Free TDEE Calculator

What is TDEE?

Total Daily Energy Expenditure (TDEE) is the total number of calories your body burns in a 24-hour period. It represents the sum of all energy your body uses to sustain life, process food, and perform physical activities throughout the day.

TDEE is composed of four main components:

• Basal Metabolic Rate (BMR): The largest component, accounting for 60-75% of TDEE. This is the energy your body needs to maintain basic physiological functions like breathing, blood circulation, cell production, and organ function while at complete rest.
• Thermic Effect of Food (TEF): Also known as diet-induced thermogenesis, this accounts for about 10% of TDEE. It is the energy required to digest, absorb, transport, and store the food you eat. Protein has the highest thermic effect (20-30%), followed by carbohydrates (5-10%) and fats (0-3%).
• Exercise Activity Thermogenesis (EAT): The energy burned during deliberate physical exercise such as running, weightlifting, swimming, or cycling. This can range from 5% of TDEE for sedentary individuals to 30% or more for highly active people.
• Non-Exercise Activity Thermogenesis (NEAT): The energy burned through all daily movements that are not deliberate exercise -- walking, fidgeting, standing, housework, typing, and other routine activities. NEAT can vary dramatically between individuals, from as little as 200 calories to over 2,000 calories per day.

Understanding your TDEE is fundamental to any weight management goal. To lose weight, you eat fewer calories than your TDEE. To gain weight, you eat more. To maintain weight, you match your calorie intake to your TDEE.

How TDEE is Calculated

Calculating TDEE is a two-step process. First, you determine your Basal Metabolic Rate (BMR), then you multiply it by an activity factor that accounts for your daily physical activity level.

Step 1: Calculate BMR using the Mifflin-St Jeor Equation

The Mifflin-St Jeor equation (1990) is considered the most accurate BMR formula for most individuals by the Academy of Nutrition and Dietetics:

Step 2: Multiply BMR by Activity Factor

Example: A 30-year-old male, 175 cm tall, weighing 75 kg, who exercises moderately (3-5 days/week):

BMR = (10 × 75) + (6.25 × 175) - (5 × 30) + 5 = 750 + 1093.75 - 150 + 5 = 1,699 calories/day

TDEE = 1,699 × 1.55 = 2,633 calories/day

Activity Level Guide

Choosing the correct activity level is the most important decision when calculating your TDEE. Many people overestimate their activity level, which leads to an inflated TDEE and potential weight gain when they eat to match it. Here is a detailed guide to help you choose accurately:

Sedentary (Factor: 1.2)

• Desk job with no intentional exercise
• Mostly sitting during the day (driving, computer work, watching TV)
• Less than 5,000 steps per day
• This applies to most office workers who do not exercise regularly

Lightly Active (Factor: 1.375)

• Light exercise or sports 1-3 days per week
• Walking 30-60 minutes a few times per week
• A job that requires some walking or standing
• Approximately 5,000-7,500 steps per day

Moderately Active (Factor: 1.55)

• Moderate exercise or sports 3-5 days per week
• 30-60 minutes of exercise at moderate intensity
• Combination of gym workouts and active lifestyle
• Approximately 7,500-10,000 steps per day

Very Active (Factor: 1.725)

• Hard exercise 6-7 days per week
• 60-90 minutes of intense training daily
• Competitive athletes in training
• Physical jobs combined with regular exercise

Extra Active (Factor: 1.9)

• Very intense exercise daily, or twice-daily training
• Professional/elite athletes
• Very physically demanding jobs (construction, farming) combined with exercise
• Marathon or triathlon training

Tip: When in doubt, choose a lower activity level. It is better to slightly underestimate than to overestimate. You can always adjust upward based on real-world results after 2-3 weeks.

TDEE for Weight Loss and Weight Gain

Your TDEE is the cornerstone of any weight management strategy. The fundamental principle is simple: the relationship between your calorie intake and your TDEE determines whether you lose, gain, or maintain weight.

For Weight Loss

To lose weight, you must create a calorie deficit -- eating fewer calories than your TDEE. The size of the deficit determines the rate of weight loss:

• Mild deficit (-250 cal/day): Approximately 0.25 kg (0.5 lb) per week. Sustainable and comfortable for most people.
• Moderate deficit (-500 cal/day): Approximately 0.5 kg (1 lb) per week. The most commonly recommended rate for healthy, sustainable weight loss.
• Aggressive deficit (-1,000 cal/day): Approximately 1 kg (2 lbs) per week. More difficult to sustain and may increase muscle loss. Not recommended without medical supervision for most people.

Important: Never eat below 1,200 calories (women) or 1,500 calories (men) without medical supervision. Very low calorie diets can lead to nutrient deficiencies, muscle loss, metabolic adaptation, and other health problems.

For Weight Gain

To gain weight (particularly muscle mass), you need to eat more than your TDEE:

• Lean bulk (+250 cal/day): Approximately 0.25 kg per week. Minimizes fat gain while supporting muscle growth.
• Standard bulk (+500 cal/day): Approximately 0.5 kg per week. Faster muscle gain but with more accompanying fat.

For muscle gain, adequate protein intake (1.6-2.2 g per kg of body weight) combined with progressive resistance training is essential. Simply eating more calories without training will primarily result in fat gain.

