TDEE Calculator
TDEE Calculator
Total Daily Energy Expenditure (TDEE) represents the total number of calories your body burns in a single day, accounting for all activities from sleeping to exercising. Understanding your TDEE is fundamental to managing body weight — whether your goal is to lose fat, build muscle, or simply maintain your current physique.
TDEE is composed of several components: Basal Metabolic Rate (BMR), which accounts for 60–75% of daily energy expenditure and represents the calories your body needs to maintain basic physiological functions at rest; the Thermic Effect of Food (TEF), which accounts for approximately 10% of energy expenditure related to digesting and processing food; and Physical Activity Energy Expenditure (PAEE), which varies widely based on lifestyle and exercise habits.
This calculator uses the Mifflin-St Jeor equation (considered the most accurate for most populations) and the Harris-Benedict equation (one of the oldest and most widely used) to estimate your BMR, then multiplies by an activity factor to determine your TDEE. The Mifflin-St Jeor equation was published in 1990 and has been validated across diverse populations, making it the preferred choice in clinical and research settings.
For more information, see the BMR Calculator.
Using the TDEE Calculator is straightforward and requires only a few inputs:
- Select Your Unit System: Choose between Metric (kg, cm) or US (lbs, ft/in) units. All calculations are performed in metric internally and converted for display.
- Enter Your Age: Input your age in years. BMR naturally declines with age due to decreases in lean body mass and metabolic rate, typically dropping by 1–2% per decade after age 20.
- Select Your Gender: Choose between Male or Female. Males generally have higher BMR than females due to greater average muscle mass and lower essential body fat percentage.
- Enter Your Body Weight: Input your weight in kilograms or pounds. Weight is one of the strongest predictors of BMR because larger bodies require more energy to maintain basic functions.
- Enter Your Height: Input your height in centimeters or feet and inches. Height correlates with lean body mass and body surface area, both of which influence metabolic rate.
- Select Your Activity Level: Choose from five activity levels ranging from sedentary (little to no exercise) to very active (intense exercise 6–7 days per week). This multiplier adjusts your BMR to reflect your daily energy expenditure.
- Review Your Results: The calculator will display your BMR, TDEE, and recommended caloric intake for maintenance, weight loss (typically a 500 kcal deficit for ~0.5 kg/week loss), and weight gain (typically a 500 kcal surplus for ~0.5 kg/week gain).
Example Calculation
A 30-year-old male, 180 cm tall (5'11"), weighing 80 kg (176 lbs) with a moderately active lifestyle:
- Mifflin-St Jeor BMR: approximately 1,790 kcal/day
- TDEE (moderately active, ×1.55): approximately 2,775 kcal/day
- Recommended for weight loss: approximately 2,275 kcal/day
- Recommended for muscle gain: approximately 3,275 kcal/day
A 28-year-old female, 165 cm tall (5'5"), weighing 65 kg (143 lbs) with a lightly active lifestyle:
- Mifflin-St Jeor BMR: approximately 1,390 kcal/day
- TDEE (lightly active, ×1.375): approximately 1,911 kcal/day
- Recommended for weight loss: approximately 1,411 kcal/day
- Recommended for muscle gain: approximately 2,411 kcal/day
Mifflin-St Jeor Equation (1990)
The Mifflin-St Jeor equation is currently considered the most accurate BMR estimation formula for the general population:
For a 30-year-old male weighing 80 kg and standing 180 cm tall:
Harris-Benedict Equation (Revised, 1990)
The revised Harris-Benedict equation was updated from the original 1919 version using more modern data:
For the same 30-year-old male:
Total Daily Energy Expenditure
TDEE is calculated by multiplying BMR by a physical activity factor:
The table below shows the five standard activity level multipliers:
