Cycling Power Zones Calculator
Inputs
| How do you want to enter FTP? | I know my FTP |
|---|---|
| FTP (Functional Threshold Power) | 200 W |
| 20-minute average power | 210 W |
| Your current fitness level | Recreational fitness (~2.25 W/kg) |
| Body Weight | 70 kg |
Visualization
| Zone | % FTP (low) | % FTP (high) | Watts (low) | Watts (high) |
|---|---|---|---|---|
Cycling Power Zones Calculator
Find your FTP and the 7 Coggan power training zones. Enter FTP directly if you know it, derive it from a 20-minute test, or estimate it from your fitness level — no power meter required.
Inputs
Inputs
No power meter? Switch the method above to a 20-minute test or fitness-level estimate. You can refine the number later once you have a real measurement.
Results
Enter a value to see results.
FTP ... gives a power-to-weight ratio of .... Use the zone table to target each training intensity.
Training Zones
| Zone | % FTP (low) | % FTP (high) | Watts (low) | Watts (high) |
|---|---|---|---|---|
How FTP and power zones work
Structured cycling training revolves around one number: your Functional Threshold Power (FTP) — the highest average power output, in watts, you can sustain for approximately 60 minutes. Everything else — training zones, interval targets, race pacing — is expressed as a percentage of FTP. This calculator finds your FTP using whichever method matches what you have, then computes all seven Coggan power zones and your power-to-weight ratio.
What FTP measures
FTP is the boundary between aerobic and anaerobic effort — the point at which lactate begins accumulating in your muscles faster than it can be cleared. Below FTP, you can sustain effort indefinitely (given adequate fueling). Above it, the clock is running: fatigue accumulates and you will eventually need to slow down or stop.
A 30-year-old recreational cyclist might have an FTP of 180–240 W. A trained amateur racer might be 250–320 W. Elite professionals competing in Grand Tours typically exceed 380–420 W — often 5.5–6.5 W/kg.
The three input methods
Method 1: I know my FTP
If you have already done a formal FTP test on a smart trainer (Wahoo Kickr, Tacx Neo, Saris H3) or through a training app (Zwift, TrainerRoad, Garmin), enter the result directly. You can also use the result from a recent ramp test — these correlate well with standard FTP tests for most riders.
Method 2: 20-minute test
The standard field test protocol:
- Warm up thoroughly for 20–30 minutes, including several short high-effort bursts
- Ride all-out for exactly 20 minutes on a flat road, a long climb, or an indoor trainer — maintain the highest average power you can sustain for the full duration
- Record your average power for the 20 minutes
FTP is then estimated as 95% of that 20-minute average:
FTP=Average 20-min power×0.95The 5% discount accounts for the physiological difference between maximal 20-minute and 60-minute efforts. In a well-executed 20-minute test, you can hold slightly more power than over a full hour, so the discount brings the estimate in line with true 60-minute threshold.
Method 3: Fitness level estimate
If you have no power meter and no recent test data, the fitness-level method provides a reasonable starting estimate by mapping typical W/kg benchmarks to your body weight. The categories align with commonly cited rider profiles:
| Category | Typical W/kg | Description |
|---|---|---|
| Untrained | ~1.25 W/kg | No structured training history |
| Recreational | ~2.25 W/kg | Regular rides, no interval training |
| Trained amateur | ~3.5 W/kg | Structured training, club racing background |
| Cat 3/2 racer | ~4.5 W/kg | Competitive racing at regional level |
| Elite / professional | ~6.0 W/kg | National or international competition |
This is a coarse estimate — use it to get started, then refine with a real test as soon as you have access to a power source.
The seven Coggan power zones
All zones are expressed as percentages of FTP:
| Zone | Name | % FTP | Physiological target |
|---|---|---|---|
| 1 | Active Recovery | < 55% | Easy spinning, recovery days |
| 2 | Endurance | 55–74% | Fat oxidation, aerobic base |
| 3 | Tempo | 75–89% | Sustained muscular endurance |
| 4 | Lactate Threshold | 90–104% | FTP intervals, threshold training |
| 5 | VO₂max | 105–119% | Aerobic capacity, short intervals |
| 6 | Anaerobic Capacity | 120–149% | Sprint-like efforts, 30-second to 3-minute intervals |
| 7 | Neuromuscular Power | ≥ 150% | All-out sprints, typically < 15 seconds |
Zone 2 (55–74% FTP) is the foundation of most training plans — it develops aerobic efficiency without accumulating the fatigue that comes from higher-zone work. Zone 4 (90–104% FTP) is where improvements in threshold come from. Zones 5 and 6 develop top-end capacity.
