Quarter-Mile Time & Trap Speed
Estimate quarter-mile elapsed time and trap speed from vehicle weight and horsepower, free online.
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Classic estimates: ET ≈ 6.290 × (weight ÷ hp)^(1/3) seconds and trap speed ≈ 224 × (hp ÷ weight)^(1/3) mph, with weight in pounds including driver and hp at the flywheel. Traction, gearing and launch technique change real results by a few tenths.