Cycling FTP Calculator

How to Use This Calculator

1. Enter your 20-minute average power from a recent all-out effort and your body weight.
2. Your FTP = 20-min power × 0.95 is displayed with W/kg and cyclist category.
3. Use 8-Minute Test tab if you used that protocol (multiplier 0.90).
4. Use Ramp Test tab for ramp test result (max 1-min power × 0.75).
5. Use Professional for training phase context and retest schedule.

Formula

Example

Frequently Asked Questions

• What is FTP and why is it important for cyclists? ▼
  Functional Threshold Power (FTP) is the highest average power output a cyclist can sustain for approximately one hour — the boundary between aerobic and anaerobic metabolism. It is the single most important performance metric in cycling because it defines all training zones, predicts race performance, and tracks fitness progress objectively over time. When you ride at your FTP, you are at the edge of your sustainable effort — lactate is being produced at the same rate it is being cleared, blood lactate is approximately 4 mmol/L, and you would describe the effort as "very hard but sustainable." Above FTP, lactate accumulates progressively and you will eventually be forced to slow down. Below FTP, you can theoretically ride indefinitely. The power-to-weight ratio (FTP divided by body weight in kg, expressed as W/kg) is the definitive metric for comparing cyclists: professional Tour de France contenders sustain over 6.0 W/kg for 40+ minutes on mountain climbs, while recreational cyclists typically operate in the 2.0-3.5 W/kg range. FTP-based training emerged from the research of Andrew Coggan and Hunter Allen in the early 2000s and is now universally adopted by performance coaches and platforms like TrainingPeaks and Zwift.
• How do I perform the 20-minute FTP test correctly? ▼
  The 20-minute FTP test requires a proper warmup and precise pacing to yield a valid result. Start with a 15-20 minute progressive warmup, ending with 2-3 hard 1-minute efforts to prime the neuromuscular system, followed by 5 minutes easy spinning. Then ride at the highest average power you can sustain for exactly 20 minutes — the pacing challenge is going hard enough to be challenging throughout but not starting so hard that you blow up in the final 5 minutes. Most first-time testers start too hard; a sustainable effort should feel very hard at the 10-minute mark and extremely hard by minute 18, but never completely unsustainable. After the test, multiply your average power by 0.95 to get FTP — the 5% deduction accounts for the difference between 20-minute maximal power and true 60-minute threshold power. The test is best performed on a trainer for controlled conditions, or on a flat-to-slightly-uphill outdoor segment with no stop signs. Use a cadence of 85-95 RPM for most riders. Record heart rate alongside power — your average heart rate at FTP will approximate your lactate threshold heart rate, useful if riding without a power meter.
• What is a good FTP for my level? ▼
  FTP is most meaningfully expressed as W/kg (watts per kilogram of body weight) to compare across different body sizes. Beginners with limited training background typically produce 1.5-2.5 W/kg. Recreational cyclists who ride consistently 3-5 hours per week for several months commonly achieve 2.5-3.2 W/kg. Competitive club cyclists and sportive riders who train 8-12 hours per week typically fall in the 3.2-4.0 W/kg range. Category 3 amateur racers typically achieve 3.5-4.2 W/kg. Category 1-2 racers and elite amateurs reach 4.2-5.0 W/kg. Professional cycling requires sustained 5.5-6.2+ W/kg on major climbs, with World Tour grand tour contenders at the extreme end. Absolute FTP values (without weight normalization) range widely: a lightweight 55 kg climber with 275W FTP (5.0 W/kg) will outclimb a 90 kg rider with 380W FTP (4.2 W/kg), even though the heavier rider produces more absolute watts. Progress is highly individual — beginners can improve FTP by 10-20% in the first training year, while experienced cyclists work hard to gain 3-5% per season.
• Why do I have different indoor vs outdoor FTP? ▼
  Differences of 5-15% between indoor (trainer) and outdoor FTP are common and result from several physiological and environmental factors. Outdoors, cyclists benefit from cooling airflow, which prevents core temperature from rising as quickly and allows sustained higher power output before heat fatigue sets in. Indoor trainers (particularly non-smart wind trainers) also produce different resistance curves than actual riding, and the static position of indoor training reduces the natural side-to-side pedaling motion that engages slightly different muscle activation outdoors. Additionally, psychological factors play a role — many cyclists find it easier to push through pain outdoors due to external motivation, visual feedback from terrain, and the competitive presence of other riders. Some cyclists have the opposite pattern and produce higher indoor numbers due to the absence of traffic, coasting, and descents that interrupt outdoor efforts. Smart trainers in ERG mode eliminate some of these variables but introduce different physiological effects. If you train primarily indoors, use your indoor FTP for indoor training zones; if you race outdoors, test and set zones for outdoor riding separately and expect a moderate difference.
• How often should I test my FTP? ▼
  Testing FTP every 6-8 weeks is the standard recommendation for most cyclists actively pursuing fitness improvements. This frequency allows enough time for meaningful adaptation to occur between tests — if FTP has not changed by 2-3% or more, the test result may simply reflect day-to-day performance variation rather than real fitness change. Testing more frequently (every 3-4 weeks) is counterproductive because each test is itself a training stress that disrupts the week's schedule and provides little additional information. Testing less frequently (every 3-4 months) means training zones may become increasingly inaccurate as fitness evolves. The ideal testing schedule aligns with training phases: test at the start of a training block to set accurate zones, and retest at the end to quantify progress before beginning the next block. Do not test immediately after a hard training week, during a race week, or while fatigued — FTP should be tested after 2-3 days of reduced training load (a mini-taper). Seasonal variation is normal: FTP typically drops 5-10% over a winter off-season and recovers within 6-8 weeks of resumed structured training.

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