Calculate your daily calorie needs based on activity level
years
Enter your age in years
Select your biological gender
cm
Enter your height in centimeters
kg
Enter your current weight in kilograms
Choose your typical daily activity level
Basal Metabolic Rate (BMR)—
Total Daily Energy Expenditure (TDEE)—
For Weight Loss (500 kcal deficit)—
For Weight Gain (500 kcal surplus)—
What does this mean? Your BMR represents the calories your body burns at rest. Your TDEE is the total daily calories you burn including activity. The weight loss and gain targets show recommended daily calorie intake for a 0.5 kg change per week.
Understanding Your TDEE
Total Daily Energy Expenditure (TDEE) is the total number of calories your body burns in a day, including all physical activities and bodily functions. Knowing your TDEE is essential for managing your weight effectively, whether you want to lose, gain, or maintain your current weight. This calculator uses the Mifflin-St Jeor equation, which is one of the most accurate methods for estimating BMR and TDEE.
What is BMR?
Basal Metabolic Rate (BMR) is the number of calories your body needs to perform basic functions at rest, such as breathing, circulation, cell production, and nutrient processing. Your BMR accounts for 60-75% of your total daily calorie expenditure in sedentary individuals. Factors that influence BMR include age, gender, height, weight, and muscle mass. Generally, men have higher BMR than women, and muscle tissue burns more calories than fat tissue.
How Activity Level Affects TDEE
Your activity level significantly impacts how many calories you burn daily. The calculator typically uses the following classifications: sedentary (little or no exercise), lightly active (1-3 days per week), moderately active (3-5 days per week), very active (6-7 days per week), and extremely active (physical job or training twice per day). Choosing the correct activity level is crucial for an accurate TDEE calculation. Overestimating activity can lead to consuming too many calories, while underestimating may result in consuming too few.
Using TDEE for Weight Loss
To lose weight, you need to consume fewer calories than your TDEE. A deficit of 500 kcal per day typically results in losing approximately 0.5 kg (1 pound) per week, which is considered a safe and sustainable rate. This calculator automatically shows your target calorie intake for weight loss. However, never drop below 1,200-1,500 kcal per day without medical supervision, as this can lead to nutrient deficiencies and metabolic issues.
Using TDEE for Weight Gain
To gain weight, you need to consume more calories than your TDEE. Adding 500 kcal per day above your TDEE can result in gaining approximately 0.5 kg per week. This is particularly useful for individuals looking to build muscle mass when combined with resistance training. Focusing on nutrient-dense foods and adequate protein intake (1.6-2.2 grams per kilogram of body weight) will help maximize muscle gain over fat gain.
Factors That Influence TDEE
Beyond the basic inputs, several factors can influence your actual TDEE. Metabolism naturally slows with age, losing approximately 2-5% per decade after age 30. Genetics play a role in how efficiently your body processes calories. Hormonal factors, stress levels, sleep quality, and diet composition all affect your metabolic rate. Additionally, building muscle mass through strength training increases your BMR, as muscle tissue is metabolically active and burns more calories at rest than fat tissue.
Why is my calculated TDEE different from other calculators?
Different calculators may use different formulas (Mifflin-St Jeor, Harris-Benedict, Katch-McArdle) and activity multipliers. The Mifflin-St Jeor equation used here is generally considered the most accurate for most people. Individual variation can also be significant, so use the result as a starting point and adjust based on real-world results.
How often should I recalculate my TDEE?
Recalculate your TDEE whenever your weight changes significantly (5+ kg) or if your activity level changes substantially. It's also wise to recalculate every 3-6 months during a weight loss or gain journey, as your needs change as your body composition changes.
Can I eat the same amount every day or should I vary my intake?
You can eat approximately the same amount daily, but many people find success with flexible dieting that allows for variation day-to-day. What matters most is averaging the correct calorie intake over a week. This flexibility can make long-term adherence easier.
What if I'm not seeing results after following the calculated calories?
If results stall, first ensure you're accurately tracking calories (use a food scale and app). If tracking is accurate, you may need to adjust by 100-200 calories. Remember that water retention, hormonal fluctuations, and changes in digestion can temporarily mask progress.
Should I eat back calories burned during exercise?
This depends on your activity level selection. If you selected an activity level that already accounts for exercise, don't eat them back. If your activity is variable, you might eat back 50-75% of exercise calories as calorie burn estimates are often inflated, and your body is already partly accounted for in BMR.