TDEE Calculator

TL;DR: To calculate your Total Daily Energy Expenditure (TDEE), use the Mifflin-St Jeor equation to find your Basal Metabolic Rate (BMR)—which for men is (10 × weight in kg) + (6.25 × height in cm) − (5 × age in years) + 5, and for women is (10 × weight in kg) + (6.25 × height in cm) − (5 × age in years) − 161—then multiply that result by an activity factor (1.2 for sedentary, 1.375 for light, 1.55 for moderate, 1.725 for very active, or 1.9 for athlete) to get your maintenance calories.

What Is the TDEE Calculator?

The TDEE Calculator is a tool that estimates the total number of calories your body burns every day through a combination of your resting metabolism, daily movements, and structured exercise. This number, called Total Daily Energy Expenditure, represents the exact caloric intake required to maintain your current body weight under your typical lifestyle conditions. Unlike a simple calorie counter that logs food intake, this calculator focuses purely on energy output, providing the baseline number you need for any weight management goal.

This calculator is essential for anyone who wants to lose fat, gain muscle, or maintain their body weight with precision. Without knowing your TDEE, you are essentially guessing at your calorie targets, which leads to frustrating plateaus or unwanted weight changes. Athletes, bodybuilders, dieters, and everyday individuals use this calculation to set realistic daily calorie budgets. More importantly, the tool removes the guesswork by using a scientifically validated formula that has been tested against indirect calorimetry—the gold standard for measuring energy expenditure—making it far more reliable than generic 2,000-calorie recommendations.

How to Use the Calculator

Follow this simple step-by-step process to get your accurate TDEE result:

1. Enter your weight: Input your current body weight in kilograms (kg). If your scale measures in pounds, divide your weight by 2.2046 to convert before entering it into the calculator.
2. Enter your height: Input your height in centimeters (cm). For those using feet and inches, multiply your total inches by 2.54 to get your centimetre value.
3. Enter your age: Provide your current age in years. This is critical because metabolic rate naturally declines approximately 1-2% per decade after age 20 due to muscle loss and hormonal changes.
4. Select your sex: Choose "male" or "female." The calculation uses different constants for each due to inherent differences in body composition and hormonal influences on metabolism.
5. Select your activity level: Choose from the following list that best represents your typical weekly activity:
   • Sedentary: Little or no exercise, desk job (multiply by 1.2)
   • Lightly active: Light exercise/sports 1-3 days per week (multiply by 1.375)
   • Moderately active: Moderate exercise/sports 3-5 days per week (multiply by 1.55)
   • Very active: Hard exercise/sports 6-7 days per week (multiply by 1.725)
   • Athlete: Very hard exercise/physical job or training twice per day (multiply by 1.9)
6. Calculate: Press the calculate button. The calculator will first compute your BMR using the Mifflin-St Jeor formula, then multiply it by your selected activity factor to produce your TDEE.

Formula and Calculation Method

The TDEE Calculator uses a two-step process. First, it calculates your Basal Metabolic Rate (BMR) using the Mifflin-St Jeor equation, which is widely considered the most accurate predictive formula for resting energy expenditure in non-obese and obese individuals alike. This formula was developed in 1990 and has since replaced the older Harris-Benedict equation due to its superior accuracy, being within 5% of measured values in approximately 80% of the population.

The Mifflin-St Jeor formula is:

• For men: BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age in years) + 5
• For women: BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age in years) − 161

After calculating BMR, the result is multiplied by the activity factor corresponding to your chosen level of physical activity. The activity factors (1.2, 1.375, 1.55, 1.725, 1.9) represent the thermic effect of food (approximately 10% of daily energy) combined with your physical activity level. These multipliers were established by the World Health Organization and have been validated in numerous metabolic studies.

Worked example: Let’s calculate the TDEE for a 30-year-old male who weighs 75 kg, is 175 cm tall, and exercises moderately 3-5 days per week.

Step 1: Calculate BMR.
BMR = (10 × 75) + (6.25 × 175) − (5 × 30) + 5
BMR = 750 + 1093.75 − 150 + 5
BMR = 1698.75 calories per day

Step 2: Multiply by the activity factor for moderate exercise (1.55).
TDEE = 1698.75 × 1.55
TDEE = 2633.06 calories per day

This individual needs approximately 2,633 calories per day to maintain his current weight. If he increases his exercise frequency to 6-7 days per week, his TDEE would rise to 2,930 calories (1698.75 × 1.725). Conversely, if he becomes sedentary, his maintenance needs drop to 2,039 calories.

