What is Functional Threshold Power (FTP)? - Threshold Cycling

What is Functional Threshold Power (FTP)? The Ultimate Guide (2026)

What is Functional Threshold Power (FTP)? The Ultimate Guide (2026)

Functional Threshold Power (FTP) is the single most important metric in modern endurance cycling. Defined as the highest average power output (in watts) a cyclist can sustain for approximately one hour, your FTP serves as the baseline for calculating training zones, pacing race efforts, and tracking fitness improvements over time.

1. How to Test & Calculate Your FTP

There are two primary protocols for measuring FTP using a reliable pedal-based power meter like the Favero Assioma PRO RS-2 connected to a Garmin Edge 1050 GPS Computer:

  • The Standard 20-Minute FTP Test: After a thorough warm-up, ride a 20-minute time trial effort at your maximum sustainable pace. Take your average wattage for the 20 minutes and multiply by 0.95 to estimate your 60-minute FTP.
  • The Ramp Test: Conducted on a smart trainer or power meter, starting at a low wattage and increasing by 15–20 watts every minute until exhaustion. FTP is calculated as 75% of your final completed 1-minute wattage.

2. Watts Per Kilogram (W/kg): The Ultimate Power-to-Weight Benchmark

While raw FTP (e.g., 300 watts) indicates flat-road speed, climbing speed is determined by Watts per Kilogram (W/kg). Divide your FTP by your weight in kilograms (lbs / 2.205):

  • Untrained / Recreational: 2.0 – 2.75 W/kg
  • Moderate / Club Cyclist: 3.0 – 3.75 W/kg
  • Cat 1/2 Competitive Amateur: 4.0 – 4.75 W/kg
  • WorldTour Professional: 5.5 – 6.5+ W/kg

Equip your cockpit with precision tracking tools at the Power Meters Collection and GPS Cycling Computers Collection.

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Frequently Asked Questions

What are cycling power zones and why are they important?

Cycling power zones are specific intensity ranges based on percentages of your Functional Threshold Power (FTP). They're important because they provide a structured framework for training, allowing you to target precise physiological adaptations and train more efficiently.

How do I calculate my cycling power zones?

Threshold Cycling offers a free, easy to use training zone calculator to determine your cycling power zones instantly. No personal information required.

What's the difference between training with power zones and heart rate zones?

Power zones measure your actual output in watts, providing an objective and instantaneous measure of intensity. Heart rate zones, on the other hand, measure your body's physiological response to work, which can lag behind changes in intensity and be influenced by various factors like temperature and fatigue.

How do I calculate my Functional Threshold Power (FTP?)

You can determine your FTP through various methods, including a 20-minute FTP test, a ramp test, or critical power testing. The 20-minute test involves a maximal sustainable effort, with FTP calculated as 95% of your 20-minute average power.

Read our full article on FTP to really dive into the details!

How often should I update my power zones?

For beginners experiencing rapid fitness gains, retesting every 4-6 weeks is recommended. More advanced cyclists typically test less frequently, often aligning with their training cycles. As a general guideline, measure your FTP at least four times annually.