FTP in cycling: what the number can and cannot tell you
FTP is a working estimate used to scale power targets. It is useful when the estimate is current and the plan remembers that you are more than one number.
The short version
- FTP estimates a sustainable power reference used to set training targets.
- Different test protocols and platforms can produce different estimates.
- Use trends from comparable tests and pair the number with real ride performance.
FTP is a model for setting work
Functional threshold power is commonly used as an estimate of the power a rider can sustain near threshold. Training platforms use it to scale workout zones, but the exact definition and testing method can vary. Read the protocol before comparing numbers.
A ramp test, a shorter time trial with an adjustment, and a longer steady test do not ask the same question. Even when they aim at the same estimate, pacing skill and fatigue can change the result.
Test when the result will be useful
Use the same setup, calibration routine, and general conditions when comparing tests. Arrive reasonably rested and avoid testing only because one workout felt difficult. Heat, illness, poor sleep, and accumulated training can lower performance temporarily.
A test is demanding training. Put recovery around it and stop if concerning symptoms appear. Riders who are new to high-intensity work do not need a maximal test to begin structured cycling.
Let workouts challenge the estimate
If threshold sessions repeatedly feel unsustainably hard despite good recovery, the FTP may be set too high or the plan may be too demanding. If every target is easy for several weeks and real riding improves, retesting may be useful.
Track more than the headline number. Time you can hold steady work, repeatability across intervals, long-ride durability, and recovery can all improve without a dramatic FTP change.
Common questions
Questions riders ask next
Is FTP the power I can hold for exactly one hour?
It is often described that way, but real protocols use different models and durations. Treat FTP as an estimate for training rather than a guaranteed one-hour result.
How often should I test cycling FTP?
Test when the result would change training targets, not on a fixed short schedule. Several weeks of consistent work usually provide more value than frequent testing.
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Sources and publishing details
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