1. What is Functional Threshold Power (FTP)?

Functional Threshold Power (FTP) represents the highest average power output (in watts) a cyclist can sustain for approximately one hour. It's a crucial metric for training and performance assessment in cycling.

2. How Does the Calculator Work?

The calculator estimates FTP based on different test durations:

Where:

• \( P_{avg} \) — Average power during the test (watts)
• Duration Factor — 1.0 for 60-minute test, 0.95 for 20-minute test, 0.90 for 8-minute test

Explanation: Since most cyclists can't sustain a true 60-minute maximal effort, shorter tests with adjustment factors are commonly used to estimate FTP.

3. Importance of FTP Calculation

Details: FTP is used to establish training zones, track fitness progress, and guide race pacing strategies. It's a key metric in power-based training programs.

4. Using the Calculator

Tips:

• Perform the test after proper warm-up
• Choose a flat, consistent course or use a stationary trainer
• Maintain consistent effort throughout the test duration
• Enter your average power and select the test duration used

5. Frequently Asked Questions (FAQ)

Q1: Why estimate FTP from shorter tests?
A: A true 60-minute maximal effort is extremely challenging. Shorter tests with adjustment factors provide a practical alternative.

Q2: What are typical FTP values?
A: FTP varies widely. Untrained cyclists might have 100-150W, while elite riders can exceed 400W. More important than absolute value is watts per kilogram (W/kg).

Q3: How often should I test my FTP?
A: Every 4-8 weeks is common during training seasons. Testing too frequently can interfere with training progress.

Q4: Does FTP change with fitness level?
A: Yes, FTP should increase with proper training and decrease with detraining or overtraining.

Q5: What's the difference between FTP and Critical Power?
A: FTP is a practical field test measurement, while Critical Power is a more theoretical parameter derived from multiple power-duration tests.