What is TDEE? Your maintenance calories explained
TDEE explained simply: what Total Daily Energy Expenditure means, how BMR and activity combine into it, and how to use your TDEE to lose, maintain or gain weight.
TDEE is one of the most useful numbers in fitness, and once you understand it, calories stop being mysterious. It is simply how much energy your body burns in a day. Get that number and every weight goal becomes a clear math problem.
The short version: TDEE is your Total Daily Energy Expenditure, the calories you burn per day. Eat at it to maintain, below it to lose, above it to gain. It is your BMR multiplied by an activity factor.
What TDEE is made of
Your TDEE has a few components, but two matter most:
- BMR (basal metabolic rate): the calories your body burns at complete rest, just to keep your heart beating, lungs breathing, and cells working. It is the biggest chunk, often 60 to 70 percent of the total.
- Activity: everything you do on top of resting, from walking to the kitchen to a hard workout. This is why an active person has a higher TDEE than a sedentary person of the same size.
Put simply: TDEE = BMR x an activity multiplier. The multiplier ranges from about 1.2 for sedentary to around 1.9 for very active people with physical jobs.
How TDEE is calculated
The most accurate general formula for BMR is Mifflin-St Jeor, which uses your sex, age, height, and weight. Then an activity factor scales it up to your TDEE. You do not need to do the math yourself: the TDEE calculator does it and shows your maintenance calories plus targets for losing or gaining.
Why your TDEE is the key number
Weight change is energy in versus energy out. Your TDEE is the “out” side. Once you know it:
- Eat at your TDEE and your weight holds steady.
- Eat below it (a deficit) and you lose weight. About 500 calories below per day is roughly a pound a week.
- Eat above it (a surplus) and you gain.
That is the entire foundation of any diet, stripped of the marketing. Everything else, low-carb, keto, intermittent fasting, is just a different way of getting you to eat below your TDEE. See how to apply it in how many calories to lose weight.
TDEE changes over time
Your TDEE is not fixed. As you lose weight, a smaller body burns fewer calories, so your TDEE drops and the deficit you set at the start shrinks. That is why weight loss naturally slows and why you should recalculate every 10 to 15 pounds. It also rises if you gain muscle or become more active.
Use it, then track it
The calculator gives you an excellent estimate, but formulas describe averages, not you specifically. Treat your TDEE as a starting hypothesis: eat to it (or to a deficit) and track your weight for two weeks. If reality matches the prediction, great. If not, adjust. Our weight loss motivation planner makes that daily tracking quick so you can dial in your real numbers.
Start by finding yours with the TDEE calculator, then use it to set a target you can actually live with.
This guide is general information, not medical advice.
Frequently asked questions
What does TDEE mean?
TDEE stands for Total Daily Energy Expenditure, the total number of calories your body burns in a day. It includes your resting metabolism plus all your movement and exercise. Eating at your TDEE keeps your weight stable.
What is the difference between TDEE and BMR?
BMR (basal metabolic rate) is what you burn at complete rest, just keeping your body running. TDEE takes that BMR and multiplies it by an activity factor to include daily movement and exercise, so TDEE is always higher than BMR.
How accurate is a TDEE calculator?
TDEE formulas estimate the average person and are typically within about 10 percent for most people. Use the number as a starting point, then track your intake and weight for a couple of weeks and adjust based on what actually happens.
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