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Power-to-Weight Ratio Formula:
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The power-to-weight ratio is a key performance metric in cycling that measures a rider's power output relative to their body weight. It's expressed in watts per kilogram (W/kg) and is a strong predictor of cycling performance, especially on climbs.
The calculator uses the power-to-weight ratio formula:
Where:
Explanation: The formula simply divides the rider's power output (in watts) by their body weight (in kilograms) to determine how many watts they can produce per kilogram of body weight.
Details: This ratio is particularly important in hill climbing, where gravity is the dominant resistance. Higher ratios mean better climbing performance. Competitive cyclists often track this metric to gauge fitness improvements.
Tips: Enter your power output (from a power meter) in watts and your weight in kilograms. For accurate results, measure power during a steady effort and use your current body weight.
Q1: What is a good power-to-weight ratio?
A: For recreational cyclists, 2-3 W/kg is typical. Competitive cyclists may achieve 4-5 W/kg, and elite riders can reach 6+ W/kg for short durations.
Q2: How does this differ from absolute power?
A: Absolute power (watts) matters on flats, while power-to-weight ratio is crucial for climbing. A lighter rider with lower absolute power can outperform a heavier rider with higher power on climbs.
Q3: Should I focus on increasing power or losing weight?
A: Both strategies improve your ratio, but the optimal approach depends on your current fitness and body composition. Consult a coach for personalized advice.
Q4: How long can different ratios be sustained?
A: World-class cyclists can sustain 6+ W/kg for 20-40 minutes, 5 W/kg for an hour, and 4 W/kg for several hours.
Q5: Does this apply to time trials or flat races?
A: On flat terrain, absolute power and aerodynamics become more important than power-to-weight ratio.