FTP Calculator
Functional Threshold Power (FTP) is your best sustainable power for roughly one hour. It anchors every training zone, informs race pacing, and gives you the clearest single number to track long-term fitness progression as a cyclist.
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Frequently asked questions
Understand what FTP means, how tests differ, and how to improve your number.
What is FTP in cycling?
FTP stands for Functional Threshold Power — the highest average power output you can sustain for approximately one hour without going into progressive fatigue. It acts as the cornerstone number for setting training zones, planning race efforts, and measuring fitness gains over time. Almost every structured training plan references FTP either directly or indirectly.
Which FTP test is most accurate?
The 60-minute all-out test is the truest definition of FTP but is brutally hard to pace correctly and is rarely used outside professional teams. For most cyclists, the 20-minute test (multiply average power by 0.95) is the best balance of accuracy and practicality. The ramp test is the most beginner-friendly and is excellent for tracking trends, though it tends to favor riders with strong anaerobic capacity. The 2x8-minute test suits people who struggle with sustained pacing.
Why do different test protocols give different numbers?
Each protocol taps into a slightly different blend of energy systems. The ramp test involves significant anaerobic contribution in the final minutes, so the 0.75 multiplier compensates for power that was not purely aerobic. The 20-minute test relies on you correctly holding back 5% to account for the shorter duration compared to one hour. Pacing errors, fatigue state, and individual physiology all add variance on top of the protocol differences.
How do age, weight, and gender affect my result?
Raw watts favor larger and younger riders simply because more muscle mass produces more force. Watts per kilogram (W/kg) normalizes for body size and is the standard unit for meaningful comparison. Women typically show slightly lower absolute W/kg benchmarks than men at the same training level due to physiological differences in muscle mass and hormonal profiles, though the gap narrows significantly in well-trained populations. Masters athletes (40+) can show excellent W/kg but may naturally see a gradual decline in maximal outputs as age increases.
How can I improve my FTP?
The most time-efficient training for FTP improvement combines sweet spot work (88–93% of FTP) with dedicated threshold intervals (95–105% of FTP). Sweet spot sessions deliver a high aerobic stimulus with manageable fatigue, making them repeatable multiple times per week. Threshold intervals are more demanding but create stronger direct adaptations at the FTP boundary. Both approaches work best when sitting on top of a solid base of Zone 2 aerobic volume, which builds mitochondrial density and fat oxidation capacity that ultimately sets the ceiling for how high your threshold can go.
How often should I re-test my FTP?
Most coaches recommend re-testing every 6 to 8 weeks during a structured training block. Re-testing more frequently adds unnecessary fatigue without producing statistically meaningful changes. It is also important to standardize test conditions: same time of day, similar nutrition in the preceding 24 hours, same environment (indoors or outdoors), and ideally the same equipment. A true FTP gain over a training block is typically 3–8% for a new or returning athlete.
What is a good FTP for a recreational cyclist?
Most recreational cyclists who train a few times per week without a structured plan land between 2.0 and 2.8 W/kg. Dedicated amateur athletes who follow a proper training plan often reach 3.0 to 3.8 W/kg. Cat 3/4 racers tend to cluster around 3.5 to 4.3 W/kg, and Cat 1/2 and elite amateurs sit at 4.5 to 5.2 W/kg. These ranges are guidelines, not limits — consistent training can push anyone higher regardless of where they start.
Can I use FTP for triathlon and gravel racing?
Absolutely. FTP is just as relevant for triathlon bike splits and gravel racing as it is for pure road cycling. In triathlon, the standard guidance is to target 70–80% of FTP for the Ironman bike leg to leave enough in reserve for the run. For gravel races with significant climbing, W/kg becomes even more important than flat FTP because gradient amplifies the penalty for carrying extra body mass.
Does indoor FTP match outdoor FTP?
Not always. Many cyclists find their indoor FTP is 5–10% lower than outdoor due to heat buildup, different cadence patterns, and the psychological challenge of riding indoors. Others, particularly those using smart trainers with ERG mode, find indoor numbers reliable. If you test indoors and race outdoors, it is worth doing at least one outdoor test to calibrate the relationship for your specific situation.