ARVENTO Performance Tool · Know your engine.
FTP is an estimate of your sustainable threshold power and is commonly used to set cycling intensity and training zones. Use measured 20-minute power, a cautious climb model, or an FTP you already know.
Quick answer: A common way to estimate cycling FTP is to complete a steady 20-minute power test and multiply the average power by 0.95. Divide FTP by body weight to calculate power-to-weight ratio in watts per kilogram (W/kg). FTP is useful as a pacing and training reference, while W/kg becomes increasingly important on sustained climbs.
Calculate
01 · Equipment
Power Meter → measures watts.
Bike Computer → records 3-second power, 10-second power, lap power, and ride data.
FTP Test / Ride Data → provides the average power used for an estimate.
Bike-computer examples include Garmin, Wahoo, and Hammerhead.
Smart Trainer → provides controlled power measurement away from traffic.
Compatible apps may include Zwift, MyWhoosh, TrainerRoad, and other training platforms.
02 · Field protocol
Use a power meter or smart trainer and choose a safe, uninterrupted route or indoor trainer. Outdoors, avoid traffic-heavy roads, steep descents, intersections, and any setting where a hard effort would reduce safe control.
Controlled → Hard → Finish strong
Never prioritize a test over traffic awareness, road conditions, health, or safe riding.
03 · Terrain
These bars are qualitative indicators, not scientific scores. They describe changing influences without implying that any one factor acts alone.
Absolute power + aerodynamics matter more
Power, aerodynamics, and W/kg all contribute as speed and gradient change.
W/kg becomes increasingly important, while absolute power still matters.
04 · Ride with power
A smoothed real-time field that responds quickly without the noise of instantaneous power. Useful for grade changes, accelerations, immediate pacing adjustments, and climbs.
A calmer reference than 3-second power. Useful on long flat roads, for sustained endurance work, steady climbing, or when short fluctuations invite overreaction.
The average power for the current lap or segment. Useful for long climbs, intervals, structured segments, and checking whether the complete effort is on target.
These are starting points, not universally best layouts.
3s Power or 10s Power · Lap Average Power · Heart Rate · Speed
3s Power · Lap Average Power · Grade · Heart Rate · optional W/kg when supported
3s Power · Lap Average Power · Lap Time · Heart Rate
05 · Use the number
After an FTP result, the calculator generates approximate watt ranges. Plain-language guidance comes first; conventional zone names remain available for riders who use structured training.
FTP does not reliably predict an individual's sprint power, so Z7 has no calculated watt range.
06 · Privacy
No login is required. FTP, body weight, test power, and climb inputs remain in current-page memory. This tool does not transmit or persist your values and uses no analytics, external APIs, cookies, or browser storage.
07 · FAQ
FTP is an estimate of sustainable threshold power used to guide cycling intensity, pacing, and training zones; it is not an exact one-hour maximum.
No. A well-paced 20-minute power test is a common, more approachable way to estimate FTP.
Multiply the complete 20-minute average power by 0.95, then label the result as estimated FTP.
The 0.95 factor makes a practical downward adjustment because many riders can exceed threshold power for 20 minutes, but the appropriate relationship varies by rider.
It can be a useful estimate when power is measured and pacing is steady, but fitness, fatigue, calibration, interruptions, and individual physiology affect accuracy.
A power meter or smart trainer provides the most useful field-test data; you can also enter an FTP established by another suitable test.
A steady climb can support a rough physics-based estimate, but wind, surface, position, inputs, and pacing make it lower confidence than measured power.
W/kg is threshold power divided by body weight, showing how much threshold power is produced per kilogram of rider mass.
Divide FTP in watts by body weight in kilograms; for example, 209 W divided by 60 kg is about 3.48 W/kg.
Neither is universally more important: absolute watts and aerodynamics strongly influence flatter riding, while W/kg becomes more influential on sustained climbs.
Gravity becomes a larger part of resistance as a climb steepens, so producing more power relative to rider mass becomes increasingly useful.
Yes. FTP remains a useful pacing reference, while speed on flatter roads also depends strongly on absolute power and aerodynamics.
Use 3-second power for a responsive pacing view or 10-second power for a calmer view; the better choice depends on the ride and how you react to fluctuations.
A practical page may pair 3-second or 10-second power with Lap Average Power, then add fields such as heart rate, grade, speed, or lap time for the ride.
Retest after a meaningful training period or fitness change, often around six to eight weeks, when you are rested and can use safe, repeatable conditions.
FTP can inform pacing and effort estimates, but a GPX route prediction also depends on terrain, weather, aerodynamics, rolling resistance, stops, and rider condition.
08 · Third parties
Garmin, Wahoo, Hammerhead, Zwift, MyWhoosh, and TrainerRoad are examples only. No affiliation is implied, and their inclusion is not an endorsement or a claim of compatibility with every device or setup.
09 · Limits
The 20-minute multiplier may over- or under-estimate an individual's sustainable threshold. The climb model cannot observe actual wind, CdA, road surface, drivetrain condition, measurement error, or pacing, so it reports an approximate ±15% range and deliberately lower confidence.
This educational tool does not provide medical advice, diagnose fitness, rank riders, sync accounts, store history, analyze routes, or replace professional coaching or a controlled performance assessment.
The model uses road distance, elevation gain, elapsed time, combined mass, rolling resistance 0.0045, CdA 0.33, air density 1.225 kg/m³, gravity 9.80665 m/s², and drivetrain efficiency 0.97. A 15–25 minute hard, steady effort may produce a rough FTP estimate; other efforts remain estimated sustained power only.