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FTP calculation

I did a ride of 1 hour and 12 minutes and my average watt was 248 (NP 257). Garmin calculates my FTP at 241 watt. How can the FTP be lower than the average watts you ride for over one hour?

0 Tim_B_ over 6 years ago

I think the ftp is calculated on a steady, continuous, 20 minute effort. It’s possible your efforts outside of that block were higher, but perhaps not continuous.

0 aweatherall over 6 years ago in reply to Tim_B_

It is calculated by the Firstbeat code that is on the Edge. It is looking at HRV data to make the calculation.