1. What is HP to Weight Ratio?

Definition: This calculator determines the power-to-weight ratio by dividing the engine's horsepower by the vehicle's weight.

Purpose: It helps automotive enthusiasts and engineers evaluate a vehicle's performance potential.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \text{HP/W} \) — Horsepower 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 HP to Weight Ratio

Details: This ratio is a key performance metric in automotive design, racing, and vehicle comparison.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What's considered a good HP to weight ratio?
A: For street cars, 0.06-0.08 HP/lb is good. Performance cars achieve 0.10-0.15 HP/lb. Race cars can exceed 0.20 HP/lb.

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

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

Q4: Can I use this for motorcycles?
A: Yes, the calculation works the same for any vehicle. Motorcycles typically have excellent power-to-weight ratios.

Q5: What about metric units?
A: For metric (kW/kg), multiply HP by 0.7457 to get kW, and divide weight by 2.205 to get kg.