1. What is Functional Threshold Power (FTP)?

Functional Threshold Power (FTP) represents the highest average power output you can sustain for approximately one hour. It's a crucial metric for cyclists to measure fitness and set training zones.

2. How Does the Calculator Work?

The calculator uses the standard FTP formula:

Where:

• \( FTP \) — Functional Threshold Power in watts
• \( 20min\_power \) — Your average power output over 20 minutes
• \( 0.95 \) — Conversion factor to estimate 60-minute power from 20-minute power

Explanation: The 0.95 multiplier accounts for the fact that most cyclists can sustain about 95% of their 20-minute power for a full hour.

3. Importance of FTP Calculation

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

4. Using the Calculator

Tips: Enter your best 20-minute average power in watts. The value should be from a maximal, all-out 20-minute effort for accurate results.

5. Frequently Asked Questions (FAQ)

Q1: How often should I test my FTP?
A: Most cyclists test every 4-8 weeks to track progress. Testing too frequently can interfere with training.

Q2: What's a good FTP value?
A: FTP varies widely. Beginner cyclists might have FTPs of 150-200 watts, while professionals often exceed 400 watts.

Q3: Should I use 20-minute or 60-minute FTP tests?
A: The 20-minute test is more practical for most riders. Only experienced cyclists should attempt full 60-minute tests.

Q4: Does weight affect FTP?
A: Absolute FTP (in watts) doesn't account for weight. For comparison between riders, watts per kilogram (w/kg) is often used.

Q5: Can I use indoor trainer data for FTP tests?
A: Yes, indoor tests can be very accurate if done properly with consistent equipment and conditions.