Hi! Can someone help me with my TDEE please?

[Majka]

Hi!  So I used the TDEE calculator on iifym.com and mayo clinic.  Iifym said that my TDEE is 1250 and Mayo clinic said it was 1450 even though for both I entered sedentary.  I am 28, female, 5'3'' 86 lb and I'm not sure which is right, can you please tell me?  Thanks so much and happy holidays!

[Dominique]

I personally like to use this calculator, which relies on the Mifflin St. Jeor formula (= more or less the same used by Fitbit). With your parameters (F/28/5’3/86) BMR is 1089 and TDEE with sedentary as activity level is 1307. Do you know what formula is being used by the calculators you mentioned?

[Majka]

HI Dominique, thank you!!  You sound really knowledgeable!! 🙂  I have no idea about the formulas but I guess 1307 sounds good! 🙂 🙂  Have a woooonderful Decembeer and holiday season 🙂

[Dominique]

You’re welcome! Formulas (e.g. Mifflin St. Jeor, Harris Benedict, Katch McArdle) are one thing, but TDEE is something your Fitbit should be able to tell you, providing you are wearing it 24/7. What model do you have and what does it say you’re burning during very low (e.g. less than 4000 steps) and very high (e.g. 20,000 steps) activity days?