- TDEE is the total number of calories your body burns in a full day, including rest, movement, exercise, and digestion.
- Eating at your TDEE keeps your weight stable. Eating below it leads to weight loss, and eating above it leads to weight gain.
- The calculator uses the Mifflin-St Jeor equation, which is accurate within about 10% for most healthy adults.
- Your TDEE changes over time, so it's worth recalculating when your weight or activity level shifts.
What Is TDEE?
TDEE stands for Total Daily Energy Expenditure. It's the total number of calories your body uses over 24 hours to keep you alive, move around, exercise, and digest food. If you eat exactly this amount day after day, your weight should stay about the same.
Think of it as your daily energy budget. Spend less than you earn and you store the extra. Spend more than you earn and your body pulls from its reserves. Knowing your TDEE tells you where the balance point is, so you can decide how far above or below it you want to go.
TDEE is not the same for everyone. A 180-pound desk worker and a 180-pound delivery driver who walks all day can have very different numbers, even though the scale says the same thing. That's why a personal estimate beats any generic "2,000 calories a day" rule.
What Makes Up Your TDEE?
Your TDEE is the sum of four parts. Understanding them helps you see which ones you can actually change.
| Component | What It Is | Share of TDEE |
|---|---|---|
| BMR (Basal Metabolic Rate) | Calories burned at complete rest for breathing, circulation, and cell repair | 60-75% |
| NEAT (Non-Exercise Activity Thermogenesis) | Walking, standing, chores, fidgeting, and everyday movement | 15-20% |
| TEF (Thermic Effect of Food) | Energy used to digest and absorb what you eat | 8-10% |
| EAT (Exercise Activity Thermogenesis) | Planned workouts like lifting, running, or sports | 5-10% |
Most people assume exercise drives their calorie burn. In reality, your resting metabolism and everyday movement do most of the work. This is why someone who trains for an hour but sits for the other 15 waking hours may burn less than they expect.
How Does the TDEE Calculator Work?
The calculator follows the same process a dietitian would use, just faster.
Step 1: Enter your personal details. Age, gender, height, and weight. These four inputs set the foundation because they determine how much energy your body needs at rest.
Step 2: The calculator finds your BMR. It uses the Mifflin-St Jeor equation to estimate the calories you'd burn if you did nothing but lie in bed all day.
Step 3: Choose your activity level. You pick the option that best matches your typical week, from sedentary to extremely active. Each option has a multiplier that scales your BMR up to account for movement.
Step 4: Get your TDEE. The calculator multiplies your BMR by your activity multiplier and shows your estimated daily calorie burn.
TDEE Formula
The calculation has two parts. First, your BMR using Mifflin-St Jeor:
Then multiply by your activity factor:
| Activity Level | Description | Multiplier |
|---|---|---|
| Sedentary | Little or no exercise, desk job | 1.2 |
| Lightly Active | Light exercise 1-3 days per week | 1.375 |
| Moderately Active | Moderate exercise 3-5 days per week | 1.55 |
| Very Active | Hard exercise 6-7 days per week | 1.725 |
| Extremely Active | Intense daily training or a physical job plus exercise | 1.9 |
Example 1: Male
A 30-year-old man who weighs 80 kg (176 lbs), is 178 cm (5'10") tall, and exercises moderately:
Example 2: Female
A 28-year-old woman who weighs 65 kg (143 lbs), is 165 cm (5'5") tall, and exercises lightly:
Katch-McArdle for People Who Know Their Body Fat
If you know your body fat percentage, the Katch-McArdle formula can give a sharper estimate because it uses lean body mass instead of total weight:
This is especially useful for very muscular people or those with a higher body fat percentage, where standard formulas can miss the mark by a few hundred calories.
How to Choose the Right Activity Level
This is where most people go wrong. Picking the wrong level can throw your TDEE off by 200 to 400 calories, and that's enough to stall progress for months.
| If This Sounds Like You | Pick This |
|---|---|
| Desk job, few steps, no workouts | Sedentary |
| Desk job plus 1-3 light workouts or regular walks | Lightly Active |
| 3-5 solid gym or sports sessions per week | Moderately Active |
| Hard training almost every day | Very Active |
| Athlete, or a labor-heavy job plus training | Extremely Active |
A simple rule: if you're between two levels, choose the lower one. Most people overestimate how active they are. Someone who trains three times a week but sits for 8 hours a day is usually "Lightly Active," not "Moderately Active."
