TDEE Calculator: Calculate Your Total Daily Energy Expenditure

Understanding how many calories your body burns each day is the foundation of any successful nutrition plan. Our TDEE calculatoruses the Mifflin-St Jeor equation to estimate your Basal Metabolic Rate (BMR) and then adjusts for your activity level to give you your Total Daily Energy Expenditure (TDEE) — the number of calories you need to maintain your current weight.

What Is TDEE?

Total Daily Energy Expenditure (TDEE) is the total number of calories your body burns in 24 hours. It includes everything from basic life-sustaining functions like breathing and circulation to exercise, daily movement, and even digesting food.

Your TDEE is composed of four main components:

• Basal Metabolic Rate (BMR) — 60-75% of TDEE. Calories burned at complete rest to keep your heart beating, lungs breathing, and cells functioning.
• Thermic Effect of Food (TEF) — ~10% of TDEE. Calories burned digesting and absorbing nutrients.
• Non-Exercise Activity Thermogenesis (NEAT) — 15-30% of TDEE. Calories burned through daily movement like walking, fidgeting, and standing.
• Exercise Activity Thermogenesis (EAT) — 5-10% of TDEE. Calories burned through intentional exercise.

The Mifflin-St Jeor Equation

The Mifflin-St Jeor equation is widely regarded as the most accurate formula for estimating BMR in the general population:

Once you have your BMR, multiply it by the appropriate activity factor to get your TDEE:

• Sedentary: BMR × 1.2 (little or no exercise)
• Lightly Active: BMR × 1.375 (1-3 days/week)
• Moderately Active: BMR × 1.55 (3-5 days/week)
• Very Active: BMR × 1.725 (6-7 days/week)
• Extra Active: BMR × 1.9 (intense daily or physical job)

How to Use TDEE for Weight Goals

Once you know your TDEE, adjusting your calorie intake becomes straightforward:

• Weight Maintenance: Eat at your TDEE. Your calorie intake matches your expenditure.
• Weight Loss: Eat 250-500 calories below your TDEE. A deficit of ~500 calories per day leads to about 1 lb (0.5 kg) of fat loss per week.
• Muscle Gain: Eat 250-500 calories above your TDEE. A moderate surplus supports muscle growth while minimizing fat gain.

Sample Calculation

Let us calculate the TDEE for a 30-year-old male who weighs 75 kg (165 lbs), is 175 cm (5'9") tall, and exercises 3-5 days per week:

Step 1 — Calculate BMR:
BMR = (10 × 75) + (6.25 × 175) − (5 × 30) + 5
BMR = 750 + 1093.75 − 150 + 5 = 1,699 kcal/day

Step 2 — Calculate TDEE:
TDEE = 1,699 × 1.55 (moderately active) = 2,633 kcal/day

Step 3 — Set Target:
For weight loss: 2,633 − 500 = 2,133 kcal/day
For muscle gain: 2,633 + 300 = 2,933 kcal/day

Important Factors That Affect TDEE

While the Mifflin-St Jeor equation provides an excellent starting point, several factors can influence your actual energy expenditure:

• Muscle mass: More muscle increases your BMR since muscle tissue burns more calories than fat at rest.
• Age: BMR naturally decreases with age due to hormonal changes and muscle loss.
• Genetics: Some people naturally have faster or slower metabolisms.
• Hormones: Thyroid function, stress hormones, and sex hormones all affect metabolic rate.
• Sleep: Poor sleep can reduce BMR and disrupt hunger-regulating hormones.

Use your TDEE as a starting point and adjust based on real-world results. If you are not losing weight on a 500-calorie deficit, you may need to reduce intake further or increase activity.

FAQ

Q: How often should I recalculate my TDEE?
A: Recalculate whenever your weight changes by 5-10 lbs (2-5 kg) or your activity level shifts. As you lose weight, your TDEE decreases because a lighter body requires fewer calories to maintain.

Q: Is the Mifflin-St Jeor equation accurate for everyone?
A: It is the most accurate general-purpose equation, with an error margin of about ±10%. Athletes with very high muscle mass or individuals with metabolic conditions may need adjustments.

Q: Can I use TDEE for both cutting and bulking?
A: Yes. For cutting (fat loss), create a deficit of 250-500 calories. For bulking (muscle gain), create a surplus of 250-500 calories. Track your progress over 2-3 weeks and adjust as needed.

Q: Should I eat back calories burned through exercise?
A: No — your activity level selection already accounts for your exercise. The TDEE calculation includes your typical activity. Only adjust if your routine changes significantly.

Q: Does the type of food I eat affect TDEE?
A: Slightly. Protein has a higher thermic effect (20-30% of its calories are burned during digestion) compared to carbs (5-10%) and fat (0-3%). A higher-protein diet can slightly increase your total daily energy expenditure.