TDEE stands for total daily energy expenditure: the total calories your body burns in 24 hours. You calculate it by estimating your BMR with the Mifflin-St Jeor formula and multiplying by an activity factor from 1.2 (sedentary) to 1.9 (extra active). Your TDEE is your maintenance calorie level, the number that keeps your weight stable. Try our online calorie deficit calculator to get your number in under a minute.
What Does TDEE Actually Mean?
Your body spends energy all day, even when you do nothing. TDEE adds up every calorie you burn across a full day: the energy to keep your organs running, the energy to digest food, the energy of walking to your car, and the energy of your workouts. If you eat exactly your TDEE, your weight stays the same. Eat below it and you lose weight. Eat above it and you gain.
This is why TDEE is the foundation of every calorie plan. BMR tells you what you burn at rest, but nobody lives at rest. TDEE completes the picture by adding real life on top.
What Are the Four Parts of TDEE?
Researchers break daily calorie burn into four components:
- BMR (basal metabolic rate), about 60 to 70 percent. The calories your body needs at complete rest for breathing, circulation, brain function, and cell repair. This is the biggest slice for almost everyone.
- NEAT (non-exercise activity thermogenesis), about 15 to 25 percent. All the movement that is not formal exercise: fidgeting, standing, walking around the house, typing, doing chores. This varies enormously between people and is the hidden driver of TDEE differences.
- TEF (thermic effect of food), about 10 percent. Digesting and processing food costs energy. Protein costs the most to digest (20 to 30 percent of its calories), followed by carbs (5 to 10 percent) and fat (0 to 3 percent).
- EAT (exercise activity thermogenesis), about 5 to 15 percent. Planned workouts. This is the smallest slice for most people, which surprises many gym-goers, but an hour of training is only one hour out of 24.
How Do You Calculate TDEE Step by Step?
The practical method has two steps. First, estimate BMR with Mifflin-St Jeor:
- Men: BMR = 10 x weight (kg) + 6.25 x height (cm) – 5 x age + 5
- Women: BMR = 10 x weight (kg) + 6.25 x height (cm) – 5 x age – 161
Second, multiply BMR by the activity factor that best describes your life:
| Activity Level | Factor | What It Looks Like |
|---|---|---|
| Sedentary | 1.2 | Desk job, under 5,000 steps a day, no exercise |
| Lightly active | 1.375 | Light exercise 1 to 3 days a week |
| Moderately active | 1.55 | Moderate exercise 3 to 5 days a week |
| Very active | 1.725 | Hard exercise 6 to 7 days a week |
| Extra active | 1.9 | Very hard training plus a physical job |
Can You Show a Full Worked Example?
Take a 33-year-old woman who weighs 75 kg (about 165 lb) and is 168 cm tall (about 5 ft 6 in), and who trains hard 6 days a week (very active, 1.725):
- BMR = 10 x 75 + 6.25 x 168 – 5 x 33 – 161
- BMR = 750 + 1,050 – 165 – 161 = 1,474 calories per day
- TDEE = 1,474 x 1.725 = 2,542.65, about 2,543 calories per day
Now compare: if she were sedentary, her TDEE would be 1,474 x 1.2 = 1,768.8, about 1,769 calories per day. Activity adds 2,543 – 1,769 = 774 calories per day, which is more than a full extra meal. This is why two people with the same BMR can have wildly different calorie needs.
Looking at the components for her active day: BMR (1,474) is 1,474 / 2,543 = 58 percent of her TDEE, TEF is roughly 10 percent (about 254 calories), and the remaining 32 percent comes from movement and training. For her sedentary version, BMR would be 1,474 / 1,769 = 83 percent of TDEE, showing how dominant resting burn becomes when you barely move.
How Does TDEE Change With Different Activity Levels?
Using a 35-year-old man, 80 kg, 180 cm (BMR = 1,755, as verified in our calculator tests):
- Sedentary: 1,755 x 1.2 = 2,106 calories per day
- Lightly active: 1,755 x 1.375 = 2,413.1, about 2,413 calories per day
- Moderately active: 1,755 x 1.55 = 2,720.25, about 2,720 calories per day
- Very active: 1,755 x 1.725 = 3,027.4, about 3,027 calories per day
- Extra active: 1,755 x 1.9 = 3,334.5, about 3,335 calories per day
The range from 2,106 to 3,335 is a 1,229-calorie spread for the exact same body. That spread is why honest activity selection matters more than formula choice.
How Accurate Is the TDEE Formula?
For most people it lands within 10 to 15 percent of the true value, which is close enough to start. The biggest error sources are the activity multiplier (people usually pick one level too high) and unusual body composition (very muscular people burn more than the formula predicts; the formula assumes average body fat).
The fix is simple: use the formula to set your starting target, then let the scale calibrate it. If your weight holds steady for two weeks, your real TDEE equals what you are eating. That observed number beats any formula.
How Do You Use TDEE for Weight Loss?
Once you know your TDEE, subtract your chosen deficit: 250 calories per day for 0.5 lb per week, 500 for 1 lb per week, 750 for 1.5 lb per week, or 1,000 for 2 lb per week. Using the active woman above (TDEE 2,543) with a 1-lb-per-week goal, her target is 2,543 – 500 = 2,043 calories per day. For maintenance, eat at TDEE. For muscle gain, eat 200 to 300 above it.
Frequently Asked Questions
What is a good TDEE for weight loss?
There is no universal good number. Calculate your own TDEE from your BMR and activity level, then subtract 250 to 1,000 calories per day depending on how fast you want to lose. The “good” TDEE is simply your personal maintenance level.
Is TDEE the same as maintenance calories?
Yes. Maintenance calories, maintenance level, and TDEE all mean the same thing: the daily calorie intake that keeps your current weight stable over time.
Does TDEE include exercise?
Yes. The activity multiplier bakes in your typical exercise and daily movement. That is why you should not add workout calories on top of a TDEE-based target unless your training goes well beyond what your multiplier already covers.
Why is my TDEE so low?
Smaller bodies, older age, and sedentary routines all lower TDEE. If your number looks surprisingly low, double-check that you did not pick too low an activity level, and remember the scale trend over two weeks tells you your real maintenance.
Can TDEE change over time?
Yes. Losing weight lowers BMR and movement costs, aging slowly lowers BMR, and long dieting periods can suppress NEAT as your body unconsciously moves less. Recalculate every 10 to 15 pounds lost or every couple of months.
Should I use an online TDEE calculator or do the math myself?
A calculator is faster and removes arithmetic mistakes, but doing the math once teaches you how the numbers connect. Either way, treat the result as a starting estimate and adjust based on your real weight trend.
