Harris-Benedict Equation for BMR

  1. 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?

  2. 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.

  3. 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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