1. What is Watts Per Kilogram (W/kg)?

Definition: W/kg is a measurement of power-to-weight ratio, calculated by dividing power output (in watts) by weight (in kilograms).

Purpose: It's commonly used in cycling and other sports to compare athletes' performance potential and in engineering to evaluate power systems.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( W/kg \) — Power-to-weight ratio (watts per kilogram)
• \( Watts \) — Power output (watts)
• \( kg \) — Weight (kilograms)

Explanation: Higher values indicate greater power relative to body weight, which typically correlates with better performance in weight-sensitive activities.

3. Importance of Power-to-Weight Ratio

Details: This metric is crucial in cycling, aviation, and electric vehicle design where power must be balanced against weight for optimal performance.

4. Using the Calculator

Tips: Enter your power output in watts and weight in kilograms. Both values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's a good W/kg for cycling?
A: For amateur cyclists, 2-3 W/kg is decent, 3-4 W/kg is good, and 4+ W/kg is excellent. Pro cyclists often exceed 6 W/kg.

Q2: Does this include equipment weight?
A: Typically uses body weight only, but some applications may include equipment weight for system evaluations.

Q3: How do I measure my power output?
A: Use a power meter on your bike or other exercise equipment that measures power output.

Q4: Why is W/kg more important than raw watts?
A: It accounts for the fact that lighter individuals need less power to achieve the same performance as heavier individuals.

Q5: Can this be used for electric motors?
A: Yes, W/kg is commonly used to compare motor and battery system efficiency in EVs and other applications.