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 higher ratios generally indicate 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 metric is crucial for comparing vehicle performance potential, as two cars with identical horsepower but different weights will have very different acceleration characteristics.

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 reference: Economy cars ~0.05 HP/lb, Sports cars ~0.10 HP/lb, Supercars ~0.20 HP/lb, F1 cars ~0.60 HP/lb.

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

Q3: How does this relate to 0-60 mph times?
A: Generally, higher ratios mean faster acceleration, but traction, gearing, and drivetrain also affect actual times.

Q4: Can I use metric units (kW and kg)?
A: This calculator uses HP and lb. For metric, divide kW by kg to get kW/kg ratio (1 HP/lb ≈ 1.64 kW/kg).

Q5: Why is my result so small?
A: HP/lb values are typically small decimals (e.g., 0.08). Multiply by 1000 to get HP per 1000 lb if preferred.