Quarter Mile Calculator
Estimate quarter-mile elapsed time and trap speed from vehicle horsepower and weight. Use for drag racing estimates or performance comparison.
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Visualization
How It Works
The quarter mile (1,320 feet) is the standard drag racing distance. ET (elapsed time) is calculated using the Roger Huntington formula: ET = 5.825 * (weight/HP)^(1/3). Trap speed (MPH at the finish line) indicates raw power, while ET reflects launch, traction, and shifting. Adding 100 HP to a 300 HP car improves ET more than adding 100 HP to a 600 HP car — diminishing returns apply. Include driver weight (about 170 lbs) for accuracy.