HRZs on Charge 5 don't match app

[Emthesuz]

On the fit bit app it shows that my cardio heart rate zone starts at 132 and peak starts at 162. However, on my charge 5, when I reach 125 it says I’m in cardio and when I reach 151 it says I’m in peak. I’ve tried a factory reset but the charge 5 heart rate zones still don’t match the app heart rate zones. How do I fix this?

[RiekoC]

Hello & welcome @Emthesuz 

I noticed that you recently created your Fitbit account. Did you recently get a Charge 5? If so, I'm thinking the discrepancy in the heart rate zones might be because you recently started using your Fitbit device.

I think the zones in the app are based on people in your age group until you've worn your device long enough that it calculates your heart rate zones based on your daily wear & data. Once there is enough data to establish your heart rate zones based on your data, I'm pretty sure they should match. 

This page has more information that you might find helpful: How do I track heart rate with my Fitbit