1. What is Horsepower per Pound?

Definition: This calculator determines the power-to-weight ratio by dividing horsepower by weight in pounds.

Purpose: It helps evaluate engine or motor efficiency, particularly in automotive and aerospace applications where power-to-weight ratio is critical.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \text{HP/W} \) — Horsepower per pound (HP/lb)
• \( \text{HP} \) — Total horsepower
• \( \text{W} \) — Total weight in pounds

Explanation: The formula simply divides the power output by the weight to determine how much power is available per unit of weight.

3. Importance of Power-to-Weight Ratio

Details: A higher HP/lb ratio indicates better performance potential, as the vehicle or machine can accelerate faster and handle better.

4. Using the Calculator

Tips: Enter the horsepower and weight in pounds. Both values must be greater than 0.

5. Frequently Asked Questions (FAQ)

Q1: What's a good HP/lb ratio for cars?
A: Sports cars typically range 0.06-0.10 HP/lb, while supercars can exceed 0.15 HP/lb.

Q2: How does this compare to kW/kg?
A: 1 HP/lb ≈ 1.64 kW/kg. To convert, multiply HP/lb by 1.64.

Q3: Should I use curb weight or gross weight?
A: For performance comparisons, use curb weight (vehicle weight without passengers or cargo).

Q4: What vehicles have the highest HP/lb ratios?
A: Formula 1 cars (~0.5 HP/lb) and some motorcycles exceed 0.3 HP/lb.

Q5: Does this account for drivetrain losses?
A: No, this uses engine horsepower. For wheel horsepower, use dyno measurements.