We are pleased to announce that as of March 4, 2025, an updated Rich Text Editor has been introduced in the MyFitnessPal Community. To learn more about the changes, please click here. We look forward to sharing this new feature with you!

20% of TDEE is less than BMR?

bbbrittingham
bbbrittingham Posts: 7 Member
edited January 26 in Health and Weight Loss
Hi All -

Someone posted this calculator earlier, so I entered my info: http://thefitgirls.com/tdee-calculator.aspx

I'm a 27 year old female, 5'6", 145 lbs, and get little to no exercise (I know, I know). This calculator shows my TDEE at 1755 and my BMR at 1463.

I'm aware of 2 general rules of thumb: 1) eat about 80% of your TDEE and 2) eat somewhere between your BMR and your TDEE. Well, according to the 80% rule, I should eat 1404 cals a day...which, clearly, is less than my BMR.

So should I go with 1400? Or up it? As a side note, MFP puts me at 1200 a day. Some days I can do 1200, other days are really tough.

FWIW, I only want to lose about 10-15 lbs.

Replies

  • girlinahat
    girlinahat Posts: 2,956 Member
    given that you only have 10-15lbs to lose you'd be better off doing TDEE - 15% or even 10%.

    plus add in some regular exercise.
  • NJD2885
    NJD2885 Posts: 216 Member
    When you have a small amount to lose do TDEE minus 10 or 15 %
  • bbbrittingham
    bbbrittingham Posts: 7 Member
    Thanks for your answers!
  • yarwell
    yarwell Posts: 10,477 Member
    I'm aware of 2 general rules of thumb: 1) eat about 80% of your TDEE and 2) eat somewhere between your BMR and your TDEE. Well, according to the 80% rule, I should eat 1404 cals a day...which, clearly, is less than my BMR.

    If you put in sedentary (ie TDEE = BMR + 20%) then TDEE - 20% will be less than BMR. It's mathematics.

    2) is basically BS, and mathematically incompatible with 1 for sedentary people who don't exercise. MFP comes to the rescue with eating back calories to push up your intake.
This discussion has been closed.