Quarter Mile Calculator

A Quarter Mile Calculator helps estimate a vehicle's quarter-mile performance based on factors such as horsepower, vehicle weight, traction, and drivetrain efficiency. It predicts two key drag racing metrics: Elapsed Time (ET) and Trap Speed.

The quarter mile, equal to 1,320 feet (402.34 metres), is one of the most widely used benchmarks for measuring vehicle acceleration and overall performance. Racers, enthusiasts, and tuners use quarter-mile calculations to compare vehicles, evaluate modifications, and estimate race results without visiting a drag strip.

Power can be converted: 1 HP = 745.7 W, 1 kW = 1000 W

 Huntington Equation:

• ET = 6.269 × (Weight/Power)^(1/3) 
• Trap Speed = 234 × (Power/Weight)^(1/3) 
  Conservative estimate, good for street cars

Fox Equation:

• ET = 6.240 × (Weight/Power)^(1/3) 
• Trap Speed = 234 × (Power/Weight)^(⅓)
  Common standard for modern performance vehicles

Hale Equation:

• ET = 5.825 × (Weight/Power)^(1/3) 
• Trap Speed = 217.9 × (Power/Weight)^(1/3) 
  More aggressive, often used for race cars