1. What is a Quarter Mile Horsepower Calculator?

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

Purpose: It helps automotive enthusiasts and professionals evaluate vehicle performance and engine power.

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 Quarter Mile Calculations

Details: 1/4-mile performance is a standard benchmark for vehicle acceleration and power-to-weight ratio.

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 doesn't account for traction, aerodynamics, or drivetrain losses.

Q2: What's a good 1/4-mile time?
A: Street cars typically run 13-15 seconds, while performance cars can do 10-12 seconds.

Q3: Should I use curb weight or gross weight?
A: For accuracy, use the actual weight during the run including driver and fuel.

Q4: Does this calculate wheel or engine horsepower?
A: This estimates engine horsepower at the flywheel.

Q5: Why is weight so important in the calculation?
A: Power-to-weight ratio is critical for acceleration performance.