Daily Calorie Needs & TDEE Calculator
Accurately determine how many calories you burn each day and find your optimal calorie target for weight loss, maintenance, or muscle building.
Personal Metrics
Target Calories by Fitness Goal
How is it calculated?
\text{TDEE} = \text{BMR} \times \text{Activity Factor}Computes your Basal Metabolic Rate using the Mifflin-St Jeor equation and scales it by your physical activity multiplier (1.2 to 1.9).
Worked Examples
Maintenance: 26yo Male, 70 kg, 175 cm, Moderate Exercise
BMR = 1,674 kcal. Moderate activity multiplier (1.55) yields a maintenance TDEE of 2,595 kcal/day.
Fat Loss (-500 kcal Deficit)
Targeting 2,095 kcal/day produces an energy deficit of 3,500 kcal per week, resulting in ~0.5 kg (1.1 lbs) of fat loss weekly.
The Comprehensive Guide to Daily Calorie Needs (TDEE) & Energy Balance
The First Law of Thermodynamics: Energy Balance Explained
Every physiological change in body weight is dictated by the principle of energy balance: the relationship between calories consumed through food and beverages versus calories expended through metabolic processes and physical motion.
When energy intake equals energy expenditure, your body remains in maintenance balance. Consuming fewer calories than you burn creates a negative energy balance (caloric deficit), forcing your body to metabolize stored adipose tissue. Consuming more creates a surplus, which supports muscle hypertrophy or fat storage.
The Four Pillars of Total Daily Energy Expenditure (TDEE)
Your TDEE is made up of four distinct metabolic components: 1) Basal Metabolic Rate (BMR, 60-70% of burn) keeping your vital organs functioning; 2) Non-Exercise Activity Thermogenesis (NEAT, 15-20%) from walking, fidgeting, and standing; 3) Thermic Effect of Food (TEF, 8-10%) energy required to digest proteins, fats, and carbs; and 4) Exercise Activity Thermogenesis (EAT, 5-10%) formal workouts.
Our calculator uses the clinical gold-standard Mifflin-St Jeor equation to compute your baseline BMR, then scales it using calibrated activity factors to generate your true daily maintenance target.
Calculating Safe and Sustainable Deficits for Weight Loss
A standard rule of thumb is that 1 pound of adipose tissue equates to approximately 3,500 kilocalories (~7,700 kcal per kilogram). Thus, a moderate deficit of 500 kcal per day leads to an average loss of roughly 0.5 kg (1.1 lbs) per week.
Aggressive deficits exceeding 1,000 kcal per day are rarely sustainable for long periods and can trigger adaptive thermogenesis, muscle catabolism, thyroid hormone down-regulation, and lethargy. Gradual deficits paired with adequate protein preserve your metabolic rate.
Frequently Asked Questions
What is the minimum safe daily calorie intake?
Why does weight loss slow down after a few weeks on a deficit?
Does the source of calories matter or just the total number?
Results are estimates and should not be considered financial advice.