FasCat power zones vs TP vs. Garmin

Hey Guys, this might have been answered here before. So please direct me if it has been. I completed my 20 field test this morning for power and used the excel sheet to calculate my training zones. I noticed that there is a large difference between the power zones recommended on that sheet versus what training peaks auto populated for my FTP, as well as what Garmin auto populated.

I have been training using Garmin’s power zones for years now and am wondering why there was such a large difference.


Choose ‘Andy Coggan’ zones in TrainingPeaks but you’ll have to manually add your sweet spot between 84-97%

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