Yeah, i find that fairly accurate for me. When pushing myself to the limit i tend to be around 189, and that calculation gives me 187.
Went out last night with the Garmin HRM for the first time and feel better about my impending death from heart failure!
I know obviously it could depend on various factors but i followed the same "easy" route as i did last week and the average HR was 147. Still probably a little higher than expected but given my height/weight it's properly more where i'd expect it to be vs 165bpm previously reported.
It spikes where i'd expect it to (hill), then drops down nicely as i potter along fairly comfortably and then increases towards the end as i built up the pace for the last stretch.
One thing i did find was how much more comfortable i felt in that end stretch running faster. I was probably around 7:45min/miles for about 0.4miles and whilst it was tiring i definitely felt like i could've continued a bit longer. In the past, any increased pace like that would wipe me out really quickly. I'll put that down to the weight loss which helps motivation to continue.
What's also quite funny is that it feels like i've barely ran this month and am at 58miles for the month which would've been a "typical" month for me last year, yet this month i feel like i've hardly been out and been resting a lot trying to get over this stupid foot issue.
147 is closer to the spot. You said earlier you have a resting HR of 47, which is really low. Your max HR is similar or slightly lower than mine.
A 147bpm average is quite clsoe to what you should be doing. A 140-145 is probably more in line with a true easy pace but you don't have to be that exact.