1. What is Power-to-Weight Ratio?

Definition: The power-to-weight ratio measures a vehicle's performance by comparing its horsepower to its weight.

Purpose: It helps evaluate a car's acceleration potential and overall performance capability.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \text{HP/W} \) — Power-to-weight ratio (HP per pound)
• \( \text{HP} \) — Engine horsepower
• \( \text{W} \) — Vehicle weight in pounds

Explanation: Higher ratios indicate better performance potential as the vehicle has more power relative to its weight.

3. Importance of Power-to-Weight Ratio

Details: This ratio is crucial for comparing vehicle performance, especially in racing and high-performance applications.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What's a good power-to-weight ratio?
A: For street cars, 0.06-0.08 HP/lb is good, while performance cars exceed 0.10 HP/lb. Race cars often exceed 0.15 HP/lb.

Q2: Should I use curb weight or gross weight?
A: For performance comparisons, use curb weight (empty vehicle weight). For load capacity calculations, use gross weight.

Q3: How does this relate to acceleration?
A: Higher ratios generally mean better acceleration, though traction, gearing, and aerodynamics also play roles.

Q4: Can I use metric units?
A: This calculator uses HP and lb. For metric (kW/kg), multiply HP by 0.7457 for kW and divide lb by 2.205 for kg.

Q5: Why is this ratio important for electric vehicles?
A: EVs often have different torque curves, but the ratio still indicates potential performance relative to weight.