Peloton FTP test: what your number means, and where it stops being true

What the test measures, and what the 95% means

The test is a 20-minute best effort and the Bike calculates FTP from its average output [Peloton FTP Guide 2026]. FTP itself is the output you can hold for roughly an hour, so the 20-minute average is scaled down by 5% to estimate it. The scaling is a group average; individually it can miss by tens of watts.

Peloton's own guidance is precise about the input. To start using Power Zones you identify your 20-minute average output, and that number is what you enter under Preferences to have your zones calculated [Peloton Blog 2026]. The conversion to FTP happens behind the setting: multiply the 20-minute average by 0.95, or let the Bike do it [Peloton FTP Guide 2026]. So if your test averaged 200, the FTP driving your zones is 190, and a zone 4 floor at 91% sits at roughly 173 rather than 182. Riders who assume the number on screen is their FTP end up with zones about 5% too hard.

The 5% is a convention, not a measurement of you. Borszcz and colleagues put 23 trained cyclists through a 20-minute test and a full 60-minute effort and found the group averages nearly identical — a bias of only 1 to 5 watts — while the individual limits of agreement ran as wide as 62 watts below to 60 above [Borszcz et al. 2018]. Time to exhaustion at the 20-minute-derived power averaged 50.9 minutes, not 60. Against the lab's maximal lactate steady state the same 95% estimate carried a bias of 1.4% with limits of about 9% either way [Borszcz et al. 2019]. Good on average, loose for one rider.

The warm-up is part of the protocol, which is why Peloton pairs the test with a dedicated FTP Warmup Ride [Peloton Blog 2026]. Tramontin and colleagues had cyclists ride the same 20-minute test after different warm-ups and recorded averages from 256 to 270 watts — about 5% moved by the warm-up alone [Tramontin et al. 2022]. Skip the warm-up ride one month and take it the next, and the change in your number may be the warm-up, not your fitness. Do the test the same way every time.

Your Peloton number is a Peloton number

Output on the Bike is calculated, not measured. Hall effect sensors read flywheel speed and resistance and the console derives watts from those values [Peloton Support 2026]. The brake is calibrated at the factory with what Peloton calls minor variation from Bike to Bike [Peloton Calibration 2026]. Inside Peloton none of that matters; outside it, all of it does.

A crank or pedal power meter measures the torque you apply with strain gauges. The Peloton Bike does something different: sensors capture cadence and the resistance setting and reference output values on the sensor control board [Peloton Support 2026]. That is a lookup, and it is only as good as the mapping between the resistance knob and the brake. The original Bike has a manual magnetic brake calibrated in manufacturing, and Peloton states plainly that there is some minor variation from Bike to Bike; the Bike+ has a digitally controlled brake that calibrates itself on first use [Peloton Calibration 2026]. Peloton also lists room temperature among the things that make output feel different, which is the indoor heat problem our guide on indoor versus outdoor FTP covers in full.

We could not find a peer-reviewed study that tests Peloton output against a calibrated strain-gauge meter, so nobody can tell you the size of the gap with evidence. What can be said is that the reading is consistent with itself. Because Power Zones are ratios of your own test on your own Bike, a Bike that reads 5% high reads 5% high in zone 2 and in zone 5 alike, and every Power Zone class still lands at the intended intensity. The ruler is bent, but you are always measuring with the same ruler.

The moment you carry the number to a different ruler, the bend shows. A Peloton FTP entered into Zwift, a head unit paired with pedals, or any app that reads outdoor rides sets zones that are off by your Bike's offset, in a direction you cannot know in advance. Different apps already disagree about FTP for reasons of method; a different sensor adds a second disagreement on top. Treat the Peloton number as valid on the Peloton Bike and as a rough starting guess anywhere else, and retest on the new equipment before you trust a zone.

Turning the number into zones, and what each zone is for

Peloton uses seven zones, each a band of FTP: zone 1 under 55%, zone 2 at 56 to 75%, zone 3 at 76 to 90%, zone 4 at 91 to 105%, zone 5 at 106 to 120%, zone 6 at 121 to 150%, and zone 7 above 151% [Peloton Blog 2026]. These are the standard power-based bands, so a Power Zone class and a coach's plan speak the same language.

The bands do specific jobs. Zone 2 is where most of an endurance rider's hours belong; it builds the aerobic base and can be repeated day after day. Zone 3 is sustainable but costly, and the top of it — the sweet spot around 88 to 94% of FTP — is where time-limited riders get the most threshold progress per hour. Zone 4 straddles FTP itself and trains the ability to hold it. Zone 5 is the VO2max band, ridden in intervals of three to five minutes. Zones 6 and 7 are anaerobic and sprint work, minutes and seconds respectively.

You do not need to work the percentages by hand. Once the Bike has your test, it customizes each zone's output range for you [Peloton Blog 2026], and a power zone calculator gives the same bands in watts for any FTP if you want to see them written out. What matters more than the arithmetic is remembering which FTP you are converting: the 95%-scaled value, not the raw 20-minute average. Peloton's Custom Value setting takes the raw average and does the scaling; a calculator expects the FTP.

