21.6x(LBM in kg) + 310 has always been accurate for me based on what the body gem predicted it to be (A little device that measures gas exchange).
Then you multiply by your daily activity level
Sedentary = BMR X 1.2 (little or no exercise, desk job)
Lightly active = BMR X 1.375 (light exercise/sports 1-3 days/wk)
Mod. active = BMR X 1.55 (moderate exercise/sports 3-5 days/wk)
Very active = BMR X 1.725 (hard exercise/sports 6-7 days/wk)
Extr. active = BMR X 1.9 (hard daily exercise/sports & physical job or 2X day training, i.e marathon, contest etc.)
Then you have an estimate of your energy expenditure, subtract 500 cals from that to lose 1lbs/wk, 1000 cals to drop 2lbs. Keep in mind it is an estimate.
Those activity levels I took from http://www.shapefit.com/basal-metabolic-rate.html
They seem to be a bit more elaborate than the ones I used.



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