1. What is HP to Weight Ratio?

Definition: The horsepower-to-weight ratio measures a vehicle's power relative to its weight, indicating potential acceleration and performance.

Purpose: This metric helps compare performance potential across different vehicles, regardless of their absolute power or size.

2. Understanding the Ratio

The calculator uses the formula:

Where:

• HP — Engine horsepower (at the crank or wheels)
• Weight — Vehicle curb weight in pounds
• Ratio — Horsepower per pound of weight

Performance Threshold: Vehicles with ratios >0.1 HP/lb are generally considered high-performance.

3. Why HP/Weight Matters

Performance Impact: Higher ratios typically mean better acceleration, as less weight must be moved by each unit of power.

Comparison Tool: Allows meaningful comparison between vehicles of different sizes and configurations.

4. Using the Calculator

Tips: Enter the vehicle's horsepower and curb weight (including fluids and standard equipment). The calculator will show the ratio and performance classification.

5. Frequently Asked Questions (FAQ)

Q1: What's considered a good HP/weight ratio?
A: Above 0.1 HP/lb is excellent (supercar territory), 0.06-0.1 is sporty, below 0.06 is average.

Q2: Should I use crank HP or wheel HP?
A: Crank HP is standard for manufacturer specs, but wheel HP (after drivetrain loss) gives "real" performance.

Q3: How does this relate to 0-60 times?
A: While not the only factor, HP/weight ratio strongly correlates with acceleration performance.

Q4: What are some high ratio production cars?
A: Examples include Koenigsegg Jesko (0.23 HP/lb), Ferrari SF90 Stradale (0.18 HP/lb), Porsche 911 Turbo S (0.13 HP/lb).

Q5: Does this account for torque or gearing?
A: No, this is a simplified metric. Torque curve and transmission also significantly impact performance.