| Training zone | % FTP | Your range | Primary use |
|---|---|---|---|
| Z1 · Active recovery | <55% | 0–138 W | Easy circulation and recovery |
| Z2 · Endurance | 56–75% | 140–188 W | Aerobic base and fat oxidation |
| Z3 · Tempo | 76–90% | 190–225 W | Muscular endurance |
| Z4 · Threshold | 91–105% | 228–263 W | Sustainable high aerobic power |
| Z5 · VO₂ max | 106–120% | 265–300 W | Central aerobic capacity |
| Z6 · Anaerobic | 121–150% | 303–375 W | Short glycolytic efforts |
| Z7 · Neuromuscular | >150% | 378+ W | Maximal sprint power |
Power zones are starting bands, not physiological test results. Heat, fatigue, altitude, and indoor cooling can all move the power you can sustain on a given day.
How are these cycling power zones calculated?
Training zones convert your single Functional Threshold Power (FTP) value into specific target wattage ranges. Each zone targets distinct cardiovascular and metabolic adaptations:
- Coggan 7-Zone Model:The gold standard for power-based training. Divides intensity into Zone 1 Active Recovery (<55% FTP), Zone 2 Endurance (56–75%), Zone 3 Tempo (76–90%), Zone 4 Threshold (91–105%), Zone 5 VO₂max (106–120%), Zone 6 Anaerobic Capacity (121–150%), and Zone 7 Neuromuscular (>150%).
- British Cycling 6-Zone Model: Carves out a dedicated Sweet Spot zone (88–93% FTP) between Tempo and Threshold, designed for time-crunched riders building dense sub-threshold muscular endurance.
- Seiler 3-Zone Polarized Model:Rooted in Dr. Stephen Seiler's 80/20 research. Anchored to biological thresholds: Zone 1 Low Intensity (<LT1 / ~50–79% FTP), Zone 2 Moderate ("Gray Zone" between LT1 and LT2 / 80–99% FTP), and Zone 3 High Intensity (>LT2 / >100% FTP).
Why do percentage-based zones need field validation?
Fixed percentage models assume every cyclist shares identical lactate dynamics. In practice, individual physiology varies significantly:
Lactate Threshold Variance:Lab testing shows that an athlete's First Lactate Turnpoint (LT1 / aerobic threshold) can occur anywhere from 45% to 70% of maximum heart rate (55–75% FTP), while LT2 ranges from 55% to 93% HRmax.
To ensure your calculated Zone 2 is truly building aerobic base without accumulating excess fatigue, validate your numbers with two field checks:
- The Talk Test: On Zone 2 endurance rides, you should be able to speak in full, continuous sentences or breathe exclusively through your nose (RPE 3–4 out of 10). If breathing becomes forced, you have crossed LT1 into moderate intensity.
- Aerobic Drift (Decoupling) Test: Ride at steady calculated Zone 2 power for 60 to 90 minutes. If heart rate drifts upward by more than 5% while power stays constant, your target power sits above your aerobic threshold.
What does watts per kilogram (W/kg) measure?
Watts per kilogram divides your FTP by your body mass in kilograms (W/kg = FTP Watts / Weight in kg). It measures your power-to-weight ratio, which dictates performance when climbing steep gradients.
| Category Level | Typical Male FTP Range | Typical Female FTP Range | Primary Performance Focus |
|---|---|---|---|
| Recreational / Beginner | 2.0–2.5 W/kg | 1.5–2.0 W/kg | General fitness, initial aerobic base |
| Intermediate / Time-Crunched | 3.0–3.8 W/kg | 2.5–3.2 W/kg | Local group rides, century completion |
| Advanced / Competitive | 4.0–4.8 W/kg | 3.5–4.2 W/kg | Category 1/2 racing, gran fondo podiums |
| WorldTour Professional | 5.5–6.5+ W/kg | 4.8–5.5+ W/kg | Grand Tour mountain stages |
Flat vs. Climbing Performance: While W/kg governs steep climbs, absolute wattage and aerodynamic drag (CdA) govern speed on flat and rolling terrain. A 90kg rider producing 350W (3.88 W/kg) will easily outpace a 60kg rider producing 250W (4.16 W/kg) on flat roads.
Learn more about testing accuracy in our FTP Test Protocols Compared guide, or apply your calculated zones to a structured routine in our Cycling Training Plan Guide and Polarized vs. Sweet Spot Guide.
