Calculate Your Basal Metabolic Rate

I don’t believe in counting calories in order to restrict caloric intake. Rather I promote caloric awareness in the effort to get people to realize that they usually don’t eat enough food, not that they eat too much.
Calculating your Basal Metabolic Rate (BMR) is quite simple.  Here’s the formula.

  • Convert weight in pounds to kilograms by dividing by 2.2.
  • Convert height in inches to centimeters by multiplying by 2.54.
  • Plug in kilograms and centimeters where appropriate in the following formulas.  The numbers that result the calculations are the calories that you need in a day to maintain current body weight with little or no exercise.
  • Daily Resting Energy Expenditure Formula for Males
  • 66 + (13.7 X kilograms) + (5.0 X centimeters) – (6.8 X years)
  • Daily Resting Energy Expenditure Formula for Females
  • 665 + (9.6 X kilograms) + (1.85 X centimeters) – (4.7 X years)
  • Let’s use the example of a 38-year old woman who stands 5’ 3” and weighs 125-pounds. Here are the calculations.

    • 665 + 559 + 296 =1520
    • 1520 – 179 = 1341 needed per day just to maintain without any additional energy expenditure.

    Note the emphasis that 1341 calories are need just to maintain the status quo if this woman were just to sit around doing nothing during her waking hours.  To approximate the true daily caloric requirement taking into account activity level we can use the Harris-Benedict Formula, which applies a factor to the BMR.  Here are the factors according to 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)
    • Moderately 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)
    • Extra active = BMR X 1.9 (hard daily exercise/sports & physical job or 2X day training, i.e marathon, contest etc.)

    Using the above example, apply the Moderately Active factor to the BMR of this working mother of three children who trains at least as hard as specified in this category.

    • 1341 x 1.55 = 2078

    I can guarantee that 99% of the women who fit the description of the example do not get anywhere near 2100 calories per day.  I’ll also wager that of these women, most are engaged in a regular struggle to lose 5-10-pounds, and do so by restricting rather than adding calories.  And keep in mind that these calculations under estimate the requirements for people are either very fit or very fat. So calculate your BMR and gain an appreciation for how many calories are needed in a day to fuel your body.

    1. News to Note | Live Fit and Sore
      January 25, 2010 at 8:14 pm

      […] Calculate Your Basal Metabolic Rate | Fitness Articles, Workout Tips. Everyone always says its not the # on the scale that matters. Its your BMR. Here is some info on that and how to calculate yours. […]

    2. cat
      January 28, 2010 at 12:49 pm

      ok…i’ve heard it before, but it obviously didn’t sink in. Tell me again why eating less than you need to fuel your body (based on BMR) doesn’t help you lose weight, please.

      • Sal Marinello
        Sal Marinello
        February 1, 2010 at 7:15 pm

        If you under eat your body will rid itself of the tissue that burns calories – muscle. And chronic under eating creates an extremely unfavorable condition for your body, as your metabolism will adjust and actually work to hold on to body fat.
        When someone loses weight rapidly, especially the person who typically wants to lose 10-15 pounds, this weight loss comes in the form of mostly muscle. After a time, if this person binges and regains that 10-15 pounds, it is mostly fat. Repeated several times, this yo-yo dieting syndrome serves to make people less fit, slows the metabolism and results in diminished capacity.

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