What is TDEE and How to Use It for Weight Loss

Your Total Daily Energy Expenditure (TDEE) is the total number of calories your body burns in a single day, accounting for all activities from breathing to intense exercise. Understanding your TDEE is the foundation of any effective weight loss plan because it tells you exactly how many calories you need to maintain your current weight — and therefore how much you need to reduce to lose weight.

How TDEE Is Calculated

TDEE is calculated by first determining your Basal Metabolic Rate (BMR) — the calories your body burns at complete rest — and then multiplying it by an activity factor. The most widely used formula 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

Your BMR is then multiplied by an activity multiplier: - Sedentary (little or no exercise): BMR × 1.2 - Lightly active (1–3 days/week): BMR × 1.375 - Moderately active (3–5 days/week): BMR × 1.55 - Very active (6–7 days/week): BMR × 1.725 - Extra active (physical job + exercise): BMR × 1.9

Using TDEE for Weight Loss

To lose weight, you need to eat fewer calories than your TDEE. A deficit of 500 calories per day results in approximately 1 pound of weight loss per week. Here are some practical guidelines:

1. Calculate your TDEE using our TDEE Calculator
2. Subtract 500 calories for steady weight loss (or 250 for slower, more sustainable loss)
3. Track your intake for at least the first few weeks to build awareness
4. Recalculate every 10-15 pounds lost, as your TDEE decreases with weight loss

Common TDEE Mistakes

The biggest mistake people make is overestimating their activity level. If you work a desk job and exercise 3 times per week, you're likely "lightly active," not "moderately active." Being honest about your activity level is crucial for accurate results.

Another common error is creating too large a deficit. Eating below your BMR can slow your metabolism, cause muscle loss, and lead to nutrient deficiencies. Most experts recommend never going below a 25% calorie deficit from your TDEE.

The Bottom Line

TDEE is the most practical tool for weight management because it accounts for your entire daily energy expenditure, not just your resting metabolism. Use our Calorie Deficit Calculator to find your ideal deficit, and our Macro Calculator to optimize what you eat within your calorie target.