Practical Examples

Here are three realistic scenarios demonstrating different inputs and the resulting caloric recommendations:

Tips for Accurate Results

Getting the most out of your TDEE calculation requires attention to detail. First and foremost, do not overestimate your activity level—this is the most common mistake. Many people who sit at a desk for 8 hours and walk 15 minutes to the train station still select "moderately active" because they go to the gym twice a week. In reality, most individuals are sedentary or lightly active. Honest self-assessment is critical. If you have a desk job and exercise 1-3 hours per week, you are lightly active, not moderate. The activity multipliers have a massive impact: choosing 1.55 instead of 1.375 can overestimate your daily needs by 250-300 calories, which leads to unintended weight gain over several months.

Another crucial tip is to re-calculate your TDEE every 5 kilograms of weight change. When you lose weight, your BMR decreases because a smaller body requires less energy to maintain. If you do not adjust your calorie target downward, you will hit a plateau. Similarly, if you gain lean muscle, your BMR increases slightly, but this effect is usually less than 5% and may not require recalculating unless you gain more than 2-3 kg of muscle mass.

Finally, remember that the TDEE is just a starting estimate. Your actual metabolic rate can vary by ±200 calories per day due to genetics, thyroid function, sleep quality, and daily physical movement variations. Track your weight for 2 weeks while eating the calculated amount. If the scale does not move, adjust your intake down by 100 calories and re-evaluate after another week. Similarly, do not blindly follow the TDEE without listening to your body's hunger and satiety signals; hormonal and psychological cues are powerful regulators that should complement, not be overridden by, numerical targets.

Frequently Asked Questions

What is the difference between BMR and TDEE?

Basal Metabolic Rate (BMR) is the number of calories your body burns at complete rest to maintain essential functions like breathing, blood circulation, cell production, and brain activity. It typically accounts for 60-70% of your total daily energy expenditure. TDEE, on the other hand, is the total calories burned in a full 24-hour period, including all activity beyond rest: walking, typing, digesting food, exercising, and even fidgeting. In practical terms, BMR is the number you would need if you were in a coma, while TDEE is what you actually need daily. For a 75 kg male, his BMR might be 1,698 calories, but his TDEE with moderate exercise jumps to 2,633 calories. When you see diet plans recommending specific calorie cuts, they are almost always referencing the deficit from TDEE, not BMR.

How accurate is the Mifflin-St Jeor formula compared to lab testing?

The Mifflin-St Jeor formula is considered the most reliable predictive equation, with an accuracy rate of approximately 80% within 5% of measured BMR when compared against direct calorimetry. This means for a person with a true BMR of 1,700 calories, the formula will likely predict between 1,615 and 1,785 calories. However, accuracy varies by population: it tends to overestimate BMR in very muscular individuals by up to 10%, and it can underestimate BMR in older populations (over 70) by about 5%. For those with significant obesity (BMI above 40), the formula may overestimate true BMR by 7-10%, which is why some practitioners use the Cunningham equation for athletes. Despite these limitations, the formula is far superior to age-based or weight-only calculators, and the error margin is acceptable for practical diet planning.

Should I eat fewer calories than my TDEE to lose weight?

Yes, to lose weight you must consume fewer calories than your TDEE, creating a caloric deficit. A safe and sustainable rate of weight loss is 0.5 to 1 kg per week, which corresponds to a daily deficit of 500 to 1,000 calories below your TDEE. For example, if your TDEE is 2,633 calories, eating approximately 2,133 calories per day should result in losing roughly 0.5 kg per week. However, you should never let your intake drop below your BMR (around 1,698 calories in our example) for extended periods, as this can slow your metabolism, cause muscle loss, and trigger hormonal disruptions. A moderate deficit of 15-20% below TDEE is recommended for most people. Additionally, you should re-evaluate your calorie target every 5 kg lost because your TDEE decreases as your weight drops, meaning the same intake will eventually stop producing weight loss.