Just got back from 3 hours and a few minutes at the gym. Wore my new fitbit, I am still trying to figure it out but I I am reading it right it gave me credit for about 400 calories burned. This is in contract to the MFP estimate of 1,300... I know the MFP thing is wrong, if it had been right over the past couple of years I would no longer exist, LOL.
The 400 calories is lower than I had expected, but might be right, certainly closer than MFP.
The heart rate thing seems low, it says my resting heart rate is 65, and when exercising it seemed to be around 100 most of the time, never above 110. And it did not always seem to go with how I was feeling. There is a heart rate monitor on an exercise bike at the gym, I compared and found the bike said my rate was 125, but the fitbit said 105. The calories burned on the bike actually agreed pretty well with the fitbit.
I have a fitbit inspire 2, the cheapest one and use the free, not upgraded app. Anyone here know anything about them? Seems a cleaver device, I am just wondering about accuracy. Even if not very accurate if it is consistent I can see it will be useful. Oh, and I think the steps thing overestimates, but have nothing to compare to.