What FTP Means (and Why W/kg Matters More Than Watts)
Functional Threshold Power (FTP) is defined as the highest average power output you can sustain for approximately 60 minutes. It represents your lactate threshold — the boundary between aerobic and anaerobic metabolism.
Why watts per kilogram (W/kg) rather than absolute watts:
Because cycling involves moving body weight uphill and through air resistance, a 60kg rider with a 240W FTP (4.0 W/kg) climbs faster than an 80kg rider with the same 240W FTP (3.0 W/kg). On flat terrain, absolute watts matter more. On any significant gradient, W/kg determines pace.
FTP in context:
| FTP (W/kg) | Absolute FTP at 70kg | Absolute FTP at 80kg | Context |
|---|---|---|---|
| 2.0 W/kg | 140W | 160W | Beginner / first year cyclist |
| 2.5 W/kg | 175W | 200W | Recreational, regular riding |
| 3.0 W/kg | 210W | 240W | Trained, Cat 4–5 race fitness |
| 3.5 W/kg | 245W | 280W | Competitive amateur, Cat 3 |
| 4.0 W/kg | 280W | 320W | Serious amateur, Cat 2–3 |
| 4.5 W/kg | 315W | 360W | Cat 1 / Elite amateur |
| 5.0 W/kg | 350W | 400W | Professional / National-level |
| 5.5 W/kg | 385W | 440W | WorldTour domestique level |
| 6.0+ W/kg | 420W+ | 480W+ | Tour de France GC contenders |
Coggan Power Profiling: Full W/kg Classification
Andy Coggan's power profiling system (widely adopted in cycling coaching) classifies riders by the best 5-second, 1-minute, 5-minute, and 60-minute (FTP) power relative to body weight:
| Category | FTP (W/kg) men | FTP (W/kg) women | Description |
|---|---|---|---|
| Untrained | <2.0 | <1.8 | No structured training |
| Fair | 2.0–2.5 | 1.8–2.2 | Beginning regular cycling |
| Fitness | 2.5–3.0 | 2.2–2.7 | Regular riding, some intervals |
| Sportif | 3.0–3.5 | 2.7–3.2 | Strong club rider, Cat 4–5 |
| Trained | 3.5–4.0 | 3.2–3.7 | Cat 3–4, competitive amateur |
| Domestic Elite | 4.0–4.5 | 3.7–4.2 | Cat 1–2, national-level amateur |
| International | 4.5–5.0 | 4.2–4.7 | Professional continental level |
| World Class | 5.0–5.7 | 4.7–5.4 | WorldTour professional |
| Exceptional | >5.7 | >5.4 | GC Tour de France contenders |
Record FTP Values in Context
| Athlete | Estimated FTP | W/kg (race weight) |
|---|---|---|
| Chris Froome (2015 Tour) | ~420W | ~6.1–6.2 W/kg |
| Tadej Pogačar (2021) | ~430–440W | ~6.4–6.7 W/kg |
| Anna van der Breggen (2020) | ~310–320W | ~5.4–5.6 W/kg |
| Strong Cat 3 amateur (75kg) | ~255–285W | ~3.4–3.8 W/kg |
The FTP Test Protocol (Step by Step)
The most widely used FTP test:
Equipment: Power meter or smart turbo trainer (without power, the test is not meaningful)
Protocol: 1. 10-minute easy warm-up (Z1–Z2) 2. 3×1 minute at ~120% of estimated FTP, 1 minute recovery between 3. 5 minutes easy recovery 4. 20-minute all-out effort (aim for as even a pace as possible) 5. 10 minutes easy cool-down
FTP calculation: Average power from the 20-minute effort × 0.95 = FTP
The 0.95 factor corrects for the fact that 20-minute best power is typically 5% higher than true 60-minute threshold power, because the aerobic system can sustain higher intensity for 20 minutes than 60.
The 7 Power Training Zones Based on FTP
| Zone | Name | % of FTP | HR zone | Description |
|---|---|---|---|---|
| Z1 | Active Recovery | <55% | <68% HRmax | Easy spinning, recovery rides |
| Z2 | Endurance | 55–75% | 68–80% | Aerobic base, fat oxidation |
| Z3 | Tempo | 75–88% | 80–87% | Comfortably hard, just below threshold |
| Z4 | Sweetspot | 88–95% | 87–92% | Most bang for training buck |
| Z4+ | Threshold | 95–105% | 92–96% | At or slightly above FTP |
| Z5 | VO₂max | 105–120% | 96–100% | 5–8 minute intervals, hard |
| Z6 | Anaerobic | >120% | Max | 30s–2min all-out efforts |
Training to Improve FTP
The most efficient protocols for FTP improvement (ranked by time-efficiency):
| Protocol | Zone | Duration per session | Frequency | FTP gain (12 weeks) |
|---|---|---|---|---|
| Sweetspot intervals | Z4 (88–93%) | 2–3 × 20 min | 2–3×/week | +6–10% |
| Threshold intervals | Z4+ (95–100%) | 4–6 × 8 min | 2×/week | +5–8% |
| Short VO₂max intervals | Z5 (105–120%) | 4–6 × 4 min | 2×/week | +4–7% |
| High-volume Z2 alone | Z2 (55–75%) | 12–15h/week | Daily | +3–5% |
Peaking for a Target Event: The Taper Effect on FTP
A properly executed taper (reducing training volume by 40–60% for 10–14 days before a target event) typically produces a 2–3% FTP increase measured on race day. Research by Bosquet et al. (2007) found that this magnitude of volume reduction while maintaining intensity specificity is the optimal formula for performance peaks.
For FTP-based events (gran fondos, time trials, climbs), this means your "race day FTP" is measurably higher than your training FTP — account for this when setting race power targets.