Overview & Purpose
Total Daily Energy Expenditure (TDEE) represents the total number of calories your body burns over a 24-hour period through basic biological metabolic functions, digestive processes, and physical activity. Understanding your exact TDEE is the cornerstone of evidence-based nutrition planning. Whether your objective is to shed excess body fat, build lean muscle tissue, maintain your current physical body composition, or optimize athletic performance, your daily caloric intake must be calibrated directly against your TDEE. This TDEE calculator utilizes the clinically validated Mifflin-St Jeor equation to compute your Basal Metabolic Rate (BMR) and applies activity multipliers to calculate your precise daily maintenance calories. By establishing an accurate energy baseline, you can design effective weight management plans with complete mathematical confidence and reach your health goals safely.
How TDEE Calculator Works
TDEE calculation is based on energy balance principles, combining resting metabolic energy requirements with active physical energy expenditure.
1. Basal Metabolic Rate (BMR): BMR measures the calories your body consumes at complete rest to sustain vital organ functions, such as breathing, blood circulation, cellular repair, and brain activity. This calculator uses the Mifflin-St Jeor formula, widely recognized by medical professionals as the most accurate standard for non-obese and obese adults: • Men: BMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age in years) + 5 • Women: BMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age in years) - 161
2. Physical Activity Multiplier (PAL): Because daily movement requires additional energy, your BMR is multiplied by an activity factor matching your routine: • Sedentary (1.2): Desk job with minimal intentional exercise. • Lightly Active (1.375): Light workouts 1 to 3 days per week. • Moderately Active (1.55): Moderate training 3 to 5 days per week. • Very Active (1.725): Intense workouts 6 to 7 days per week. • Extra Active (1.9): Professional athletic training or strenuous manual labor.
3. Thermic Effect of Food (TEF) & NEAT: TDEE accounts for Non-Exercise Activity Thermogenesis (NEAT, such as walking and fidgeting) and TEF (calories burned digesting food, which averages 10% of total intake). Consuming calories equal to your TDEE maintains body weight; consuming below TDEE creates a calorie deficit for fat loss, while consuming above TDEE creates a surplus for muscle growth. Re-evaluating your TDEE every 4 to 6 weeks ensures your nutrition plan adapts as your body weight and activity levels evolve.
Formula & Calculation Method
Basal Metabolic Rate is calculated using the validated Mifflin-St Jeor equation. TDEE multiplies BMR by a physical activity factor ranging from 1.2 (sedentary) to 1.9 (extra active).
Worked Calculation Examples
30-year-old male, 5'10" (178 cm), 170 lbs (77 kg), Moderately Active
Computes a BMR of 1,720 kcal. Applying the 1.55 activity multiplier yields a TDEE of 2,666 maintenance calories per day.
28-year-old female, 5'5" (165 cm), 135 lbs (61 kg), Lightly Active
Computes a BMR of 1,355 kcal. Applying the 1.375 activity factor yields a TDEE of 1,863 maintenance calories per day.
40-year-old male, 6'0" (183 cm), 200 lbs (91 kg), Sedentary office worker
Computes a BMR of 1,845 kcal. Applying the 1.2 sedentary multiplier yields a TDEE of 2,214 maintenance calories per day.
Common Mistakes to Avoid
- Overestimating daily physical activity level (e.g. selecting "Very Active" for 45 minutes of moderate weightlifting).
- Failing to recalculate TDEE after significant body weight loss, leading to weight loss plateaus.
Note: TDEE estimations provide educational baselines based on standard metabolic equations. Individual daily energy expenditure may vary based on genetics, metabolic health, and muscle mass.