Cycling FTP Zone Calculator
Use this tool to convert your Functional Threshold Power (FTP) into practical training zones based on the classic 7-zone model.
If body weight is provided, the calculator also shows W/kg for each zone.
What is FTP and why does it matter?
FTP stands for Functional Threshold Power, often described as the highest average power you can maintain for roughly one hour of hard effort. In real-world training, FTP acts like a personal anchor: once you know it, you can prescribe workouts that are specific, measurable, and repeatable.
Instead of saying “ride hard today,” you can say “ride 3x12 minutes at Zone 4.” That precision helps with progression, recovery, and consistency across weeks and months.
How FTP zones are used in training
Most cyclists use power zones to match the day’s goal with the right physiological stress. Easy rides build aerobic durability, while higher zones improve threshold, VO2 max, and anaerobic power.
Classic 7-zone power model
- Zone 1 (Active Recovery): Very easy spinning to promote blood flow and recovery.
- Zone 2 (Endurance): Aerobic base work for long rides and metabolic efficiency.
- Zone 3 (Tempo): Moderately hard “all-day uncomfortable” effort.
- Zone 4 (Threshold): Race-relevant sustained efforts near FTP.
- Zone 5 (VO2 Max): High-intensity work to improve oxygen uptake and aerobic ceiling.
- Zone 6 (Anaerobic Capacity): Short, very hard intervals above VO2 range.
- Zone 7 (Neuromuscular): Sprints and maximal accelerations.
How to estimate your FTP
There are several common methods. Pick one that matches your equipment, fitness, and tolerance for testing.
1) 20-minute test
After a structured warm-up, ride as hard as possible for 20 minutes. A common estimate is:
FTP ≈ 95% of your 20-minute average power
2) Ramp test
Power increases every minute until failure. Software platforms convert your peak minute into an FTP estimate. This method is quick and repeatable but can overestimate or underestimate for some riders depending on phenotype.
3) Race and training data analysis
If you ride with a power meter regularly, your FTP can be inferred from best efforts over multiple durations. This often gives the most realistic day-to-day value when combined with coach feedback.
How to train with your zones
A useful weekly structure balances intensity and recovery. One common approach is:
- 1-2 quality workouts in Zones 4-6
- 1 long endurance ride in Zone 2
- Additional easy Zone 1-2 volume as schedule allows
Sample workout ideas by zone
- Zone 2: 90-180 minutes steady endurance
- Zone 3: 2x20 minutes tempo with 5-8 minutes easy between
- Zone 4: 3x10 to 4x12 minutes threshold with equal recovery
- Zone 5: 5x3 minutes hard with 3 minutes easy
- Zone 6: 8x30 seconds all-out with full recovery
Common FTP mistakes to avoid
- Using stale numbers: Re-test every 6-10 weeks or after major fitness changes.
- Riding every day too hard: Too much time in mid/high zones can stall progress.
- Ignoring fatigue: Sleep, nutrition, and stress affect power output.
- Treating FTP as identity: It is a training metric, not a personal value judgment.
When to update your zones
Update your training zones when:
- Your threshold workouts become noticeably easier at the same power.
- You complete intervals with lower heart rate and perceived exertion than usual.
- You have fresh testing data from a race, lab, or field test.
As a rule, small adjustments (for example, +5 to +10 watts) are often better than dramatic jumps unless supported by strong evidence.
Final thoughts
An FTP zone calculator is simple, but it can significantly improve training quality. The key is consistency: use your zones, review your rides, and adjust based on performance trends. Over time, disciplined zone-based training leads to better endurance, stronger race efforts, and smarter recovery.