| Activity Level | Multiplier | Description | Examples |
|---|---|---|---|
| Sedentary | 1.2 | Little to no exercise; desk job | Office worker, no regular exercise |
| Lightly Active | 1.375 | Light exercise 1–3 days per week | Walking, light cycling, yoga |
| Moderately Active | 1.55 | Moderate exercise 3–5 days per week | Jogging, swimming, strength training |
| Very Active | 1.725 | Hard exercise 6–7 days per week | Competitive sports, heavy training |
| Extra Active | 1.9 | Very hard exercise; physical labor | Athletes, manual laborers, soldiers |
Thermic Effect of Food (TEF)
The thermic effect of food represents approximately 10% of TDEE for a mixed diet, though this varies by macronutrient composition:
- Protein: 20–30% of calories consumed are used for digestion and metabolism
- Carbohydrates: 5–10% of calories consumed
- Fat: 0–3% of calories consumed
Estimated Caloric Needs for Different Goals
| Goal | Caloric Adjustment | Expected Rate of Change |
|---|---|---|
| Maintain Weight | TDEE ± 0 | Weight stable |
| Mild Fat Loss | TDEE − 300 to −500 kcal | ~0.3–0.5 kg/week (0.7–1 lb/week) |
| Standard Fat Loss | TDEE − 500 to −750 kcal | ~0.5–0.75 kg/week (1–1.5 lb/week) |
| Aggressive Fat Loss | TDEE − 750 to −1000 kcal | ~0.75–1 kg/week (1.5–2 lb/week) |
| Lean Muscle Gain | TDEE + 250 to +500 kcal | ~0.25–0.5 kg/week (muscle-focused) |
| Standard Muscle Gain | TDEE + 500 to +750 kcal | ~0.5–0.75 kg/week |
| Bulk / Aggressive Gain | TDEE + 750 to +1000 kcal | ~0.75–1 kg/week |
BMR Comparison: Mifflin-St Jeor vs. Harris-Benedict
| Example Person | Mifflin-St Jeor | Harris-Benedict | Difference |
|---|---|---|---|
| Male, 30 yrs, 80 kg, 180 cm | ~1,780 kcal/day | ~1,854 kcal/day | ~74 kcal |
| Female, 30 yrs, 65 kg, 165 cm | ~1,393 kcal/day | ~1,444 kcal/day | ~51 kcal |
| Male, 50 yrs, 90 kg, 175 cm | ~1,790 kcal/day | ~1,875 kcal/day | ~85 kcal |
| Female, 25 yrs, 55 kg, 160 cm | ~1,195 kcal/day | ~1,245 kcal/day | ~50 kcal |
- Estimation Only: All equations provide estimates. Individual metabolic rates can vary by 10–20% from predicted values due to genetic factors, hormonal differences, gut microbiome composition, and other individual variables not captured by simple formulas.
- Activity Level Subjectivity: The activity multiplier is inherently subjective. People often overestimate their activity level, leading to inflated TDEE estimates and difficulty losing weight as expected.
- Does Not Account for Body Composition: These formulas use total body weight without distinguishing between fat mass and lean mass. Two individuals with identical weight, height, age, and gender but different body fat percentages may have significantly different metabolic rates.
- Adaptive Thermogenesis: During prolonged calorie restriction, metabolic rate can decrease by 10–15% beyond what is predicted by weight loss alone, due to hormonal adaptations (leptin, thyroid hormones) and reduced non-exercise activity thermogenesis (NEAT).
- Medical Conditions Not Accounted For: Conditions such as hypothyroidism, hyperthyroidism, Cushing's syndrome, and other endocrine disorders can significantly alter metabolic rate without being reflected in these equations.
- Age-Related Changes: While age is included as a variable, the equations may not fully capture the metabolic changes associated with menopause, andropause, sarcopenia (muscle loss with aging), or significant hormonal shifts.
- Extreme Body Sizes: The equations are most accurate within 1–2 standard deviations of average body size. Individuals who are significantly underweight, obese, or have extremely muscular builds may experience reduced accuracy.
- Does Not Replace Professional Guidance: Caloric recommendations are general guidelines. Individual nutritional needs should be assessed by a registered dietitian or healthcare provider, especially for athletes, individuals with eating disorders, or those with chronic health conditions.
