1. What is a HP to 1/4 Mile Calculator?

Definition: This calculator estimates a vehicle's quarter-mile elapsed time based on its weight and engine horsepower.

Purpose: It helps automotive enthusiasts and professionals estimate drag racing performance without actual track testing.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

Explanation: The formula approximates how weight-to-power ratio affects acceleration and top speed over a quarter-mile distance.

3. Importance of 1/4 Mile Time Calculation

Details: Quarter-mile time is a standard performance metric that helps compare vehicles and evaluate modifications.

4. Using the Calculator

Tips: Enter vehicle weight in pounds and engine horsepower. Both values must be > 0. The result is an estimate - actual performance may vary.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this calculator?
A: It provides a reasonable estimate for stock vehicles. Actual times vary based on traction, gearing, aerodynamics, and driver skill.

Q2: Should I use curb weight or gross weight?
A: For best results, use actual race weight including driver and fuel (gross weight).

Q3: Does this account for drivetrain loss?
A: No, use wheel horsepower (measured at the wheels) for most accurate results.

Q4: What's a good 1/4 mile time?
A: Times vary by vehicle type: 12-13s for performance cars, 14-15s for sports cars, 16-18s for average passenger cars.

Q5: Can I calculate trap speed with this?
A: No, this only calculates elapsed time. Trap speed requires additional calculations.