Circuit training calories burned?

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I just finished Jillian Michaels No more trouble zones DVD and my HRM says I burned 578 calories. This DVD was really tough for me but this is about the same amount of calories I burn doing zumba. I looked at multiple circuit training calculators and they all said I'd burn around 550-600. It just seems like a lot...I don't want to overestimate my calories burned. So is this accurate for this DVD or circuit training in general?