Pixel Watch overestimates calorie burn

[BigandTall]

I have been using fitbits since 2016 and have purchased many. Recently I upgraded to Charge 5 and was horribly disappointed that there is a latching flaw for the bands, which constantly pop off. So I decided to upgrade to the Google Pixel - and now come to find out the Pixel overestimates calorie burn by double digit percentages. Pls Improve!

Moderator Edit: Clarified subject

[charleskn]

Hello @BigandTall Could you say more about your issues with the band not latching properly? Is this where the band connects to the Fitbit, or the way the band latches to itself while you're wearing it?

Unfortunately, the caloric burn accuracy of fitness trackers is notoriously bad due to the inherent assumptions that must be made. For example: For a given weight, if I have 30% body fat versus 10% body fat. Fat is metabolically inert, where muscle burns calories. Weight is a primary number used to calculate the base metabolic calorie burn rate (BMR), and it can be off by 20% in this case, and only from the weight factor.

This is just my opinion, but the value of the calories burned, with something like a Fitbit, is tracking your trend of calories burned. Your BMR doesn't change much (only if you change your settings), so changes in your total caloric burn will be directly related to the amount of physical activity (e.g. am I working harder/more or not as hard/less?).

Here are some articles talking about this:

https://www.wellandgood.com/calorie-counters-on-fitness-trackers/

https://www.thebioneer.com/a-comprehensive-guide-to-your-diet-how-to-eat-well-lose-weight-and-build-...

https://youtu.be/t53muLLMH9A

[SunsetRunner]

10% vs 30% body fat is a 20% difference.
So assuming your weight is 100kg, that's 20kg more muscle and less fat.
But 1kg of muscle burns only about 9 ckal more than 1 kg of fat at rest.
So that's just 180 kcal in an rather extreme example. 
Now assuming that any fitness tracker doesn't put you at 10% body fat, ut maybe more in the middle at around 20% (fitbit could actually know your bodyfat% anyway, if you enter it). That would only account for roughly 100 kcal of a daily total burn of maybe 2500 for a rather sedentary 100kg person. That is not even close to20%! Only about 4%.
Having said that, Fitbit generally estimates an unrealistically high burn compared to some competitors. I switched because of the (ongoing) drama with the messed up graphs and now I only get 50 to 80% of the burn I used to, depending on the activity. Weight gain/loss vs. logged calorie balance line up much better now.