What Is TDEE and How Do You Calculate It?
TDEE — Total Daily Energy Expenditure — is the total calories your body burns each day. Here's how to calculate it using the Mifflin-St Jeor equation and activity multipliers, with worked examples.
What TDEE Means
TDEE stands for Total Daily Energy Expenditure — the total number of calories your body burns in a 24-hour period, accounting for everything: your resting metabolism, physical activity, and the energy used to digest food.
It's the number that matters most for managing weight:
- Eat below your TDEE → lose weight
- Eat at your TDEE → maintain weight
- Eat above your TDEE → gain weight
Use our Calorie Calculator to calculate your TDEE instantly.
The Two Components of TDEE
1. Basal Metabolic Rate (BMR) — calories burned at complete rest. This is the energy your body needs just to maintain organ function: breathing, circulation, cell repair. BMR accounts for 60–75% of most people's TDEE.
2. Activity factor — a multiplier applied to BMR based on your lifestyle and exercise habits. The more active you are, the higher the multiplier.
TDEE = BMR × Activity Multiplier
Calculating BMR: The Mifflin-St Jeor Equation
The Mifflin-St Jeor equation is currently the most accurate BMR formula for most adults:
Men: BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age) + 5
Women: BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age) − 161
Example — 30-year-old woman, 65 kg, 165 cm: BMR = (10 × 65) + (6.25 × 165) − (5 × 30) − 161 BMR = 650 + 1,031 − 150 − 161 BMR = 1,370 calories/day
Activity Multipliers
Once you have BMR, multiply by your activity level:
| Activity Level | Multiplier | Description |
|---|---|---|
| Sedentary | × 1.2 | Desk job, little or no exercise |
| Lightly active | × 1.375 | Light exercise 1–3 days/week |
| Moderately active | × 1.55 | Moderate exercise 3–5 days/week |
| Very active | × 1.725 | Hard exercise 6–7 days/week |
| Extremely active | × 1.9 | Physical job + daily exercise |
Continuing the example — lightly active: TDEE = 1,370 × 1.375 = 1,884 calories/day
This woman needs approximately 1,884 calories per day to maintain her current weight.
TDEE at Different Activity Levels (Same Person)
| Activity Level | TDEE |
|---|---|
| Sedentary | 1,644 cal |
| Lightly active | 1,884 cal |
| Moderately active | 2,124 cal |
| Very active | 2,363 cal |
| Extremely active | 2,603 cal |
The difference between sedentary and very active is 719 calories/day — almost a full extra meal. This is why activity level is the biggest lever you control for weight management.
TDEE vs Calories on Food Labels
Food labels in the US use a reference value of 2,000 calories/day. This is a population average, not your personal TDEE. Depending on your age, sex, size, and activity level, your actual TDEE may be anywhere from 1,400 to 3,500+ calories/day.
Basing dietary decisions on the label reference rather than your personal TDEE is one reason generic diets often fail — they're calibrated for an average that may not resemble you.
Using TDEE for Weight Goals
Once you know your TDEE, setting a calorie target is straightforward:
- Lose ~0.5 kg/week: Eat TDEE − 500 cal/day (1 lb ≈ 3,500 cal deficit)
- Lose ~0.25 kg/week: Eat TDEE − 250 cal/day (slower, more sustainable)
- Gain ~0.5 kg/week: Eat TDEE + 300–500 cal/day
For more detail on calorie targets for weight loss, see: How Many Calories Should You Eat to Lose Weight?
Conclusion: Key Takeaways
- TDEE = total daily calories burned = BMR × activity multiplier
- Mifflin-St Jeor formula is the most accurate BMR equation for most adults
- Activity level is the biggest variable you control — sedentary vs very active differs by ~700 cal/day
- TDEE = calories in = weight maintenance; below = loss; above = gain
- Food label 2,000 cal reference is a population average, not your personal TDEE