What is TDEE?
TDEE (Total Daily Energy Expenditure) is the total number of calories your body spends in a full day. It’s the most important figure for managing your weight, whether your goal is fat loss, maintenance, or muscle gain.
Understanding your TDEE means understanding the fundamental equation of weight management:
- Eating less than your TDEE = weight loss
- Eating as much as your TDEE = weight maintenance
- Eating more than your TDEE = weight gain
It’s that simple. No miracle diet, no magic solution. Just math.
The components of TDEE
Your total daily energy expenditure breaks down into 4 elements:
1. Basal Metabolic Rate (BMR) — 60 to 70%
BMR (Basal Metabolic Rate) represents the calories burned at rest to maintain vital functions: breathing, blood circulation, temperature regulation, and organ function.
This is the largest share of your daily caloric expenditure.
2. Thermic Effect of Food (TEF) — 10%
Digesting and absorbing food consumes energy. Proteins have the highest thermic effect (20-30% of consumed calories), followed by carbohydrates (5-10%) and fats (0-3%).
3. Exercise Activity Thermogenesis (EAT) — 15 to 30%
All your sports activities: weightlifting, cardio, group classes, etc.
4. Non-Exercise Activity Thermogenesis (NEAT) — Variable
All daily activities: walking, climbing stairs, fidgeting in your chair, doing housework. NEAT can vary from 200 to 900 calories per day between individuals, making it a powerful lever for weight management.
| Component | Share of TDEE | Example (for a TDEE of 2500 kcal) |
|---|---|---|
| BMR | 60-70% | 1500-1750 kcal |
| TEF | ~10% | 250 kcal |
| EAT (exercise) | 15-30% | 375-750 kcal |
| NEAT (daily activity) | Variable | 200-500 kcal |
TDEE vs BMR: what’s the difference?
Confusion between TDEE and BMR is very common. Here’s the distinction:
| BMR | TDEE | |
|---|---|---|
| Definition | Calories at strict rest | Total calories over 24h |
| Includes exercise | No | Yes |
| Includes digestion | No | Yes |
| Use | Calculation base | Dietary target |
Never confuse the two. If your BMR is 1600 kcal and you only eat 1600 kcal, you’ll likely be in too large a deficit (your actual TDEE is higher). This can harm your performance and recovery.
How to calculate your TDEE: step by step
Step 1: Calculate your BMR (Mifflin-St Jeor)
The Mifflin-St Jeor formula is considered the most accurate:
Men: BMR = (10 x weight in kg) + (6.25 x height in cm) – (5 x age) + 5
Women: BMR = (10 x weight in kg) + (6.25 x height in cm) – (5 x age) – 161
Example for a man weighing 80 kg, 178 cm tall, 28 years old: BMR = (10 x 80) + (6.25 x 178) – (5 x 28) + 5 = 800 + 1112.5 – 140 + 5 = 1777 kcal
Step 2: Apply the activity factor
| Activity level | Factor | Description |
|---|---|---|
| Sedentary | x 1.2 | Desk job, < 5,000 steps/day |
| Lightly active | x 1.375 | 5,000-7,500 steps/day, 1-2 sessions/week |
| Moderately active | x 1.55 | 7,500-10,000 steps/day, 3-5 sessions/week |
| Very active | x 1.725 | 10,000-15,000 steps/day, 6-7 sessions/week |
| Extremely active | x 1.9 | 15,000+ steps/day, 2 sessions/day |
Example (BMR of 1777 kcal, moderately active): TDEE = 1777 x 1.55 = 2754 kcal
Step 3: Use our calculator
To save time and be more precise, use our free TDEE calculator. It automatically applies the Mifflin-St Jeor formula with activity factors adjusted for your daily steps and workout sessions.
How to use your TDEE based on your goal
Weight loss
Subtract 200 to 300 calories from your TDEE. A moderate deficit allows you to lose 0.3 to 0.5 kg per week while preserving muscle mass. Check our weight loss workout program for a complete plan.
Maintenance
Eat exactly at your TDEE. Useful after a weight loss phase to stabilize your metabolism.
Muscle gain
Add 200 to 300 calories above your TDEE. A moderate surplus promotes muscle growth with minimal fat gain.
Common mistakes when calculating TDEE
1. Overestimating your activity level
Most people classify themselves as “very active” when they’re actually “moderately active.” Be honest with yourself, or better yet, count your steps with a pedometer.
2. Not recalculating regularly
Your TDEE changes with your weight and body composition. Recalculate every 4 to 6 weeks.
3. Ignoring NEAT
Daily walking and everyday activities represent a significant portion of your expenditure. Increasing your daily steps is one of the simplest ways to raise your TDEE.
4. Relying solely on the calculation
The calculated TDEE is a starting estimate. Adjust based on your real results: if you’re not losing weight after 2 weeks, reduce by 100 kcal. If you’re losing too fast, increase slightly.
Further reading
- Free TDEE calculator — Calculate your TDEE in a few clicks
- Lucas Gouiffes’ calorie calculation method — The detailed method with the Mifflin-St Jeor equation
- Weight loss workout program — How to use your TDEE to lose fat through strength training
Frequently asked questions (FAQ)
What is TDEE?
TDEE (Total Daily Energy Expenditure) is the total number of calories your body burns in a day. It includes your basal metabolic rate, exercise, daily movement and digestion.
How do I calculate my TDEE?
Calculate your basal metabolic rate with the Mifflin-St Jeor formula, then multiply it by your activity factor: 1.2 sedentary, 1.375 lightly active, 1.55 moderately active, 1.725 very active. The free TDEE calculator on rpgfitness.fr does it automatically.
What is the difference between TDEE and BMR?
BMR is the calories you burn at complete rest. TDEE adds all of your daily activity on top. TDEE is therefore always higher than BMR.
How many calories should I eat to lose weight based on my TDEE?
Subtract 300 to 500 kcal from your TDEE for gradual fat loss while keeping protein high. To build muscle, add 200 to 300 kcal instead.
Does TDEE change over time?
Yes. It changes with your weight, age, muscle mass and activity level. Recalculate it every 4 to 6 weeks or after a major change.
How can I increase my TDEE?
Move more: daily walking, regular strength training and more everyday activity. An app like RPG Fitness helps you stay consistent by turning every workout into XP and loot in a role-playing game.