1. What is Power To Weight Ratio?

The Power To Weight Ratio (PWR) is a measurement of a vehicle's power output relative to its weight. It's a key indicator of a car's performance potential, with higher ratios generally indicating better acceleration and performance.

2. How Does the Calculator Work?

The calculator uses the simple formula:

Where:

• \( Power \) — Engine power in horsepower (hp)
• \( Weight \) — Vehicle weight in kilograms (kg)

Explanation: The ratio shows how much power is available to move each kilogram of the vehicle's mass.

3. Importance of PWR Calculation

Details: PWR is crucial for comparing vehicle performance potential. Higher PWR typically means better acceleration and hill-climbing ability, all else being equal.

4. Using the Calculator

Tips: Enter power in horsepower and weight in kilograms. 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 road cars, 0.06 hp/kg is decent, 0.1 hp/kg is sporty, and over 0.15 hp/kg is high-performance. Race cars often exceed 0.3 hp/kg.

Q2: How does PWR affect performance?
A: Higher PWR generally means better acceleration and higher top speed, though aerodynamics and gearing also play important roles.

Q3: Should I use metric or imperial units?
A: This calculator uses metric units (hp and kg), which is standard for PWR calculations in most countries.

Q4: Does PWR account for drivetrain losses?
A: No, PWR uses engine power figures. For wheel power figures, you would need to account for drivetrain losses (typically 10-15%).

Q5: How can I improve my car's PWR?
A: Either increase power (engine modifications) or decrease weight (lightweight components, removing unnecessary items).