I'm sorry but I don't see being able to calculate without the vo2 max or at least the persons resting heart rate. I use my bmr + (average heart rate - resting heart rate)*6 and it comes out very close to my calorie burn for the day. The 6 is just a variable that works for my body and could just as easily be a 5 for a overweight female or a 7 for a male athlete. There are flaws to this also but it does not come out with outrageously hi numbers like that formula

I'm sorry but I don't see being able to calculate without the vo2 max or at least the persons resting heart rate. I use my bmr + (average heart rate - resting heart rate)*6 and it comes out very close to my calorie burn for the day. The 6 is just a variable that works for my body and could just as easily be a 5 for a overweight female or a 7 for a male athlete. There are flaws to this also but it does not come out with outrageously high numbers like that formula