@dx70 You can probably disregard what the Watch says. I’ve calculated my TDEE by counting all the calories I consume while tracking my weight through the MacroFactor app. I also use an Apple Watch. I have found that the Watch overestimates my average TDEE by several hundred cals/day.
@sabby54 Yeah, max HR is highly individual. My max is substantially higher than the formula suggests too. I think of it like BMI. Fairly helpful for assessing a population, but useless when assessing individuals.