FTP Zones Calculator
Calculate your seven power training zones based on Functional Threshold Power (FTP). Used by coaches worldwide for structured training.
Results
Visualization
How It Works
The FTP Zones Calculator divides your cycling power output into seven distinct training zones based on your Functional Threshold Power (FTP), helping you structure workouts at the right intensity for specific adaptations. By understanding these zones, cyclists can train more effectively, avoid overtraining, and build fitness systematically using the same methodology trusted by professional coaches and cycling teams worldwide.
The Formula
Variables
- FTP — Functional Threshold Power measured in watts — the maximum power you can sustain for approximately one hour. This is the foundation for all zone calculations.
- Body Weight — Your body weight in kilograms — used to calculate watts per kilogram (W/kg), which shows relative power output independent of body mass.
- Zone 1 (Active Recovery) — Less than 55% of FTP — very easy riding to promote blood flow and recovery without significant stress.
- Zone 4 (Threshold) — 90-105% of FTP — the critical intensity at your aerobic threshold, targeting sustainable high-intensity effort.
- Zone 7 (Neuromuscular Power) — Greater than 180% of FTP — maximum effort sprints and power efforts lasting seconds, developing explosive strength.
Worked Example
Let's say you're a 70 kg cyclist with an FTP of 280 watts. Your Zone 4 (Threshold) range would be: 280 × 0.90 = 252 watts (lower bound) and 280 × 1.05 = 294 watts (upper bound). So your threshold zone spans 252-294 watts. Your Zone 2 (Endurance) would be 280 × 0.55 = 154 watts to 280 × 0.75 = 210 watts, suitable for long, steady rides. Your relative power is 280 ÷ 70 = 4.0 W/kg, which indicates a strong recreational or competitive amateur cyclist. When you do an interval workout, you'd target these specific zones — perhaps 3 × 5 minutes in Zone 4 (280-294 watts) with 3-minute recoveries in Zone 2 (154-210 watts).
Practical Tips
- Establish your accurate FTP through a proper test: either a 20-minute all-out effort (subtract 5%) or a ramp test protocol with a power meter, done in controlled conditions after a full recovery week.
- Use Zone 2 (Endurance) for the majority of training volume — research shows 80% of rides should be easy, building aerobic base and recovery capacity while preventing overtraining.
- Zone 4 (Threshold) workouts should be limited to 1-2 sessions per week; these are mentally and physically demanding and require adequate recovery between sessions.
- Re-test your FTP every 6-12 weeks during your competitive season, as power improvements shift all zone boundaries upward and require training plan adjustments.
- Track both absolute power (watts) and relative power (W/kg) — relative power matters more for climbing, while absolute power indicates total fitness; a 70 kg rider at 4.0 W/kg has different training needs than an 85 kg rider at the same threshold.
Frequently Asked Questions
How do I accurately measure my FTP without a power meter?
You can estimate FTP using a 20-minute maximum effort on a stationary trainer or flat road, then multiply the average power by 0.95 to account for the fact that you could sustain slightly higher power for a full hour. Alternatively, use heart rate zones if you know your lactate threshold heart rate, though power-based zones are significantly more accurate for structured training.
Why is Zone 2 called 'Endurance' if it feels easy?
Zone 2 (55-75% FTP) trains your aerobic system to burn fat efficiently, increase mitochondrial density, and improve capillary networks — all adaptations that enhance endurance without the central nervous system fatigue of harder efforts. Even though it feels easy, the physiological adaptations are profound and form the foundation for all higher-intensity training.
What's the difference between Zone 5a and Zone 5b, and when do I use them?
Zone 5a (105-120% FTP) trains your VO2 max capacity with efforts typically lasting 3-8 minutes, while Zone 5b (120-150% FTP) develops anaerobic capacity with shorter, more intense efforts of 30 seconds to 2 minutes. Use Zone 5a for sustained high-intensity intervals and Zone 5b for shorter, explosive efforts to develop different energy systems.
Can body weight affect my training zones?
Body weight doesn't change your absolute power zones in watts, but it significantly affects relative power (W/kg). A heavier cyclist at the same FTP will have lower W/kg, making climbing harder; lighter cyclists will have higher W/kg but may lack absolute power for flat terrain. Train to your absolute power zones in watts, then use W/kg for context when comparing climbing performance.
How often should I do workouts in different zones?
A typical structured training week is 80% Zone 1-2 (recovery and endurance), 10% Zone 3 (tempo), and 10% Zones 4-7 (threshold and high intensity). However, elite athletes and those doing peak training might allocate more to high-intensity zones; always prioritize adequate recovery, and adjust zone distribution based on your competition schedule and training phase.
Sources
- TrainingPeaks: Understanding Power Zones
- Coggan, A. R., & Saucedo Bosadas, P. (2018). Power-based training
- USA Cycling Coaching Manual — Training Zones and Intensity Distribution
- Strava: FTP Testing Guidelines and Zone Calculation
- International Society of Sports Nutrition — Periodization and Training Intensity