1. What is Power-to-Weight Ratio?

Definition: This calculator determines a vehicle's power-to-weight ratio by dividing its horsepower by its weight in pounds.

Purpose: It helps automotive enthusiasts and engineers compare vehicle performance potential, as a higher ratio generally means better acceleration.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

Explanation: The ratio shows how much power is available to move each pound of vehicle weight, directly affecting acceleration performance.

3. Importance of Power-to-Weight Ratio

Details: This ratio is a key performance metric in automotive engineering, racing, and vehicle comparison. Higher ratios typically mean faster acceleration.

4. Using the Calculator

Tips: Enter the vehicle's horsepower and weight in pounds. Both values must be > 0. The result shows horsepower per pound (HP/lb).

5. Frequently Asked Questions (FAQ)

Q1: What's a good power-to-weight ratio?
A: For street cars, 0.06-0.10 HP/lb is good. Performance cars exceed 0.10 HP/lb, while race cars often exceed 0.20 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 0-60 mph times?
A: Generally, higher power-to-weight ratios result in faster acceleration, but traction, gearing, and drivetrain also affect times.

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

Q5: Why is power-to-weight more important than raw horsepower?
A: A lighter car with less power can outperform a heavier car with more power if it has a better power-to-weight ratio.