TDEE in One Sentence
Your TDEE (Total Daily Energy Expenditure) is the total number of calories your body burns in a 24-hour period — including breathing, digesting food, walking to the fridge, and your workout.
- Eat below your TDEE → lose weight
- Eat at your TDEE → maintain weight
- Eat above your TDEE → gain weight
It’s that simple. Every diet that works creates a calorie deficit relative to TDEE. Every bulk that works creates a surplus.
How TDEE Is Calculated
TDEE has four components:
| Component | % of TDEE | What It Is |
|---|---|---|
| BMR (Basal Metabolic Rate) | 60-70% | Calories burned just being alive (breathing, organs, brain) |
| TEF (Thermic Effect of Food) | 8-15% | Energy spent digesting food |
| NEAT (Non-Exercise Activity) | 15-30% | Walking, fidgeting, standing, daily movement |
| EAT (Exercise Activity) | 5-10% | Intentional exercise |
Most people overestimate how much exercise matters and underestimate NEAT. A desk worker who exercises 1 hour/day is still sedentary for 23 hours.
Step 1: Calculate Your BMR
The Mifflin-St Jeor equation (most accurate for most people):
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: 30-year-old male, 5’10” (178 cm), 180 lbs (82 kg)
BMR = (10 x 82) + (6.25 x 178) - (5 x 30) + 5 = 820 + 1,112.5 - 150 + 5 = 1,788 calories
This is what his body burns doing absolutely nothing — lying in bed all day.
Step 2: Apply Your Activity Multiplier
Multiply BMR by your activity level:
| Activity Level | Multiplier | Description |
|---|---|---|
| Sedentary | 1.2 | Desk job, 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 + hard exercise |
Continuing our example (moderately active):
TDEE = 1,788 x 1.55 = 2,771 calories/day
Be honest about your activity level. Most people select one level higher than reality. If you exercise 3x/week but sit at a desk all day, you’re “Lightly Active” — not “Moderately Active.” When in doubt, pick the lower option.
TDEE by Body Type (Quick References)
Average Adult Male (5’9”, 175 lbs, age 30)
| Activity | TDEE |
|---|---|
| Sedentary | 2,100 |
| Lightly Active | 2,400 |
| Moderately Active | 2,700 |
| Very Active | 3,000 |
Average Adult Female (5’4”, 145 lbs, age 30)
| Activity | TDEE |
|---|---|
| Sedentary | 1,700 |
| Lightly Active | 1,950 |
| Moderately Active | 2,200 |
| Very Active | 2,450 |
Using TDEE for Weight Goals
Fat Loss (recommended: 500 cal deficit)
- TDEE - 500 = ~1 lb/week fat loss
- TDEE - 750 = ~1.5 lbs/week (aggressive but sustainable)
- Never go below BMR for extended periods
Muscle Gain (recommended: 250-500 cal surplus)
- TDEE + 250 = lean bulk (~0.5 lb/week, minimal fat gain)
- TDEE + 500 = standard bulk (~1 lb/week, some fat gain)
Maintenance
- Eat at TDEE (useful for diet breaks and stabilization phases)
Crash diets warning: Eating more than 1,000 calories below TDEE triggers metabolic adaptation — your body lowers BMR to conserve energy. This is why extreme diets lead to rebound weight gain. A moderate 500-calorie deficit preserves metabolism and muscle.
Why Your TDEE Changes
Your TDEE isn’t static. It shifts based on:
- Weight change: Losing 20 lbs can reduce TDEE by 150-200 cal/day
- Age: BMR drops ~2% per decade after 30
- Muscle mass: More muscle = higher BMR (about 6 cal/lb/day vs 2 cal/lb for fat)
- Dieting duration: Extended deficits reduce NEAT unconsciously (you fidget less, move less)
- Season: Slight increases in cold weather
Recalculate every 10-15 lbs of weight change or every 2-3 months during a diet.
Common TDEE Mistakes
- Using “Very Active” because you exercise daily — unless your job is also physical, you’re probably “Moderately Active”
- Not accounting for rest days — your weekly average matters more than any single day
- Eating back all exercise calories — fitness trackers overestimate by 30-50%
- Ignoring NEAT — taking 10,000 steps/day can burn 300-500 extra calories vs a sedentary day
- Setting it once and never adjusting — your TDEE changes as your body changes
The Practical Approach
- Calculate your TDEE with our calculator
- Track food intake for 2 weeks at calculated TDEE
- If weight stays stable: your TDEE is accurate
- If weight increases: reduce by 100-200 cal and retest
- If weight decreases: increase by 100-200 cal (or enjoy the deficit)
Your actual TDEE is what maintains your weight in practice — the formula gives you a starting estimate, but your body is the final judge.
The Bottom Line
- TDEE = total calories burned per day (BMR + activity + digestion)
- Most adults: 1,800 - 3,000 calories/day depending on size and activity
- Weight loss = eating below TDEE consistently
- Recalculate when your body or activity level changes significantly
- When in doubt about activity level, round down