1. What is Power to Weight Ratio?

The Power to Weight Ratio (PWR) is a measurement of a vehicle's performance, calculated by dividing the power output by the weight of the vehicle. It's commonly expressed in horsepower per pound (hp/lb) and is particularly important for small vehicles where weight significantly impacts performance.

2. How Does the Calculator Work?

The calculator uses the simple PWR formula:

Where:

• \( HP \) — Horsepower (hp)
• \( Weight \) — Vehicle weight (lb)

Explanation: The ratio shows how much power is available for each unit of weight, directly affecting acceleration and performance.

3. Importance of PWR Calculation

Details: A higher PWR generally indicates better performance, as the vehicle has more power relative to its weight. This is crucial for comparing different vehicles or optimizing performance in racing applications.

4. Using the Calculator

Tips: Enter horsepower in hp and weight in pounds. Both values must be greater than zero for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: What is a good power to weight ratio?
A: For small vehicles, ratios above 0.1 hp/lb are considered good, while performance vehicles may exceed 0.2 hp/lb.

Q2: How does PWR affect vehicle performance?
A: Higher PWR typically means faster acceleration and better hill-climbing ability, all else being equal.

Q3: Should I use gross or net horsepower?
A: For most accurate results, use net horsepower (measured at the wheels) rather than gross engine horsepower.

Q4: Does this apply to electric vehicles?
A: Yes, though electric motors deliver power differently, the PWR concept remains valid for performance comparison.

Q5: How can I improve my vehicle's PWR?
A: Either increase horsepower (engine modifications) or reduce weight (lightweight components) to improve the ratio.