Calculation method for BMR & TDEE

mariposa224
mariposa224 Posts: 1,241 Member
edited December 2024 in Health and Weight Loss
OK, I had this previously, but I never wrote it down or saved it anywhere to be able to look back... Can someone please give me the actual calculations used to calculate BMR & TDEE? I've tried a few different sites, but I would like to do the actual math myself to be certain. I tried searching topics, but there are so many related to BMR & TDEE it would take me days to wade through them all to just find the actual formula.

Thanks in advance. :smile:

Replies

  • joejccva71
    joejccva71 Posts: 2,985 Member
    It's all estimations but the fastest way is to multiply your bodyweight by your activity level. If you train 5 days a week for 60 mins plus have a normal active life then it's your bw * 15-16. If you are more sedentary, then bw * 13-14. Etc.

    Science:
    TDEE = BMR + TEF + NEAT + EAT

    BMR = Basal Metabolic Rate (calories burned while comatose)
    TEF = Thermal Effect of Feeding (calories burned with the process of eating macronutrient content)
    NEAT = Non-Exercise Associated Thermogenesis (unplanned exercise)
    EAT = Exercise Associated Thermogenesis (planned exercise)


    Or...spend $170-200 and buy a Bodymedia FIT or Bodybugg device. Not 100% but fairly accurate.
  • yarwell
    yarwell Posts: 10,477 Member
    In most situations, the BMR is estimated with equations summarized from statistical data. The most commonly used one is the Mifflin - St Jeor equation:

    BMR = 10 * weight(kg) + 6.25 * height(cm) - 5 * age(y) + 5 (man)
    BMR = 10 * weight(kg) + 6.25 * height(cm) - 5 * age(y) - 161 (woman)
  • joejccva71
    joejccva71 Posts: 2,985 Member
    In most situations, the BMR is estimated with equations summarized from statistical data. The most commonly used one is the Mifflin - St Jeor equation:

    BMR = 10 * weight(kg) + 6.25 * height(cm) - 5 * age(y) + 5 (man)
    BMR = 10 * weight(kg) + 6.25 * height(cm) - 5 * age(y) - 161 (woman)

    Miffin - St Jeor overestimates needs especially for people overweight or obese. Katch-McArdle is more accurate but you need to have a decent estimate of your bf% to be most accurate.
  • mariposa224
    mariposa224 Posts: 1,241 Member
    In most situations, the BMR is estimated with equations summarized from statistical data. The most commonly used one is the Mifflin - St Jeor equation:

    BMR = 10 * weight(kg) + 6.25 * height(cm) - 5 * age(y) + 5 (man)
    BMR = 10 * weight(kg) + 6.25 * height(cm) - 5 * age(y) - 161 (woman)

    Miffin - St Jeor overestimates needs especially for people overweight or obese. Katch-McArdle is more accurate but you need to have a decent estimate of your bf% to be most accurate.

    I have a decent estimate of my bf%, but the formula that you gave for Keith-McArdle doesn't have numbers in it. I'm looking for numbers. I know my height, weight, and age, obviously, so using the Miffin-St.Jeor method would be easier from the information given. I actually think that's the one I used when I did the calculations last month (by looking at the numbers I *did* write down and doing the reverse-math). I've been losing, I just want to make sure I keep it in line as my weight goes down.

    According to M-SJ, my BMR would be 1355, which is lower than what the sites are calculating for me (all of them were over 1400). According to what you said for K-M, my TDEE would be 2247-2396.8. That's higher than my TDEE was last month when I weighed more (it was 2061.15 then). I work out 6 days a week, but I've always used the "moderate" level for calculating. So... Now I'm even more confused...
  • yarwell
    yarwell Posts: 10,477 Member
    Miffin - St Jeor overestimates needs especially for people overweight or obese.
    Agreed. Was in a rush, here's more links :-

    http://www.ajdesigner.com/phpweightloss/weight_loss_equations_men_women_metabolic_rate_bmr_calorie_day.php

    http://en.wikipedia.org/wiki/Basal_metabolic_rate#BMR_estimation_formulas
  • mariposa224
    mariposa224 Posts: 1,241 Member
    Miffin - St Jeor overestimates needs especially for people overweight or obese.
    Agreed. Was in a rush, here's more links :-

    http://www.ajdesigner.com/phpweightloss/weight_loss_equations_men_women_metabolic_rate_bmr_calorie_day.php

    http://en.wikipedia.org/wiki/Basal_metabolic_rate#BMR_estimation_formulas

    Thank you! :smile: I bookmarked this time. :laugh:
  • TrainingWithTonya
    TrainingWithTonya Posts: 1,741 Member
    You can also check my Blog ( http://www.myfitnesspal.com/blog/TrainingWithTonya ) where I outlined what I was taught as a simpler formula from the ACSM.
    16 years Certified Personal Trainer and Group Exercise Instructor
    9 years Certified Sports Nutritionist
    Bachelors in Exercise Physiology with a Minor in Nutritional Science
    ACSM Certified Clinical Exercise Specialist
    NSCA Certified Strength and Conditioning Specialist
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