Calculation method for BMR & TDEE

mariposa224

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.

joejccva71

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

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

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

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

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

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! I bookmarked this time. :laugh:

TrainingWithTonya

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