TDEE by Activity Level: Typical Ranges
These are rough averages to help you sanity-check your result. Your own number depends on your size, age, and body composition.
| Activity Level | Men (approx.) | Women (approx.) |
|---|---|---|
| Sedentary | 1,800-2,200 | 1,400-1,800 |
| Lightly Active | 2,100-2,500 | 1,700-2,000 |
| Moderately Active | 2,400-2,800 | 1,900-2,200 |
| Very Active | 2,800-3,200 | 2,200-2,500 |
| Extremely Active | 3,200-3,800+ | 2,500-3,000+ |
How to Use Your TDEE for Your Goal
Once you have your number, the next step is deciding what to do with it.
| Goal | Daily Calories | What to Expect |
|---|---|---|
| Maintain weight | Your TDEE | Weight stays stable |
| Steady fat loss | TDEE minus 15-25% | Roughly 0.5-1 lb (0.25-0.45 kg) lost per week |
| Lean muscle gain | TDEE plus 5-15% | Slow, controlled gain with minimal fat |
| Body recomposition | TDEE within 100-200 calories | Gradual fat loss and muscle gain together |
For example, if your TDEE is 2,500 calories and you want to lose about a pound a week, eating around 2,000 calories creates a 500-calorie daily deficit. If you'd rather build muscle, 2,750 to 2,800 calories gives you a lean surplus.
If you want the exact numbers for your goal, our Calorie Deficit Calculator and Calorie Surplus Calculator do the math for you.
TDEE vs BMR vs RMR
These terms get mixed up a lot, so here is the short version.
| Term | Meaning |
|---|---|
| BMR | Calories burned at complete rest, measured under strict conditions |
| RMR | Calories burned at rest in a relaxed, non-fasted state. Usually very close to BMR |
| TDEE | BMR plus all daily activity and digestion. The number you actually eat around |
BMR is the floor, and TDEE is the full picture. You should never eat below your BMR for long stretches, but your TDEE is what tells you how much you can eat to hold your weight. You can check the first two with our BMR Calculator and RMR Calculator.
How Accurate Is a TDEE Calculator?
A good TDEE calculator gets you close, but no formula can measure your exact metabolism. Mifflin-St Jeor is accurate within about 10% for most healthy adults. If your estimate is 2,500 calories, your real number could sit anywhere between 2,250 and 2,750.
Here is what causes the gap:
- Genetics and natural differences in metabolism
- Thyroid function and other hormones
- Muscle mass, which standard formulas don't measure
- Past dieting, which can lower metabolic rate over time
- Guessing your activity level too high or too low
Treat your result as a starting point, not a final answer. The next section shows how to fine-tune it.
How to Find Your Real TDEE
The most reliable method is to test your estimate in real life.
- Calculate your TDEE using the tool above.
- Eat at that number for 2 to 3 weeks. Use a food scale and a tracking app so your logging is accurate.
- Weigh yourself every morning under the same conditions, and look at your weekly average instead of daily numbers.
- Check the trend. Stable weight means you've found your TDEE. Rising weight means your true number is lower, so cut 100-200 calories and retest. Falling weight means your true number is higher, so add 100-200 calories and retest.
Daily weight can swing by several pounds from water, salt, and carbs, so never judge progress from a single morning.
Common TDEE Mistakes
Overestimating activity. This is the number one error. If in doubt, go one level lower.
Adding workout calories on top of the multiplier. The activity multiplier already includes your exercise. Adding a fitness watch estimate on top counts the same burn twice.
Never recalculating. Your TDEE drops as you lose weight, so a deficit that worked at 200 lbs may stall at 180.
Trusting one week of data. Give any calorie target at least two weeks before you change it.
Using the result for children. Adult formulas aren't validated for people under 18.
When Should You Recalculate Your TDEE?
Your TDEE isn't fixed. Update it:
- Every 10-15 lbs of weight change
- Every 3-6 months, or whenever your training or job changes
- After an injury, illness, or major lifestyle change
- If your weight moves in an unexpected direction for more than two weeks
Who Should Be Careful With This Calculator?
The calculator is built for healthy adults. If you're pregnant or breastfeeding, under 18, managing a medical condition, or recovering from an eating disorder, talk to a doctor or registered dietitian before changing your calorie intake. Your needs are different, and a general estimate may not be safe or accurate for you.