1. What is Power-to-Weight Ratio?

Definition: This calculator determines the power-to-weight ratio of a vehicle, which measures its performance potential.

Purpose: It helps car enthusiasts and engineers compare vehicle performance by showing how much power is available per unit of weight.

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: The engine's power output is divided by the vehicle's weight to determine how much power is available to move each pound of the vehicle.

3. Importance of Power-to-Weight Ratio

Details: A higher ratio indicates better acceleration and performance. This metric is crucial for comparing vehicles of different sizes and power outputs.

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: What's a good power-to-weight ratio?
A: For street cars, 0.05-0.08 HP/lb is good. Performance cars range 0.08-0.12 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 practical purposes, use gross weight (including passengers/cargo).

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

Q4: Can I use metric units?
A: The calculator uses HP and lb, but you can convert kW to HP (1 kW ≈ 1.34 HP) and kg to lb (1 kg ≈ 2.205 lb).

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