Calculate your Functional Threshold Power (FTP) from a 20-minute test, ramp test, or 8-minute test. Set Coggan power zones for structured cycling training.
Functional Threshold Power (FTP) is the highest average power you can sustain for approximately one hour. It's the gold standard metric for cycling fitness and the foundation of power-based training. Knowing your FTP lets you set precise training zones, track fitness changes, and pace races optimally.
This calculator estimates your FTP from three common test protocols: the 20-minute test (most popular), the ramp test (shortest), and the 8-minute test. It also generates your seven Coggan power training zones so you can structure workouts immediately.
Whether you're a road cyclist, triathlete, or indoor cycling enthusiast, FTP is the single most important number for effective training. Whether you are a beginner or experienced professional, this free online tool provides instant, reliable results without manual computation. By automating the calculation, you save time and reduce the risk of costly errors in your planning and decision-making process. This tool handles all the complex arithmetic so you can focus on interpreting results and making informed decisions based on accurate data.
Training without knowing your FTP is like driving without a speedometer. FTP-based zones ensure every workout targets the right physiological system. This calculator takes your test result and instantly provides your FTP and all seven training zones. Having a precise figure at your fingertips empowers better planning and more confident decisions.
FTP estimation by test type: • 20-minute test: FTP = 95% of 20-min avg power • Ramp test: FTP = 75% of best 1-minute avg power • 8-minute test: FTP = 90% of avg of two 8-min intervals Coggan Power Zones: • Z1 Active Recovery: <55% FTP • Z2 Endurance: 56–75% FTP • Z3 Tempo: 76–90% FTP • Z4 Lactate Threshold: 91–105% FTP • Z5 VO2max: 106–120% FTP • Z6 Anaerobic: 121–150% FTP • Z7 Neuromuscular: >150% FTP
Result: FTP = 238 watts
For a 20-minute test with 250W average: FTP = 250 × 0.95 = 237.5, rounded to 238W. This means your Zone 2 (endurance) range is 133-178W, and your Zone 4 (threshold) range is 216-250W. Training at these precise intensities targets specific physiological adaptations.
FTP approximates the boundary between sustainable and unsustainable exercise intensity. Below FTP, lactate production and clearance are balanced; above FTP, lactate accumulates progressively. Training at and around FTP improves this balance, raising the power you can sustain.
Dr. Andrew Coggan's seven-zone model is the standard for power-based training. Each zone targets a specific physiological adaptation: Z1-Z2 build aerobic base, Z3-Z4 develop threshold and tempo fitness, Z5 improves VO2max, and Z6-Z7 develop anaerobic capacity and neuromuscular power. A balanced training plan includes work across all zones with periodized emphasis.
While FTP is the most practical training metric, it's not the only one. Critical Power (CP), w' (anaerobic work capacity), and VO2max provide additional insights. FTP is most useful for events lasting 20 minutes to several hours; shorter events rely more on anaerobic capacity.
FTP varies widely. For recreational cyclists, 150-200W is typical. Competitive amateur cyclists often achieve 250-300W. Elite cyclists may exceed 350W. However, FTP relative to body weight (W/kg) is more meaningful for performance comparison.
Because FTP represents one-hour power, and most people can sustain about 5% more power for 20 minutes than for 60 minutes. The 95% factor approximates this relationship. Some athletes may need 92-97% depending on their anaerobic contribution.
Every 6-8 weeks during structured training, or whenever you feel your zones are too easy/hard. FTP can change significantly over a training block, especially for newer cyclists. Experienced cyclists may see smaller changes.
The 20-minute test is considered the gold standard for accuracy. The ramp test is popular for its simplicity and repeatability but may overestimate FTP for some riders. The 8-minute test is a shorter alternative with moderate accuracy.
Not accurately. Heart rate zones are an alternative for unstructured training, but power meters provide precise, instantaneous feedback that heart rate cannot. Smart trainers with built-in power meters are the most accessible option.
Yes, typically indoor FTP is 5-10% lower due to reduced cooling, mental monotony, and lack of road feel. If you train primarily indoors, test indoors. Use separate FTP values for indoor and outdoor training if possible.