1. What is Horsepower to MPH Calculator?

Definition: This calculator estimates a vehicle's 1/4-mile trap speed (MPH) 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 power-to-weight ratio and applies a cubic root function to estimate speed.

3. Importance of Power-to-Weight Ratio

Details: The power-to-weight ratio is crucial in vehicle performance. Higher ratios generally mean better acceleration and higher top speeds.

4. Using the Calculator

Tips: Enter the engine horsepower and total vehicle 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 approximation, but actual performance depends on traction, gearing, aerodynamics, and other factors.

Q2: Should I use wheel horsepower or crank horsepower?
A: For most accurate results, use wheel horsepower (measured at the wheels).

Q3: Does this include driver weight?
A: No, you must include the driver's weight in the total vehicle weight.

Q4: Why the cubic root function?
A: The relationship between power and speed isn't linear - doubling power doesn't double speed due to increasing aerodynamic drag.

Q5: What's a good MPH for street cars?
A: Most street cars run 90-110 MPH, while performance cars can exceed 120 MPH in the quarter mile.