All Tools
Drag ET & Horsepower
The classic quarter-mile relationships: weight + power predicts ET and trap speed, and a timeslip works backwards to horsepower. Useful for bench racing, realistic goal-setting and sandbagging detection.
kg
3,086 lb
whp
≈ 317 kW · crank ≈ 500 hp
s
mph
From 425 whp at 1,400 kg
Predicted ET
11.28 s
Predicted trap
120.8 mph
194 km/h
HP from your ET (11.5 s)
472 hp crank*
≈ 401 whp
HP from your trap (120 mph)
490 hp crank*
≈ 416 whp
*The formulas output WHEEL horsepower — we’ve divided by 0.85 to show a typical crank estimate. Trap speed is the honest number (it’s energy-based); ET is dominated by the first 60 ft, so a traction-limited car runs the ET of a much slower car at the same trap. Correct for air (density altitude tool above) before comparing hero runs from different days.
Good to know
- Formulas: ET = 5.825 × (weight/HP)^⅓ · trap = 234 × (HP/weight)^⅓ — the standard estimates used across drag racing.
- They assume sea level, good air and ideal traction. Correct for the day’s density altitude (see the density altitude tool) before comparing runs.
- Trap speed is an energy measurement and is honest; ET depends on the first 60 ft, so traction-limited cars run slow ETs at high trap speeds.
- Horsepower figures from timeslips are rear-wheel numbers — divide by ~0.85 for a rough crank figure (or multiply, depending on which way you’re converting).