What Is TDEE? (Total Daily Energy Expenditure Explained)

TDEE stands for Total Daily Energy Expenditure. It's the total number of calories your body burns in a day — from basic biological functions like breathing and circulation, to physical activity, digestion, and everything in between.

Your TDEE is essentially your maintenance calorie level: eat at your TDEE and your weight stays the same. Eat less and you lose weight. Eat more and you gain.

TDEE vs BMR: What's the Difference?

You might also have heard of BMR (Basal Metabolic Rate). These two are related but different:

• BMR is the number of calories your body needs at complete rest — just to keep your organs functioning. For most people, this is 60–75% of their total calorie burn.
• TDEE is BMR multiplied by an activity multiplier. It accounts for how active you actually are throughout the day.

So if your BMR is 1,600 calories and you're moderately active, your TDEE might be around 2,200–2,400 calories.

How Is TDEE Calculated?

TDEE is calculated in two steps. First, BMR is estimated from your height, weight, age and sex. The most accurate formula for most people is the Mifflin-St Jeor equation:

• 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

BMR is then multiplied by an activity factor:

• Sedentary (desk job, little exercise): × 1.2
• Lightly active (1–3 days exercise/week): × 1.375
• Moderately active (3–5 days): × 1.55
• Very active (6–7 days hard exercise): × 1.725
• Extra active (physical job + daily training): × 1.9

How to Use Your TDEE

Once you know your TDEE, you can set a calorie target based on your goal:

• Weight loss: Eat 300–500 calories below TDEE. This creates a deficit of roughly 0.3–0.5kg of fat loss per week. Larger deficits are possible but risk muscle loss and are harder to sustain.
• Muscle gain: Eat 200–300 calories above TDEE. A modest surplus with consistent resistance training is the most effective approach for muscle growth without excessive fat gain.
• Maintenance: Eat at TDEE. Useful if you're at a healthy weight and want to maintain it while building performance.

Why TDEE Changes Over Time

Your TDEE isn't fixed. It changes when:

• Your weight changes (lighter bodies burn fewer calories at rest)
• Your activity level changes
• Your body adapts to a long-term calorie deficit (metabolic adaptation)
• You gain significant muscle mass (muscle tissue burns more calories than fat)

This is why recalculating your TDEE every 4–6 weeks, or whenever your weight changes by more than 3–4kg, is worthwhile.