Cycling Power Zones Calculator (FTP)

FTP stands for Functional Threshold Power — the highest average power output in watts that a cyclist can sustain for approximately 60 minutes. It is the most widely used metric for defining training zones and tracking fitness progress over time.

The most common method is the 20-minute FTP test: warm up for 10–15 minutes, then ride all-out for 20 minutes. Multiply your average power for those 20 minutes by 0.95 to get your estimated FTP. Alternative: a 60-minute maximal time trial (average power = FTP).

Most coaches recommend retesting every 6–8 weeks, or at the end of a training block. After a long break or a new training phase, retest before updating your zones.

A typical recreational male cyclist has an FTP of 150–250 W (roughly 2.0–3.0 W/kg). Competitive amateurs are typically 3.0–4.5 W/kg, and professional road cyclists exceed 5.5–6.0 W/kg.

Zone 3 (76–90% FTP) is a comfortably hard effort you can sustain for 1–3 hours. Zone 4 (91–105% FTP) is at or near your lactate threshold — a harder effort you can sustain for 20–60 minutes and that produces the greatest gains in threshold power.

Yes — research and elite coaching practice both support spending 70–80% of total training volume in Zone 2 (aerobic endurance). High-volume Zone 2 work builds aerobic capacity, improves fat oxidation and creates the foundation for high-intensity work.

W/kg (watts per kilogram) is FTP divided by body weight. It normalises power output for body size and is the key metric for comparing climbing ability. The heavier you are, the more watts you need to climb at the same speed as a lighter rider.

Yes. Smart trainers measure power directly in watts, so the zones are directly applicable. If you use a power meter on the road and then train on a smart trainer in ERG mode, set the target wattage to the midpoint of the desired zone.

No. Power zones and heart-rate zones are different systems, though they roughly correlate. Power responds immediately to effort changes; heart rate lags by 30–90 seconds. For interval work, power zones are more precise. Heart rate is still useful for aerobic base training.

Zone 7 involves maximum-effort sprints lasting 5–15 seconds. It trains the fast-twitch muscle fibres, improves peak sprint power and neuromuscular coordination. These efforts cannot be sustained and are used sparingly — typically 2–6 repetitions in a session with full recovery between efforts.