TDEE Calculator: Calculate Your Total Daily Energy Expenditure

Finding your maintenance calories is the first step toward any body composition goal. Our TDEE calculator uses the Mifflin-St Jeor equation, which research published in the Journal of the American Dietetic Association found to be the most accurate formula for estimating resting metabolic rate in both normal weight and obese individuals. Simply enter your stats below to calculate your Total Daily Energy Expenditure, Basal Metabolic Rate, BMI, and personalized macro breakdown for your goals.

What is TDEE?

TDEE stands for Total Daily Energy Expenditure. It represents the total number of calories your body burns in a 24-hour period, accounting for all activities from breathing and digestion to exercise and daily movement.

Your TDEE consists of three main components:

1. Basal Metabolic Rate (BMR) - The calories your body burns at complete rest to maintain vital functions like breathing, circulation, and cell production. This typically accounts for 60-75% of your total daily burn.

2. Thermic Effect of Food (TEF) - The energy required to digest, absorb, and process the nutrients in your food. This accounts for roughly 10% of your calorie intake.

3. Physical Activity - All movement from structured exercise to walking around your house. This is the most variable component and the one you have the most control over.

How Our TDEE Calculator Works

Our calculator uses the Mifflin-St Jeor equation, which research has shown to be the most accurate formula for estimating resting metabolic rate in most people. A study published in the Journal of the American Dietetic Association compared several prediction equations and found Mifflin-St Jeor to be accurate within 10% for most individuals.

The Mifflin-St Jeor Equation

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

Activity Multipliers

Once your BMR is calculated, it’s multiplied by an activity factor:

Understanding Your Results

Using TDEE for Weight Loss

To lose weight, you need to consume fewer calories than your TDEE. Research suggests:

• Mild deficit (250 calories): Slow, sustainable fat loss of about 0.5 lb per week
• Moderate deficit (500 calories): Standard rate of 1 lb per week, recommended for most people
• Aggressive deficit (750-1000 calories): Faster results but harder to sustain, best for those with more weight to lose

A 2014 study in the International Journal of Obesity found that gradual weight loss through moderate caloric restriction resulted in better long-term maintenance compared to rapid weight loss approaches.

Using TDEE for Muscle Gain

Building muscle requires a caloric surplus combined with resistance training and adequate protein:

• Lean bulk (+250 calories): Minimizes fat gain while supporting muscle growth
• Standard bulk (+500 calories): Faster muscle gain with some fat accumulation
• Protein target: 0.7-1g per pound of body weight for optimal muscle protein synthesis

Macro Distribution Explained

Moderate Carb (30/35/35) - Balanced approach suitable for most active individuals. Provides adequate carbohydrates for energy while ensuring sufficient protein for muscle maintenance.

Lower Carb (40/20/40) - May benefit those who are insulin resistant, sedentary, or prefer higher fat intake for satiety. Higher protein supports muscle retention during fat loss.

Higher Carb (30/50/20) - Ideal for endurance athletes, high-volume training, or those who perform best with more carbohydrates. Supports glycogen replenishment and workout performance.

Factors That Affect Your TDEE

Several factors influence your Total Daily Energy Expenditure:

Age

Metabolic rate typically decreases by 1-2% per decade after age 20, primarily due to loss of muscle mass. Resistance training can help offset this decline.

Body Composition

Muscle tissue burns more calories at rest than fat tissue. Two people of the same weight can have significantly different BMRs depending on their muscle mass. This is why our calculator offers the Katch-McArdle formula option if you know your body fat percentage.

Hormones

Thyroid hormones, testosterone, estrogen, and cortisol all influence metabolic rate. Medical conditions affecting these hormones can cause TDEE to deviate from calculated estimates.

Genetics

Studies on identical twins suggest genetics account for approximately 40-70% of variation in metabolic rate between individuals.

NEAT (Non-Exercise Activity Thermogenesis)

Fidgeting, walking, standing, and other non-exercise movements can account for hundreds of calories daily. Research shows high NEAT individuals can burn 350+ more calories per day than those who are less active.

How to Use Your TDEE Results

1. Track your intake for 2-3 weeks at your calculated TDEE
2. Monitor your weight trends (weigh daily, look at weekly averages)
3. Adjust as needed - if losing weight, add 100-200 calories; if gaining, subtract
4. Recalculate every 10-15 pounds of weight change

Remember that TDEE calculators provide estimates. Your actual needs may vary by 10-15% depending on individual factors. Use your results as a starting point and adjust based on real-world results.

Related Calculators

• Sleep Calculator - Optimize your sleep schedule for better recovery
• Caffeine Calculator - Time your caffeine for better sleep and energy
• Protein Calculator - Calculate optimal protein intake for your goals

References

1. Mifflin MD, St Jeor ST, Hill LA, Scott BJ, Daugherty SA, Koh YO. A new predictive equation for resting energy expenditure in healthy individuals. Am J Clin Nutr. 1990;51(2):241-247.

2. Frankenfield D, Roth-Yousey L, Compher C. Comparison of predictive equations for resting metabolic rate in healthy nonobese and obese adults: a systematic review. J Am Diet Assoc. 2005;105(5):775-789.

3. Hall KD, Heymsfield SB, Kemnitz JW, Klein S, Schoeller DA, Speakman JR. Energy balance and its components: implications for body weight regulation. Am J Clin Nutr. 2012;95(4):989-994.

4. Levine JA. Non-exercise activity thermogenesis (NEAT). Best Pract Res Clin Endocrinol Metab. 2002;16(4):679-702.