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Functional Threshold Power Calculator

Estimate cycling FTP from a 20-minute power test

How to use

  1. Enter your values in the fields above.
  2. Press Calculate to see your result instantly.
  3. Use the Share button to copy a link to your result.

About this calculator

Functional Threshold Power is estimated as 95% of your average power output over an all-out 20-minute effort — a proxy for the power you could theoretically sustain for a full hour, without needing to actually suffer through a 60-minute test.

Coined by Andrew Coggan and now standard in cycling training software like TrainingPeaks and Zwift, FTP anchors every training zone a cyclist uses — zone 2 endurance rides, threshold intervals, VO2max efforts — all defined as percentages of it, and it's re-tested every few weeks so training zones stay accurate as fitness improves.

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