1. What is a Horsepower to ET Calculator?

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

Purpose: It helps automotive enthusiasts and racers predict 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 the relationship between power-to-weight ratio and acceleration over a quarter-mile distance.

3. Importance of ET Calculation

Details: Quarter-mile time is a standard performance metric in drag racing and helps compare vehicle acceleration capabilities.

4. Using the Calculator

Tips: Enter the vehicle weight in pounds and the engine horsepower. Both values must be > 0 for calculation.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this calculation?
A: It provides a theoretical estimate. Actual ET depends on traction, gearing, aerodynamics, and driver skill.

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

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

Q4: Can I use this for motorcycles?
A: Yes, but motorcycle ETs are typically faster due to better power-to-weight ratios.

Q5: What's a good quarter-mile time?
A: Below 14s is quick for street cars, below 12s is very fast, and below 10s is race car territory.