Quarter Mile Calculator
Estimate quarter-mile ET and trap speed from vehicle weight and horsepower using the Hale formula.
How It Works
Enter vehicle weight and wheel horsepower. The calculator uses the Hale/quarter-mile performance formula to estimate elapsed time (ET) and trap speed.
Formula
ET = 6.269 x (Weight/HP)^0.3333 | Trap Speed = 234 x (HP/Weight)^0.3333
Frequently Asked Questions
What is the Hale formula?
The Hale formula is an empirical equation developed from drag racing data relating power-to-weight ratio to quarter-mile elapsed time and trap speed. It is widely used for stock and mildly modified vehicles.
Does this include reaction time?
No. This calculator estimates only the vehicle performance portion of the ET. Official drag racing ET includes reaction time (typically 0.4-0.7 seconds for street drivers).