Calories Burned BFMB?

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Hello!

I have been doing Jillian Michael's BFBM and I do not have a HRM at the moment, but I am hoping to soon. In the meantime, I was wondering how many calories you guys burn or how much you think it may burn? On here it says 30 Minutes of it is about 400 cal but I swear it feels like tons more! :s
I am over 200 lbs :'( so I didn't know if it would be more or if MFP already takes that into consideration when caculating your calories burned.
Thanks! :#