Quarter Mile Calculator
Calculate performance metrics for quarter-mile acceleration
Quarter mile testing is a standardized method for measuring vehicle acceleration performance. It involves:
- Accelerating from a standing start
- Measuring time to cover 1/4 mile (402.336 meters)
- Recording final speed at the finish line
- Calculating various performance metrics
This test is widely used in drag racing and automotive performance evaluation as a benchmark for comparing different vehicles.
Elapsed Time (ET)
The total time taken to cover the quarter mile, measured in seconds. This is the primary performance metric in drag racing.
Trap Speed
The vehicle's speed at the finish line, typically measured in miles per hour (mph). This indicates the vehicle's power output.
Average Acceleration
The mean acceleration over the quarter mile, calculated from the initial and final speeds.
Estimated Horsepower
An approximation of the vehicle's power output based on its performance data.
Vehicle Weight
Affects acceleration and power requirements. Lighter vehicles generally perform better, but weight distribution is also important.
Aerodynamics
The drag coefficient impacts high-speed performance. Lower drag means better top-end speed and improved times.
Power-to-Weight Ratio
The relationship between engine power and vehicle weight is crucial for acceleration performance.
Example 1: Sports Car
- Weight: 1500 kg
- Drag Coefficient: 0.30
- Quarter Mile Time: ~12.5 seconds
- Trap Speed: ~115 mph
- Estimated Horsepower: ~400 hp
Example 2: Muscle Car
- Weight: 1800 kg
- Drag Coefficient: 0.35
- Quarter Mile Time: ~11.2 seconds
- Trap Speed: ~125 mph
- Estimated Horsepower: ~550 hp
What is a good quarter mile time?
For street cars, anything under 13 seconds is considered quick. High-performance cars typically run in the 11-12 second range, while supercars can achieve sub-10 second times.
How accurate is the horsepower estimation?
The estimation is approximate and based on ideal conditions. Real world factors like temperature, altitude, and road conditions can affect actual performance.
What affects quarter mile times the most?
Power-to-weight ratio is the biggest factor, followed by traction, aerodynamics, and driver skill. Weather conditions and altitude also play significant roles.