1. What is Critical Power (CP)?

Critical Power represents the highest average power output a cyclist can sustain for an extended period without fatigue. It's a key metric for endurance performance and training zone determination.

2. How Does the Calculator Work?

The calculator uses the basic Critical Power equation:

Where:

• \( CP \) — Critical Power (watts)
• \( P_{avg} \) — Average sustainable power output (watts)

Explanation: This simple model calculates CP as the average power you can sustain over a defined period. More advanced models may use multiple power-duration data points.

3. Importance of Critical Power

Details: Critical Power helps athletes establish training zones, predict performance, and monitor fitness changes. It represents the boundary between sustainable and unsustainable exercise intensities.

4. Using the Calculator

Tips: Enter your average power output in watts from a sustained effort (typically 20-60 minutes). The value should be from a maximal, steady-state effort.

5. Frequently Asked Questions (FAQ)

Q1: How long should the effort be to calculate CP?
A: Traditional CP tests use efforts between 20-60 minutes. Shorter efforts may overestimate true CP.

Q2: What's the difference between CP and FTP?
A: Functional Threshold Power (FTP) is similar but typically measured over 60 minutes, while CP is theoretically sustainable indefinitely (though practically 30-60 minutes).

Q3: How often should I test my CP?
A: Every 4-6 weeks to track progress, but avoid testing too frequently as it requires maximal efforts.

Q4: Does CP vary by sport?
A: Yes, CP is sport-specific. Cycling CP will differ from running critical power (speed).

Q5: Can I use race data to estimate CP?
A: Yes, power data from time trials or sustained race segments can provide good CP estimates if effort was maximal and steady.