For Weight Maintenance

To maintain your current weight, aim to eat approximately the same number of calories as your TDEE. In practice, a range of plus or minus 100 calories is sufficient, as minor daily fluctuations are natural.

NEAT: Non-Exercise Activity Thermogenesis

Non-Exercise Activity Thermogenesis (NEAT) is one of the most underappreciated and powerful components of your Total Daily Energy Expenditure. NEAT encompasses all the energy you burn through daily activities that are not deliberate exercise, sleep, or eating.

NEAT includes activities such as:

• Walking to and from your car, office, or store
• Fidgeting, tapping your feet, or shifting in your chair
• Standing instead of sitting
• Household chores (cooking, cleaning, laundry)
• Playing with children or pets
• Typing, writing, or other occupational activities
• Taking the stairs instead of the elevator
• Gardening and yard work

Why NEAT Matters

Research by Dr. James Levine at the Mayo Clinic has shown that NEAT can vary by up to 2,000 calories per day between individuals of similar size. This enormous variation helps explain why some people seem to "eat whatever they want" without gaining weight -- they unconsciously move significantly more throughout the day.

Studies have also shown that when people are overfed, those who naturally increase their NEAT (through more fidgeting, standing, and walking) gain significantly less fat than those whose NEAT does not change. Similarly, during calorie restriction, your body may unconsciously reduce NEAT as a survival mechanism, which can slow weight loss progress.

How to Increase Your NEAT

• Use a standing desk or alternate between sitting and standing
• Take phone calls while walking
• Park farther from your destination
• Take the stairs instead of the elevator
• Set a timer to stand and move every 30-60 minutes
• Walk or bike for short errands instead of driving
• Do household chores more frequently
• Aim for 8,000-10,000 steps per day

Increasing your NEAT is often more sustainable and effective for long-term weight management than relying solely on structured exercise sessions.

Understanding Macronutrients

Once you know your TDEE and calorie target, the next step is dividing those calories among the three macronutrients: protein, carbohydrates, and fat. Each macro provides a different number of calories and serves different functions in the body.

Our calculator uses a balanced macro split of 30% protein, 40% carbohydrates, and 30% fat. This distribution works well for most people with moderate activity levels. However, different goals may benefit from different ratios:

• Balanced (30/40/30): Good for general health, moderate exercise, and body recomposition.
• Low Carb (40/20/40): May benefit those with insulin resistance or who prefer higher fat and protein foods.
• High Carb (30/50/20): Suitable for endurance athletes and those doing high-volume training.
• Ketogenic (25/5/70): Very low carb, high fat. Used therapeutically and for certain weight loss approaches.

Regardless of the ratio, adequate protein intake is crucial -- especially during weight loss -- to preserve lean muscle mass. A minimum of 1.6 g of protein per kg of body weight per day is recommended for physically active individuals.

How Accurate is TDEE?

The Mifflin-St Jeor equation used in this calculator is the most accurate predictive equation for estimating BMR in healthy adults, with an accuracy of approximately plus or minus 10%. However, several factors can affect accuracy:

• Body Composition: The formula does not account for the ratio of muscle to fat. Individuals with more muscle mass will have a higher actual BMR than predicted, while those with higher body fat may have a lower actual BMR.
• Genetics: Metabolic rate varies between individuals by about 5-8% due to genetic factors.
• Hormonal Status: Thyroid function, cortisol levels, and reproductive hormones all influence metabolism. Conditions like hypothyroidism can lower BMR by 15-40%.
• Metabolic Adaptation: Prolonged calorie restriction can reduce BMR below predicted values as the body adapts to conserve energy.
• Activity Level Estimation: The activity multiplier is the largest source of error. Most people overestimate their activity level, and actual energy expenditure during exercise varies widely based on intensity, efficiency, and body weight.

How to Use Your TDEE Effectively

Treat your calculated TDEE as a starting point, not an absolute truth. Follow these steps for best results:

1. Calculate your TDEE using this tool.
2. Set your initial calorie target based on your goal (deficit, maintenance, or surplus).
3. Track your weight consistently (same time of day, same conditions) for 2-3 weeks.
4. If your weight is not changing as expected, adjust your calorie intake by 100-200 calories and repeat.
5. Recalculate your TDEE whenever your weight changes by 2-3 kg or your activity level changes.

References

1. Mifflin MD, St Jeor ST, et al. "A new predictive equation for resting energy expenditure in healthy individuals." Am J Clin Nutr, 1990.
2. Frankenfield D, Roth-Yousey L, Compher C. "Comparison of predictive equations for resting metabolic rate in healthy nonobese and obese adults." J Am Diet Assoc, 2005.
3. Levine JA. "Non-exercise activity thermogenesis (NEAT)." Best Pract Res Clin Endocrinol Metab, 2002.
4. Westerterp KR. "Physical activity and physical activity induced energy expenditure in humans." Br J Nutr, 2003.
5. Trexler ET, Smith-Ryan AE, Norton LE. "Metabolic adaptation to weight loss." J Int Soc Sports Nutr, 2014.
6. Jager R, et al. "International Society of Sports Nutrition Position Stand: protein and exercise." J Int Soc Sports Nutr, 2017.