1. What is a 1/4 Mile Drag Race Calculator?

Definition: This calculator estimates the horsepower of a vehicle based on its weight and 1/4 mile elapsed time (ET).

Purpose: It helps racing enthusiasts and mechanics evaluate a vehicle's performance and power output.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( HP \) — Horsepower
• \( W \) — Vehicle weight (pounds)
• \( ET \) — Elapsed time for 1/4 mile (seconds)

Explanation: The formula relates vehicle weight to elapsed time through a cubic relationship, with 5.825 being an empirical constant.

3. Importance of 1/4 Mile Calculations

Details: 1/4 mile performance is a standard benchmark in drag racing, helping compare vehicles and evaluate modifications.

4. Using the Calculator

Tips: Enter the vehicle weight in pounds and the 1/4 mile elapsed time in seconds. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this calculation?
A: It provides a good estimate but actual horsepower may vary due to traction, aerodynamics, and drivetrain losses.

Q2: Should I use curb weight or race weight?
A: For most accurate results, use the vehicle's actual weight during the run (including driver and fuel).

Q3: What's a good 1/4 mile time?
A: Times vary by vehicle type, but sub-14 seconds is good for street cars, while dragsters can run under 6 seconds.

Q4: How does horsepower relate to ET?
A: Higher horsepower generally means lower ET, but the relationship is non-linear (cubic in this formula).

Q5: Can I use this for other distance races?
A: This formula is specifically calibrated for 1/4 mile. Different constants would be needed for other distances.