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TDEE stands for Total Daily Energy Expenditure — the total number of calories your body burns each day. It combines your Basal Metabolic Rate (BMR, the calories burned at rest) with additional calories burned through physical activity. Knowing your TDEE tells you exactly how many calories to eat to maintain, lose, or gain weight.
TDEE is calculated by first estimating your Basal Metabolic Rate (BMR) using the Mifflin-St Jeor formula — which uses your age, sex, height, and weight — then multiplying the result by an activity factor (1.2 for sedentary, up to 1.9 for very active). This calculator does all of that automatically based on the details you enter.
No. BMR (Basal Metabolic Rate) is the number of calories your body burns at complete rest — just to keep organs functioning. TDEE is always higher than BMR because it adds the calories burned through daily movement and exercise. Most people's TDEE is 20–60% higher than their BMR depending on how active they are.
TDEE calculators using the Mifflin-St Jeor formula are accurate to within 10% for most adults. The main source of error is the activity multiplier — people tend to overestimate how active they are. Start with the result, track your weight for 2–3 weeks, and adjust your calorie target if your weight isn't moving as expected.