire Diameter (in) RPM Speed at RPM (mph) Rear End Gear Ratio Calculate mph for RPM range Tire diameter Gear Ratio This calculation assumes the car's transmission is in drive or 1:1 ratio, no overdrive. For Overdrive cars mutliply the overdrive ratio times the rear and gear ratio. Example a 700R4 transmission has an overdive ratio 0.814:1. For a 4.10 rear end multiply 4.10 x 0.814 = 3.3374. Enter 3.3374 as the number for the gear ratio to calculate speeds in overdive. 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 Density Altitude Calculator Altitude feet Air Temperature degrees F Altimeter Setting inches Hg Dew Point degrees F Density Altitude feet Absolute Pressure inches Hg Relative Density % Additional Information: Click here for National Weather Service (NWS) information, including listing of hourly dew point and altimeter setting for US locations, in both English and Metric units. Example:  at 5050 feet altitude, 95 deg F air temp,  29.45 inches-Hg altimeter setting and a dew point of 67 deg F, the Density Altitude is calculated as 9252 feet.