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FTP TEST CALCULATOR

Apply a stated protocol equation to a completed test result. Outputs are estimates, not interchangeable laboratory thresholds.

Not sure which protocol fits? Read the FTP test selection guide.

TEST PROTOCOL

A common field estimate: this calculator applies 95% to your 20-minute average. The conversion is not exact for every rider.

Conversion factor: FTP = 95 % of your 20 min power

METHODOLOGY

What this tool does: It applies the displayed conversion factor to the value you enter. It does not verify the test protocol, device, pacing or physiological threshold, and it does not make different tests interchangeable.

20-minute equation (× 0.95): TrainingPeaks documents this as an estimate. A scoping review found the field test can be reliable while agreement with physiological threshold markers still has meaningful individual limits.

Ramp and 8-minute equations: These are simplified fixed-factor calculations. Platforms can define the input and conversion differently, so use the equation supplied with the protocol you actually completed.

Measurement boundary: A systematic review found that cycling power-meter validity and reproducibility can vary with the device and testing conditions, including cadence, temperature and exercise intensity. Keep the same hardware and calibration procedure when following a trend.

Interpretation boundary: Time to exhaustion at a measured FTP varies substantially. Use the result as one training anchor and review the wider power-duration curve, session response and target-event demands.

Reviewed references: FTP field-test scoping review · cycling power-meter review · time-to-exhaustion study

Reviewed by Anthony Walsh for method and primary-source alignment · Last updated: 26 August 2026

FROM HERE

ARTICLEEvery FTP Test Protocol Compared — Which One Should You Use?Four protocols, four conversion factors, and one question every cyclist with a power meter eventually asks: which FTP test should I actually use?PODCASTTestosterone Truth: 99% Don't Know This Energy Secret | Dr Gordanwith Dr GordanARTICLEWhen to Test FTP — And When Testing Does More Harm Than GoodEvery six to eight weeks is the standard advice, but context changes everything. A badly timed FTP test can wreck the training stimulus you have been building for weeks. This is when testing actually helps, when it does more harm than good, and how to know your FTP has moved without pinning a number on it.ARTICLEWhen Your FTP Test Lies — And What to Do About ItThe test gives you a number. Your training tells you whether it's honest. Here is how to spot a lying FTP and what to do about it.

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