What is TDEE?
Updated June 3, 2026
TDEE means Total Daily Energy Expenditure. It is an estimate of how many calories you burn in a normal day after resting metabolism, movement, training, and digestion are included.
The simple version
If your body weight stays mostly stable while eating around the same calories each day, those calories are close to your real maintenance intake. A TDEE calculator tries to estimate that number before you spend weeks testing it manually.
For example, if your estimated TDEE is 2,500 calories, eating near 2,500 calories may maintain weight. Eating below it may produce weight loss. Eating above it may support weight gain.
What goes into TDEE
Most TDEE estimates start with BMR, or basal metabolic rate. BMR is the estimated energy your body uses at rest. The calculator then applies an activity multiplier to account for normal movement and exercise.
The activity multiplier is the rough part. Two people with the same height, weight, age, and sex can burn different amounts because of job activity, walking, training volume, sleep, body composition, and habit.
How to use it
Use TDEE as a starting point, not a verdict. Run the TDEE calculator, follow the target consistently for two to three weeks, then compare the result with your scale trend and training performance.
If weight is not changing as expected, adjust by a small amount rather than assuming the formula failed. A 100 to 200 calorie adjustment is often easier to evaluate than a large swing.