Insanity - question calories burned

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Hey, I was just wondering what people put in for their calories burned for insanity. Do most people have a heart rate monitor? I noticed with other weight loss programs there are calculators or other devices that will tell you approx. how many calories you should burn with entering your weight etc.

If anyone could help me out because I'm planning on starting it Monday and I don't have a HRM :(

Thanks :)