- Be Honest About Activity Level: Most people overestimate their activity. Track your actual exercise days and intensity for a week before selecting your activity level.
- Recalculate Periodically: Your TDEE changes as you age, gain or lose weight, and change your activity habits. Recalculate every 3–6 months for the most accurate estimates.
- Use a Food Scale: Tracking food intake by weight rather than volume provides significantly more accurate calorie counting.
- Monitor Weekly Averages: Daily weight fluctuates due to water, sodium, and food volume. Track weekly averages to assess whether your caloric intake is producing the expected rate of weight change.
- Adjust Gradually: If you are trying to lose or gain weight, make adjustments of 100–200 calories at a time rather than large changes, which can be counterproductive and difficult to sustain.
- Prioritize Protein: Regardless of your goal, maintaining adequate protein intake (1.6–2.2 g per kg of body weight) helps preserve muscle mass during fat loss and supports muscle growth during surplus.
- Consider a TDEE Range: Rather than a single number, consider your TDEE as a range of ±100–150 calories. This accounts for daily variations in activity, stress, sleep quality, and other factors.
- How accurate is this calculator?
- The Mifflin-St Jeor equation has been shown to be accurate within 10% of measured metabolic rate in about 70–80% of the population. The Harris-Benedict equation tends to overestimate BMR by about 5% for most people but may be more accurate for very muscular individuals.
- Should I eat exactly my TDEE to maintain weight?
- Not necessarily. Due to daily variations in activity, stress, hormonal fluctuations, and food thermogenesis, your actual daily calorie needs can vary by 100–300 calories. Tracking weight trends over weeks is more reliable than matching daily intake to a calculated number.
- Why am I not losing weight at my calculated deficit?
- Several factors can prevent expected weight loss: underestimating food intake, overestimating activity, metabolic adaptation, water retention from sodium or hormonal changes, medical conditions, or medication effects. Consider tracking food more carefully and consulting a healthcare provider if consistent deficits do not produce results.
- Is TDEE the same as calories burned?
- TDEE approximates total daily energy expenditure but is not identical to measured calorie burn. Exercise trackers and heart rate monitors often overestimate calories burned during exercise. TDEE provides a more reliable estimate for dietary planning purposes.
- Do I need to recalculate if I lose significant weight?
- Yes. As you lose weight, your BMR decreases because smaller bodies require less energy. Recalculate your TDEE every 5–10 lbs (2–5 kg) of weight change to adjust your caloric targets appropriately.
- Can I build muscle without a caloric surplus?
- Yes, but typically only under certain conditions. Beginners, individuals returning to training after a break, and those with higher body fat can sometimes build muscle in a small caloric deficit (body recomposition). However, most intermediate and advanced lifters require a surplus for optimal muscle growth.
- Mifflin, M.D., et al. (1990). A New Predictive Equation for Resting Energy Expenditure in Healthy Individuals. The American Journal of Clinical Nutrition, 51(2), 241–247.
- Roza, A.M., & Shizgal, H.M. (1984). The Harris-Benedict Equation Reevaluated: Resting Energy Requirements and the Body Cell Mass. The American Journal of Clinical Nutrition, 40(1), 168–182.
- Frankenfield, D., et al. (2005). Comparison of Predictive Equations for Resting Metabolic Rate in Healthy Nonobese and Obese Adults: A Systematic Review. Journal of the American Dietetic Association, 105(9), 1365–1371.
- Heymsfield, S.B., et al. (2006). Energy Balance Measurement: When Something Is Not Zero. American Journal of Clinical Nutrition, 83(4), 971–978.
- World Health Organization. (2004). Energy and Protein Requirements: Report of a Joint FAO/WHO/UNU Expert Consultation. WHO Technical Report Series 935.
- Thomas, D.M., et al. (2016). Can a Weight Loss of One Pound a Week Be Achieved with a 3500-kcal Deficit? International Journal of Obesity, 40(3), 477–481.
Last updated: May 24, 2026