Harris-Benedict Equation for BMR

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    JonesersRX7's Avatar
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    Harris-Benedict Equation for BMR


    Harris Benedict FormulaTo determine your total daily calorie needs, multiply your BMR by the appropriate activity factor, as follows:
    1. If you are sedentary (little or no exercise) : Calorie-Calculation = BMR x 1.2
    2. If you are lightly active (light exercise/sports 1-3 days/week) : Calorie-Calculation = BMR x 1.375
    3. If you are moderatetely active (moderate exercise/sports 3-5 days/week) : Calorie-Calculation = BMR x 1.55
    4. If you are very active (hard exercise/sports 6-7 days a week) : Calorie-Calculation = BMR x 1.725
    5. If you are extra active (very hard exercise/sports & physical job or 2x training) : Calorie-Calculation = BMR x 1.9



    BMR = 66 + (13.7xWeigh(kg)) + (5 x Height (cm)) - (4.7 x Age) = Daily resting calories need

    1kg = 2.2lb; 1in = 2.54 cm

    1886 for me x 1.55 = 2923.3

    Well that was a pain in the ass so I found a calculator.. http://www.bmi-calculator.net/bmr-calculator/ also cleaned up the HB equation with a copy and paste.



    So I was trying to shoot for 2100 calories a day (300 cal meals 7 times a day) - I think this is why I stalled out recently on my weight loss. Is there any truth to these formulas?

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    Quote Originally Posted by JonesersRX7
    Is there any truth to these formulas?
    If by truth you are referring to accuracy, not really. HB, Ireton-Jones, Cunningham....et al are all just estimations for certain populations. All tryng to estimate what can be accurately determined by Indirect Calorimetry. Some overestimate, some underestimate, some take consideration for obesity... I have to use them daily at work, but I use them as estimates or I should say starting points. Actually at work I most often use kcal/kg abw. For hospitalized patients I generally use a range of 25-30kcal/kg abw, depending on their condition. Cancer patients are just as hypermetabolic as some athletes, 35-40kcal/kg abw as a starting point. Just tough getting that many calories into someone on Chemo. Obese 12-15 kcals/kg abw, or use an adj bw and 25-30kcal/kg.
    Look at me running on with my keyboard

    Now back to our regularly scheduled program.
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    huh?

    FWIW mine came out to about what i would have expected.. a little high actually
    im shooting for 3000 a day on my cut, and it said my reqs were around 3700
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