1. What is Horsepower to MPH Conversion?

Definition: This calculator estimates a vehicle's 1/4-mile trap speed based on its horsepower and weight.

Purpose: It helps automotive enthusiasts and professionals estimate performance potential without track testing.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( MPH \) — Estimated 1/4-mile trap speed (miles per hour)
• \( HP \) — Engine horsepower
• \( W \) — Vehicle weight (pounds)

Explanation: The formula calculates the cube root of the power-to-weight ratio and scales it to typical trap speeds.

3. Importance of Power-to-Weight Ratio

Details: This calculation shows how both increasing power and reducing weight can improve performance, though with diminishing returns.

4. Using the Calculator

Tips: Enter the engine's horsepower and the vehicle's total weight including driver and fuel. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this estimate?
A: It provides a reasonable estimate for rear-wheel-drive vehicles with good traction. Actual results vary with traction, aerodynamics, and drivetrain.

Q2: Does this work for electric vehicles?
A: Yes, but EV torque characteristics may produce different results than the formula predicts.

Q3: Should I use wheel horsepower or crank horsepower?
A: For most accuracy, use wheel horsepower (measured at the wheels after drivetrain loss).

Q4: Why the cube root relationship?
A: Aerodynamic drag increases with the square of speed while power needed increases with the cube of speed.

Q5: What's a good trap speed?
A: Street cars typically run 90-110 mph, while performance cars range 110-130+ mph. Top dragsters exceed 330 mph.