Retesting, and where Peloton stops

Peloton's own pages give two retest intervals — every 4 to 6 weeks in its Power Zone guide and every 6 to 12 weeks in its FTP guide [Peloton Blog 2026, Peloton FTP Guide 2026]. Both are more often than most riders need. The better trigger is the workouts themselves, and the bigger gap is that a Peloton FTP feeds classes, not a plan.

The retest interval is a judgement call, and Peloton's two answers show it. A 20-minute maximum effort costs real recovery, and an FTP that moves 2% in six weeks is inside the noise of the protocol — Tramontin's warm-up effect alone was 5% [Tramontin et al. 2022]. Retest when zone 4 rides have become comfortable, when zone 5 intervals are finishing with something in reserve, or after a break long enough that the old number is clearly stale. Our guide on how often to test FTP makes the case for a couple of anchored efforts a year rather than a calendar.

Between tests, the honest answer to the question this article started with is that your number is already in your riding. Every hard Power Zone class leaves a best 5-, 10-, and 20-minute output behind, and a threshold estimated from that power curve tracks your fitness continuously without a test day. That is the approach our pillar on finding FTP without a test describes, and it is what AdaptCycling does for riders whose ride files reach a platform we read: we fit a Critical Power model to your mean-maximal-power curve and update the estimate as new rides arrive. We read Wahoo, Hammerhead, Polar and intervals.icu today; a Peloton-only rider can use the test number as the seed.

The larger limit is structural. A Power Zone class is an instructor calling zones for a room; the number you tested personalizes the targets, but the sequence of classes is yours to choose, and nothing restructures the week when you miss Tuesday or get sick. Peloton makes the hour you show up for a hard, well-cued hour. Deciding which hours, in what order, and what changes when life intervenes is the part a plan exists to do.

Quick answers

Sources cited in this guide

1. 01
   Peloton Blog 2026. Power Zone Training with Peloton: Everything You Need to Know. Peloton.
2. 02
   Peloton FTP Guide 2026. Functional Threshold Power (FTP): How to Test & Why It Matters. The Output by Peloton.
3. 03
   Peloton Support 2026. Bike and Bike+ Metrics. Peloton Support.
4. 04
   Peloton Calibration 2026. Calibrating Your Peloton Bike or Bike+. Peloton Support.
5. 05
   Borszcz et al. 2018. Functional Threshold Power in Cyclists: Validity of the Concept and Physiological Responses. International Journal of Sports Medicine.
6. 06
   Borszcz et al. 2019. Is the Functional Threshold Power Interchangeable With the Maximal Lactate Steady State in Trained Cyclists?. International Journal of Sports Physiology and Performance.
7. 07
   Tramontin et al. 2022. Functional Threshold Power Estimated from a 20-minute Time-trial Test is Warm-up-dependent. International Journal of Sports Medicine.

More inside FTP without a test

Other articles in this series

1. 01

   Indoor vs outdoor FTP: why the numbers differ

   Why your indoor FTP reads lower than outdoor — heat, cooling, motivation, and power-source differences — and whether to keep two numbers.

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2. 02

   How to estimate FTP without a power meter

   Estimating FTP from heart rate, RPE, and Strava when you don't own a power meter — how close you can get and where the method breaks down.

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3. 03

   20-minute vs 8-minute FTP test: which to use

   How the 20-minute and 8-minute FTP tests differ, the multipliers each uses, and which one fits your riding — plus why both are only protocols.

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4. 04

   Why cycling apps show you different FTP numbers

   Strava, Xert, Intervals.icu, and TrainingPeaks can each report a different FTP. Why the estimates diverge and which one to trust.

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5. 05

   Is your ramp test FTP too high? Why it happens

   Ramp tests overestimate FTP for anaerobically-gifted riders and underestimate it for diesels. Why the 75% rule misfires and how to correct it.

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6. 06

   How often should you test your FTP?

   How often to re-test FTP as a self-coached cyclist — twice a year, not every six weeks — and why modeled estimates change the cadence.

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7. 07

   Critical Power vs FTP: which number should you trust?

   CP and FTP track each other across a group but can differ 20-36W for you specifically. Why there is no correction factor, and which to anchor to.

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8. 08

   Can you actually hold your FTP for an hour?

   Published time-to-exhaustion at FTP runs 34 to 51 minutes across studies, never 60, and the individual spread is wide. Why the hour is a bad test.

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9. 09

   FTP stopped improving: are you a non-responder?

   Non-responder labels flip for 45% of people depending only on the statistics used. What a flat FTP usually means instead, and what to check first.

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10. 10

    Durability: why your power fades late in long rides

    What durability is, why the kJ threshold your app uses is arbitrary, and the honest evidence on whether it is independent of FTP or trainable.

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11. 11

    Which Zwift FTP test should you take?

    Zwift ships four FTP tests and splits the ramp by body weight at 60 kg. Which to pick, what ERG actually does, and when to skip testing.

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