Transfer of data

[JohnGriffy]

• The heart rate range on my pixel 3 is different to that on the app.  Not out a great deal but should it be out at all.  They should be the same surely.  I assume the watch is accurate as that measures the pulse.  The phone does not.

[Gr4ndp4]

Hi, @JohnGriffy welcome. Gemini tells us -

The different heart rate (HR) ranges on your Pixel Watch 3 (PW3) and the Fitbit app are due to the app showing a more detailed, personalized calculation that adjusts to your fitness level. The watch itself typically provides a more basic, real-time estimate based purely on your age. 

Here's a breakdown of the differences:

• Watch display: On your PW3, the heart rate zones shown during an activity are often a simpler, age-based estimate calculated using the formula "220 - your age". This provides a quick, easy-to-understand reference during a workout.
• Fitbit app: The app, especially for the Google Pixel Watch series, uses a more advanced and accurate method called Heart Rate Reserve (HRR). This method accounts for both your:
  • Maximum heart rate (calculated from your age)
  • Personal resting heart rate, which the watch measures overnight
• Personalized zones: By factoring in your specific resting heart rate, the app generates more accurate, personalized heart rate zones. As your fitness improves and your resting heart rate lowers, the app will automatically adjust your zones. This means your "Fat Burn" or "Cardio" zones will be different—and more precise—in the app than on the watch.
• Different data sampling: The data is also displayed differently. While your PW3 shows real-time HR during a workout, the app's graphs show a five-minute average, which can smooth out brief spikes or dips. 

I hope this helps.

Cheers