What is FTP in Cycling?
Functional Threshold Power (FTP) is the highest average power output in watts that a cyclist can sustain for approximately one hour. It is the single most important metric in power-based cycling training because it anchors all seven training zones — from active recovery through to neuromuscular power.
Knowing your FTP lets you train with precision rather than guesswork. Instead of riding by feel, you can target specific physiological adaptations: building aerobic base in Zone 2, improving lactate clearance at threshold, or boosting VO2max with hard intervals.
FTP Test Methods
- 20-minute test: ride all-out for 20 minutes on a steady climb or turbo trainer. FTP = average power × 0.95.
- 8-minute test: two all-out 8-minute efforts with a 10-minute rest between. FTP = average power × 0.90.
- Ramp test: increase power by a fixed amount every minute until failure. FTP = last completed minute wattage × 0.75.
Understanding Power-to-Weight Ratio (W/kg)
Power-to-weight ratio (W/kg) normalises FTP for body weight and is especially useful for climbing performance. A lighter rider with the same FTP as a heavier rider will climb faster. W/kg is the primary metric used to classify cyclist fitness levels.
- Under 2.0 W/kg: untrained / beginner cyclist
- 2.5–3.5 W/kg: recreational cyclist, sportive rider
- 3.5–4.5 W/kg: competitive amateur, Cat 4/5 racer
- 4.5–5.5 W/kg: elite amateur, Cat 1/2 racer
- 5.5+ W/kg: professional cyclist
Frequently Asked Questions
How often should I test my FTP?
Most structured training programmes re-test FTP every 4–6 weeks, or at the start and end of each training block. Testing too frequently is unnecessary and the test itself is very fatiguing. A meaningful improvement in FTP typically requires 4–8 weeks of consistent targeted training.
Which FTP test is most accurate?
All three tests are approximations. The 20-minute test is most commonly used and validated in the literature, but requires significant pacing discipline. The ramp test is popular because it is easier to execute correctly — the constant fatigue removes the need for pacing judgment. Choose the method that suits your experience level and available equipment.
What is Zone 2 training and why is it important?
Zone 2 (56–75% of FTP) is the aerobic endurance zone. Long rides at this intensity build mitochondrial density, fat oxidation capacity, and cardiac efficiency — the foundation of endurance cycling fitness. Elite cyclists typically spend 70–80% of their total training volume in Zone 2.