Racing Calculators
A free suite of car performance calculators, estimate ET, horsepower, gearing, tire size and more. Every estimate is a starting point; verify your real numbers with free GPS timing in the FastTrack app.
All Calculators
- Quarter Mile Calculator, ET & Trap Speed
- Horsepower Calculator, HP from ET & Trap Speed
- Trap Speed Calculator, 1/4-Mile MPH from HP
- Power-to-Weight Ratio Calculator, hp/ton, hp/kg
- Gear Ratio Calculator, MPH at RPM & RPM at MPH
- Tire Size Calculator, Diameter & Revs per Mile
- E85 Mix Calculator, Blend to a Target Ethanol %
- Density Altitude Correction Calculator, Correct ET & Trap