Wildly inaccurate calorie counts?

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mfarmer88

I know this is an old post but.... I use the same machine on the fat burn setting (love it by the way!) and when I use my HR monitor, the machine tells me I burn less than my HR monitor does. So I have been taking sort of an average from the two of them, which is usually where MFP puts me. My HR monitor will say 600+ and the machine will say 300+, but MFP will be about 450... I also use the formula I found on a website of "For women, this is given by the equation C = (0.4472 x H – 0.05741 x W + 0.074 x A – 20.4022) x T / 4.184. C is the number of calories that you burned, H is your average heart rate, W is your weight, A is your age and T is the length of your exercise session in minutes. Assume that you’re a 28-year-old female weighing 146 pounds. Your average heart rate during an exercise session that lasted 36 minutes was 138 bpm. You burned C = (0.4472 x 138 – 0.05741 x 146 + 0.074 x 28 – 20.4022) x 36 / 4.184 = 301 calories."