Quarter Mile Time Calculator
Quarter Mile Time
Estimate quarter-mile elapsed time and trap speed based on vehicle horsepower and weight for drag strip performance prediction.
Formula
Quarter Mile ET = 5.825 x (Weight / HP) ^ (1/3); Trap Speed = 234.24 x (HP / Weight) ^ (1/3); 1/8 Mile ET = Quarter Mile ET x 0.632
Frequently Asked Questions
What is the quarter mile ET formula?
The most common formula is the Roger Huntington equation: ET = 5.825 x (Weight/HP)^(1/3). This assumes reasonable traction and is accurate for most street vehicles.
How does altitude affect quarter mile time?
Naturally aspirated engines lose roughly 3 percent power per 1,000 feet of elevation. Turbocharged vehicles are less affected since the turbo compensates for thinner air.
What is a good quarter mile time?
A stock sports car typically runs 12 to 14 seconds, performance sedans 14 to 16 seconds, and economy cars 16 to 18 seconds. Under 10 seconds is professional drag racing territory.
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