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About TDEE Calculator Site

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Formulas Used

We calculate all the TDEE Calculations using the Mifflin-St Jeor formula to calculate an estimate of your Basal Metabolic Rate, and then we adjust the numbers to take your activity level into account.

Mifflin-St Jeor Equation

Mifflin = (10.m + 6.25h - 5.0a) + sm is mass in kg, h is height in cm, a is age in years, s is +5 for males and -151 for females

Katch-McArdle Equation

Optionally, if you fill out the body fat percentage field, the calculator will instead use the Katch-McArdle Formula, which is the most accurate formula of all. If you don’t know your body fat %, you can pick up a pair of cheap body fat calipers online, or find a place (try University Health departments) that offers DEXA scans. DEXA scans are the gold-standard in determining your body fat percentage and generally cost between $50 – $100.

Katch = 370 + (21.6 * LBM)where LBM is lean body mass

Revised Harris-Benedict Equation

The revised Harris-Benedict equation has been in use since 1984, and we calculate this as well for those who want it.

Harris-Benedict = (13.397m + 4.799h - 5.677a) + 88.362 (MEN)
Harris-Benedict = (9.247m + 3.098h - 4.330a) + 447.593 (WOMEN)
m is mass in kg, h is height in cm, a is age in years