What Is TDEE and How to Use It for Weight Loss

TDEE — Total Daily Energy Expenditure — is the total number of calories your body burns in a 24-hour period. It combines your Basal Metabolic Rate (BMR) with the energy you spend moving, exercising, and even digesting food. Knowing your TDEE is the single most useful number for weight management because it tells you exactly how many calories to eat to maintain, lose, or gain weight.

TDEE vs. BMR: What's the Difference?

Your BMR is the number of calories your body needs just to stay alive — breathing, circulating blood, maintaining organ function — if you were to lie motionless all day. TDEE builds on BMR by adding every other calorie-burning activity:

• NEAT (Non-Exercise Activity Thermogenesis): Walking to the fridge, fidgeting, household chores
• EAT (Exercise Activity Thermogenesis): Intentional workouts
• TEF (Thermic Effect of Food): Energy spent digesting meals (~10% of intake)

Most people's TDEE is 1.3× to 2× their BMR, depending on how active they are.

How to Calculate Your TDEE

The most widely validated approach uses the Mifflin-St Jeor equation for BMR, then multiplies by an activity factor:

• Men: BMR = 10 × weight(kg) + 6.25 × height(cm) − 5 × age − 5
• Women: BMR = 10 × weight(kg) + 6.25 × height(cm) − 5 × age − 161

Then multiply BMR by your activity level: 1.2 (sedentary), 1.375 (light exercise), 1.55 (moderate), 1.725 (very active), or 1.9 (athlete). Our TDEE Calculator does all of this for you instantly.

Using TDEE for Weight Loss

To lose weight, you need a calorie deficit — eating less than your TDEE. A deficit of 500 calories per day results in approximately 1 pound of weight loss per week (3,500 calories ≈ 1 pound of fat). Here's a practical framework:

• Mild deficit (250 cal/day): ~0.5 lb/week — sustainable, minimal muscle loss
• Moderate deficit (500 cal/day): ~1 lb/week — the gold standard recommendation
• Aggressive deficit (750+ cal/day): faster results but higher risk of muscle loss and diet fatigue

Never drop below 1,200 calories (women) or 1,500 calories (men) without medical supervision.

Common TDEE Mistakes

• Overestimating activity level: Most desk workers are "sedentary" even if they hit the gym 3×/week. Be honest.
• Forgetting weekends: Two days of overeating can erase five days of deficit.
• Not recalculating: As you lose weight, your TDEE drops. Recalculate every 10–15 lbs lost.
• Ignoring protein: High protein (0.7–1g per pound bodyweight) preserves muscle during a deficit.

Track, Adjust, Repeat

TDEE calculators give an estimate — your real TDEE might be 10–15% higher or lower. Track your food intake and weight for 2–3 weeks, then adjust. If you're not losing weight at your calculated deficit, reduce by another 100–200 calories. Use our Calorie Calculator to dial in your daily target and our Macro Calculator to split those calories into protein, carbs, and fat.