Power-to-weight ratio (W/kg)
W/kg=Body weight (kg)FTPAbsolute watts determine sprint performance on flat ground; W/kg determines climbing speed. A 70 kg rider at 280 W has the same W/kg (4.0) as an 80 kg rider at 320 W — and both will climb at the same pace, all else equal. On long mountain climbs, W/kg is the single most predictive performance metric.
Testing tips for accuracy
- Rest before the test: complete a rest or easy recovery day beforehand
- Pacing: start slightly conservatively — going out too hard and blowing up produces an underestimate. A properly paced 20-minute test should feel progressively harder throughout, with the last 3–5 minutes extremely difficult
- Avoid headwinds and technical sections: use a consistent, uninterrupted segment
- Indoor consistency: smart trainers in ERG mode can help, but ride in slope/sim mode for a test so you control pacing yourself
- Retest every 6–8 weeks: FTP changes with training; zones become inaccurate as fitness shifts
Power zones vs. heart rate zones
Power responds instantaneously to effort changes and is unaffected by heat, fatigue state, caffeine, or emotional arousal. Heart rate lags effort by 30–60 seconds and drifts upward during long efforts at constant power (cardiac drift). For short intervals requiring precise effort control, power is the more reliable target. For long endurance rides where zone stability over hours matters more than interval precision, heart rate adds complementary information about physiological load.
Most structured training programs specify power zones for intervals and heart rate for extended Zone 2 aerobic rides.
Frequently Asked Questions (FAQ)
What is FTP in cycling?
FTP (Functional Threshold Power) is the highest average power output, in watts, that a cyclist can sustain for approximately one hour without fatiguing. It serves as the reference point for all seven Coggan power training zones. A higher FTP means you can ride faster for longer. FTP typically improves 5–15% per training block in first-year cyclists; elite riders see smaller annual gains from a higher base.
How do I test my FTP?
The standard field test: after a thorough warm-up, ride all-out for 20 minutes on a flat or climb segment. Record your average power. Multiply by 0.95 to estimate FTP (the 5% discount accounts for the difference between 20-minute and 60-minute maximal power). Ramp tests (incremental 1-minute steps to failure) are shorter and increasingly used by training apps; they correlate well with lab-measured FTP for most riders.
I don’t have a power meter — can I still use this?
Yes. Use the "Estimate from my fitness level" option to pick a category that best describes you; the calculator multiplies the typical W/kg for that level by your body weight to give a reasonable starting FTP.
Alternatives include: renting a smart trainer for a single ramp test, using a stationary bike with a power readout at a gym, looking at recent Zwift/TrainerRoad sessions if you have any, or asking a local cycling club whether they host quarterly FTP tests on a calibrated trainer.
Once you have a real number, switch the method back to "I know my FTP" and enter it.
What is a good W/kg for a cyclist?
Rough benchmarks: Untrained 1–1.5 W/kg; Recreational fitness 2–2.5 W/kg; Trained amateur 3–4 W/kg; Category 3/2 racer 4–5 W/kg; Elite/professional 5.5–6.5 W/kg. These refer to FTP-based W/kg. For climbs specifically, 5-minute peak power (often 10–15% above FTP) is also important, especially on short, steep ascents.
Should I train by power zones or heart rate zones?
Power zones respond instantaneously to effort and are not affected by heat, fatigue, caffeine, or emotional state — making them more precise for interval training. Heart rate zones reflect physiological load but lag by 30–60 seconds and drift upward on long efforts.
Most structured training plans specify power for intervals (where immediate precision matters) and heart rate for long endurance rides (where sustainable effort is the goal). Using both together gives the fullest picture.
Disclaimer
Power zones are training guides, not medical prescriptions. Riders with cardiovascular conditions should consult a physician before high-intensity training. FTP estimated from field tests carries a ±5% typical error compared to laboratory measurement; level-based estimates are coarser still — refine with a real test as soon as you can.
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