How to Calculate TDEE – Total Daily Energy Expenditure

Your Total Daily Energy Expenditure (TDEE) is the total number of calories your body burns in a 24-hour period, taking into account everything from breathing and digestion to walking, working out, and even fidgeting. Knowing your TDEE is the foundation of any evidence-based nutrition plan, whether your goal is fat loss, muscle gain, or simply maintaining your current weight.

What is the difference between BMR and TDEE?

Your Basal Metabolic Rate (BMR) is the number of calories your body needs to maintain basic life functions at complete rest — heartbeat, breathing, temperature regulation, and organ function. BMR accounts for roughly 60–70% of your total calorie burn. TDEE is higher than BMR because it adds the calories burned through all daily movement and physical activity.

TDEE = BMR × Activity Multiplier

Step 1 – Calculate your BMR

The Mifflin-St Jeor equation is the most widely validated BMR formula for most adults:

• 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

Example: A 30-year-old woman, 65 kg, 165 cm tall: BMR = (10 × 65) + (6.25 × 165) – (5 × 30) – 161 = 650 + 1031.25 – 150 – 161 = 1,370 calories/day

Step 2 – Multiply by your activity level

Choose the activity multiplier that best matches your typical week:

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

Using our example above: lightly active woman → TDEE = 1,370 × 1.375 = 1,884 calories/day

This is her maintenance calorie intake — eating this amount keeps her weight stable.

Using TDEE to set your calorie target

Once you know your TDEE, adjusting for your goal is straightforward:

• Weight loss: Eat 300–500 calories below TDEE per day (gradual, sustainable fat loss of 0.3–0.5 kg/week)
• Aggressive weight loss: Eat 500–750 below TDEE (not recommended for more than 12 weeks without medical guidance)
• Maintenance: Eat at TDEE
• Muscle gain (lean bulk): Eat 200–300 above TDEE

For the example above: weight loss target = 1,884 – 400 = 1,484 calories/day

Why people underestimate their activity level

The most common TDEE error is overestimating activity level. Most people who go to the gym 3 times a week but sit at a desk for 8 hours are lightly active, not moderately active. Overestimating your activity multiplier by one level creates a 200–400 calorie discrepancy that explains why many people "eat at a deficit" but don't lose weight.

How TDEE changes as you lose weight

As your body weight decreases, your BMR decreases — a lighter body burns fewer calories at rest. Additionally, metabolic adaptation means the body becomes more efficient at conserving energy during prolonged calorie restriction. This is why fat loss slows down over time even when eating the same amount. Recalculating your TDEE every 4–6 weeks during a diet accounts for this natural adjustment.

TDEE and macronutrient distribution

Once you know your TDEE and calorie target, dividing those calories into macronutrients (protein, carbohydrates, fat) completes your nutrition plan. A general starting point for fat loss:

• Protein: 1.6–2.2 g per kg of body weight (highest priority for muscle retention)
• Fat: 0.8–1 g per kg of body weight (hormone health minimum)
• Carbohydrates: Remaining calories after protein and fat are set

Frequently asked questions about TDEE

What is TDEE? TDEE is Total Daily Energy Expenditure — the total calories your body burns in a day, including BMR and all physical activity.

How many calories below TDEE should I eat to lose weight? A deficit of 300–500 calories per day is considered sustainable for gradual fat loss of approximately 0.3–0.5 kg per week.

Does TDEE change over time? Yes. As you lose weight, your TDEE decreases because your lighter body burns fewer calories. Recalculate every 4–6 weeks during a diet.

Should I eat back exercise calories? If you used the sedentary multiplier and want to add exercise calories on top, you can eat back roughly 50–75% of estimated burn. If you used a higher activity multiplier, those calories are already accounted for.

Practical checklist for using TDEE

• Calculate BMR using current weight, not goal weight
• Choose your activity multiplier honestly — most desk workers are sedentary to lightly active
• Recalculate TDEE every 4–6 weeks as weight changes
• Track calories for at least 2 weeks before adjusting — daily fluctuations are normal
• Combine TDEE with adequate protein intake to preserve muscle during fat loss

Final takeaway

TDEE is the single most important number for anyone trying to manage their body weight intentionally. It removes the guesswork from "how much should I eat?" and replaces it with a personalised, evidence-based starting point. Use the calculators below to find your BMR, TDEE, and calorie targets in seconds.