What Is TDEE? Total Daily Energy Expenditure Explained

Where BMR counts only what your body spends at rest, TDEE counts the whole day: sleeping, sitting, walking to the shop, training, and digesting your food. It is the number most calorie targets are built around. If you eat roughly your TDEE for long enough, your weight should stay roughly where it is. Eat below it and the target becomes a deficit; eat above it and it becomes a surplus.

You will also see this called maintenance calories. The two phrases describe the same quantity from two angles: TDEE is the measurement, and maintenance is what you do with it.

How CalorTracker estimates it

The estimate is a single multiplication: TDEE = BMR × an activity multiplier, rounded to a whole number. The BMR comes from the Mifflin-St Jeor equation described on the BMR page. The multiplier is chosen from five conventional levels that describe how much you move in a typical week:

These factors are long-standing conventions, not measurements of you. They describe an average person at each level, which is why the result is a starting point rather than a verdict. The method is on how we calculate.

Worked example

Use the same man as on the BMR page: aged 30, 80 kg, 180 cm, with a BMR of 1,780 kcal. At each activity level the TDEE calculator gives:

The man in the example trains on several days a week, so the moderate row, 2,759 kcal, is his estimate. The gap between the lowest and highest rows is 1,246 kcal a day for the very same body. That is the single most useful thing to notice about TDEE: the activity choice moves the answer more than any other input.

Choosing a level honestly

People tend to rate themselves one level higher than their week supports, because a workout feels like a lot of movement. If you are unsure between two levels, the lower one is the more cautious starting guess, since you can raise the target later if your weight drops faster than you meant it to.

What TDEE does not tell you

TDEE is an estimate of an average day, and real days vary. It assumes the multiplier fits you, which no equation can confirm. The best check is your own record: log your food and weigh yourself for a few weeks, and compare. If your weight is steady while you eat about the estimate, the estimate fits. If it drifts, adjust the target and keep measuring.

For a gentler or faster plan, start from TDEE and move by a fixed amount, as explained in calorie deficit and calorie surplus. The calorie calculator does that step for you. All of this is general information, and anyone managing a health condition should plan with a doctor or registered dietitian.