1. What is Power-to-Weight Ratio?

The power-to-weight ratio (W/kg) is a key performance metric in cycling that measures a rider's power output relative to their body weight. It's particularly important for climbing performance where gravity plays a significant role.

2. How Does the Calculator Work?

The calculator uses the simple formula:

Where:

• \( P \) — Power output in watts (W)
• \( m \) — Mass in kilograms (kg)

Explanation: This ratio shows how many watts of power a cyclist can produce for each kilogram of their body weight.

3. Importance in Cycling

Details: Power-to-weight ratio is crucial for:

• Assessing climbing performance
• Comparing cyclists of different sizes
• Tracking fitness improvements
• Setting training zones

4. Using the Calculator

Tips:

• Measure power using a power meter or smart trainer
• Use accurate body weight measurement
• For best comparisons, measure under similar conditions (fasted morning weight, etc.)

5. Frequently Asked Questions (FAQ)

Q1: What is a good W/kg for amateur cyclists?
A: 2.5 W/kg is decent, 3.5 W/kg is good, and 4.5+ W/kg is excellent for amateur male cyclists. Subtract ~0.5 W/kg for female cyclists.

Q2: How does W/kg affect climbing speed?
A: On a 7% grade, each additional 0.5 W/kg typically improves climbing speed by about 1 km/h.

Q3: Should I focus on increasing power or losing weight?
A: Both help, but the optimal approach depends on your current body composition and fitness level.

Q4: How long can different W/kg be sustained?
A: World-class cyclists can sustain 6+ W/kg for 30+ minutes, while amateurs might manage 3 W/kg for similar durations.

Q5: Does this account for bike weight?
A: No, this is rider-only W/kg. For total system W/kg, include bike weight in the mass calculation.