Home
Back
Quarter Mile ET Equation:
| From: | To: |
The Quarter Mile ET (Elapsed Time) equation estimates the time it takes for a vehicle to complete a quarter mile (402 meters) drag race based on its horsepower and weight. This formula provides a theoretical estimation of vehicle acceleration performance.
The calculator uses the Quarter Mile ET equation:
Where:
Explanation: The equation calculates the cube root of the power-to-weight ratio and divides 1353 by this value to estimate quarter mile time. Lower ET values indicate better acceleration performance.
Details: The power-to-weight ratio (HP/Weight) is a critical factor in vehicle performance. Higher ratios result in better acceleration and lower quarter mile times. This calculation helps enthusiasts and racers estimate vehicle performance potential.
Tips: Enter horsepower and weight in pounds. Both values must be positive numbers. The calculator provides an estimated quarter mile elapsed time in seconds.
Q1: How accurate is this calculation?
A: This provides a theoretical estimate. Actual performance depends on traction, transmission, aerodynamics, driver skill, and other factors.
Q2: What is a good quarter mile time?
A: For production cars, 12-14 seconds is considered quick, 10-12 seconds is very fast, and under 10 seconds is exceptional performance.
Q3: Does this account for drivetrain loss?
A: No, this calculation uses engine horsepower. For wheel horsepower, results will be slightly slower than calculated.
Q4: Can I use metric units?
A: The formula is designed for horsepower and pounds. Convert metric units before calculation (1 kW = 1.341 HP, 1 kg = 2.205 lb).
Q5: Why use the cube root in the formula?
A: The cube root relationship accounts for the non-linear acceleration characteristics as speed increases due to aerodynamic drag and transmission gearing.