What Is TDEE?
Your Total Daily Energy Expenditure (TDEE) is the total number of calories your body burns in a day — factoring in your metabolism, daily activity, and exercise. It's the single most important number for anyone trying to manage their weight, because it tells you your maintenance calories: the amount you need to eat just to stay the same weight.
- Eat below your TDEE → lose weight
- Eat at your TDEE → maintain weight
- Eat above your TDEE → gain weight
Step 1: Calculate Your BMR
Your Basal Metabolic Rate (BMR) is how many calories your body burns at complete rest — just to keep you alive (breathing, circulation, organ function). The most commonly used formula is the Mifflin-St Jeor equation:
For Men:
BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age in years) + 5
For Women:
BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age in years) − 161
Example:
A 35-year-old woman, 165 cm tall, weighing 75 kg:
BMR = (10 × 75) + (6.25 × 165) − (5 × 35) − 161 = 750 + 1031.25 − 175 − 161 = 1,445 calories
Step 2: Apply Your Activity Multiplier
BMR only accounts for rest. To estimate your TDEE, multiply your BMR by the activity factor that best describes your lifestyle:
| Activity Level | Description | Multiplier |
|---|---|---|
| Sedentary | Desk job, little to no exercise | × 1.2 |
| Lightly active | Light exercise 1–3 days/week | × 1.375 |
| Moderately active | Moderate exercise 3–5 days/week | × 1.55 |
| Very active | Hard exercise 6–7 days/week | × 1.725 |
| Extremely active | Physical job + hard daily exercise | × 1.9 |
Using the example above, if she exercises moderately 3–4 times a week:
TDEE = 1,445 × 1.55 = ~2,240 calories/day
Step 3: Set Your Calorie Target
Now that you have your TDEE, you can set a sensible calorie target:
- For weight loss: Subtract 300–500 calories from your TDEE. This creates a moderate deficit that's sustainable. (Avoid going more than 500 below — it's unnecessary and harder to maintain.)
- For maintenance: Eat at your TDEE.
- For muscle gain: Add 200–300 calories above your TDEE.
Important Caveats
TDEE calculators are estimates, not precise measurements. Your actual calorie needs can vary based on:
- Gut microbiome and individual metabolic differences
- Hormonal factors (thyroid function, insulin sensitivity)
- Non-exercise activity thermogenesis (NEAT) — fidgeting, walking, daily movement
- Sleep quality and stress levels
Treat your calculated TDEE as a starting point. Track your weight for 2–3 weeks and adjust if needed — if you're not losing weight on a 500-calorie deficit, you may have overestimated your activity level.
Using TDEE Without Obsessing Over It
You don't need to count calories forever. Once you've used TDEE calculations to build awareness of portion sizes and food composition, many people transition to intuitive, mindful eating while maintaining their results. The goal is education, not permanent tracking.
Quick Reference: TDEE in Practice
- Calculate your BMR using the Mifflin-St Jeor formula
- Multiply by your activity level
- Subtract 300–500 for a weight loss deficit
- Track for 2–3 weeks, then adjust based on actual results
- Revisit your TDEE every 5–10 lbs of weight change