TDEE Calculator: What Is Total Daily Energy Expenditure and How to Use It
Your Total Daily Energy Expenditure (TDEE) is the total number of calories your body burns in a day, including everything from breathing and digestion to exercise and walking. A TDEE calculator estimates this number based on your age, weight, height, gender, and activity level — giving you the single most important number for any diet plan.
What Is TDEE and Why Does It Matter?
TDEE stands for Total Daily Energy Expenditure. It represents the total calories your body uses in 24 hours. This number is the foundation of energy balance: if you eat more calories than your TDEE, you gain weight; if you eat fewer, you lose weight.
TDEE is composed of four main components: Basal Metabolic Rate (BMR) at 60-70%, Thermic Effect of Food (TEF) at about 10%, Non-Exercise Activity Thermogenesis (NEAT) at 15-20%, and Exercise Activity Thermogenesis (EAT) at 5-10%.
BMR vs. TDEE: What Is the Difference?
BMR is the calories your body burns at complete rest. TDEE is your BMR multiplied by an activity factor. A 30-year-old man who is 5'10" and weighs 180 lbs has a BMR of approximately 1,820 calories. If sedentary, his TDEE is roughly 2,185. If he exercises 3-5 times per week, his TDEE jumps to approximately 2,820 — a difference of 635 calories per day.
TDEE Formulas: Mifflin-St Jeor vs. Harris-Benedict
The Mifflin-St Jeor equation is more accurate for most people and is the formula used in most modern TDEE calculators:
- Men: (10 × weight kg) + (6.25 × height cm) − (5 × age) + 5
- Women: (10 × weight kg) + (6.25 × height cm) − (5 × age) − 161
TDEE by Body Type and Activity Level
| Profile | Weight | Sedentary | Moderate (3-5x/week) | Very Active (6-7x/week) |
|---|---|---|---|---|
| Woman, 25, 5'4" | 130 lbs | 1,580 | 2,040 | 2,380 |
| Woman, 35, 5'6" | 155 lbs | 1,700 | 2,200 | 2,560 |
| Man, 25, 5'9" | 165 lbs | 1,950 | 2,520 | 2,940 |
| Man, 35, 6'0" | 190 lbs | 2,100 | 2,720 | 3,170 |
Using TDEE for Weight Loss and Muscle Gain
- Weight loss — Eat 300-500 calories below your TDEE for 0.5-1 lb of fat loss per week. Use our calorie deficit calculator to find your target.
- Maintenance — Eat at your TDEE to maintain current weight.
- Muscle gain (bulking) — Eat 200-400 calories above your TDEE to support muscle growth.
Recalculate your TDEE whenever your weight changes by 10+ lbs. Losing 20 lbs reduces your TDEE by approximately 150-200 calories per day.
Frequently Asked Questions
How accurate is a TDEE calculator?
TDEE calculators provide an estimate typically within 10-15% of your actual expenditure. Use the calculator as a starting point, track for 2-3 weeks, and adjust based on actual weight changes.
What is the difference between TDEE and BMR?
BMR is calories burned at complete rest. TDEE includes BMR plus all activity. You should eat based on TDEE — eating at BMR level creates too large a deficit and can cause muscle loss.
Should I eat back calories burned during exercise?
If your TDEE already includes your exercise level, no — those calories are already accounted for. Only eat back exercise calories if you calculated TDEE at sedentary level. Be cautious with fitness tracker estimates, as they often overestimate by 20-40%.
Why is my TDEE different from my friend's even though we weigh the same?
TDEE depends on height, age, gender, body composition, activity level, and genetics. Someone with more muscle mass burns more calories at rest. Activity differences — including non-exercise movement — can account for several hundred calories per day.
How often should I recalculate my TDEE?
Recalculate every time your weight changes by 10+ lbs or your activity level changes significantly, and every 4-6 weeks during an active diet phase. Use our BMI calculator alongside your TDEE to track overall progress.