1. What is a Speed per Mile Calculator?

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

Purpose: It helps automotive enthusiasts and professionals predict vehicle performance in drag racing scenarios.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

Explanation: The formula calculates the power-to-weight ratio, takes its cube root, and scales it to estimate trap speed.

3. Importance of Speed Calculation

Details: Accurate speed estimation helps in vehicle tuning, performance comparisons, and predicting race outcomes.

4. Using the Calculator

Tips: Enter the vehicle's horsepower and weight in pounds. Both values must be greater than 0.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this calculation?
A: It provides a good estimate for most vehicles, but actual performance may vary based on traction, aerodynamics, and drivetrain efficiency.

Q2: Does this include driver weight?
A: No, the weight should include the vehicle plus driver and any cargo for most accurate results.

Q3: What's a good quarter-mile speed?
A: Street cars typically range 90-120 MPH, while professional dragsters can exceed 330 MPH.

Q4: Can I use this for motorcycles?
A: Yes, but motorcycles may achieve slightly higher speeds due to better power-to-weight ratios.

Q5: Why the cube root in the formula?
A: The cube root accounts for the non-linear relationship between power and speed due to increasing aerodynamic drag at higher velocities.