What Is TDEE and How Do You Use It to Lose Weight?

TDEE — Total Daily Energy Expenditure — is the total number of calories your body burns in a 24-hour period, including everything: rest, digestion, movement and exercise. It is the number that actually matters when you are trying to lose, gain or maintain weight.

How TDEE Is Calculated

TDEE is calculated by multiplying your BMR (Basal Metabolic Rate) by an activity multiplier that reflects how active you are:

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

Using the earlier example — a 30-year-old woman with a BMR of 1,352 calories who has a desk job and exercises lightly: TDEE = 1,352 × 1.375 = 1,859 calories per day.

Using TDEE to Create a Calorie Deficit

To lose weight, you need to eat fewer calories than your TDEE. A deficit of 300–500 calories per day is sustainable and leads to approximately 0.3–0.5 kg of fat loss per week. In the example above, the woman would target 1,359–1,559 calories per day.

Larger deficits (above 700–1,000 calories) accelerate weight loss in the short term but are associated with greater muscle loss, nutritional deficiencies, hunger and eventually metabolic adaptation that slows further loss.

Why Most People Get This Wrong

• Using a calorie target that is too low (below BMR) — leads to metabolic adaptation and muscle loss
• Overestimating activity level — choosing "very active" when the reality is a desk job with occasional gym visits
• Not accounting for how activity changes over time — TDEE changes as weight changes
• Treating TDEE as a precise number rather than an estimate — actual TDEE can vary by 10–15%
• Forgetting that TDEE decreases as you lose weight — the target needs to be recalculated every few weeks

How Often Should You Recalculate?

Recalculate your BMR and TDEE every 4–6 weeks as you lose weight, since your TDEE decreases with your body weight. What worked as a calorie deficit at 80 kg may be maintenance or even a surplus at 72 kg.

TDEE and Indian Meal Planning

Once you know your calorie target, distributing it across 3 meals and 1–2 snacks is practical for most people. For a 1,500 calorie target, a common distribution would be: breakfast 350–400 kcal, lunch 500 kcal, evening snack 100–150 kcal, dinner 450 kcal. Your dietitian will adjust this to your hunger patterns and schedule.