Does heart rate determine calorie burn?

[Renodaret]

I have recently started a clen cycle and check my heart rate constantly with my Fitbit. Does a higher heart rate mean quicker rate of calorie burn? Is this why cardio burns calories? I do do cardio every week before you think I'm trying to replace it. Just wondering if higher heart rate=more calorie burn. I googled it but the info was conflicting

 

[bad rad]

IIRC elevated heart rate due to stimulants doesn't equate to higher calorie burn.