🏃 TDEE Calculator
What is TDEE (Total Daily Energy Expenditure)?
TDEE (Total Daily Energy Expenditure) is the total number of calories your body burns in a single day, including everything from basic bodily functions like breathing and circulating blood to all your physical activities and exercise. Understanding your TDEE is the foundation of any effective weight management plan — whether you want to lose weight, gain muscle, or maintain your current weight, knowing your TDEE tells you exactly how many calories you should eat each day.
Unlike simple calorie calculators that only consider basic stats, a proper TDEE calculator accounts for your Basal Metabolic Rate (BMR) multiplied by your activity level, giving you a personalized daily calorie target that reflects your actual lifestyle. Our free TDEE calculator above uses the scientifically validated Mifflin-St Jeor equation — widely considered the most accurate BMR formula available — to calculate your precise daily energy expenditure.
How Does the TDEE Calculator Work?
Our TDEE calculator uses a two-step process to determine your daily calorie needs:
Step 1: Calculate Your BMR (Basal Metabolic Rate)
BMR is the number of calories your body burns at complete rest — the energy needed to keep your heart beating, lungs breathing, and organs functioning. We use the Mifflin-St Jeor equation, which was developed in 1990 and has been validated as the most accurate BMR formula for the general population:
For Men: BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age) + 5
For Women: BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age) − 161
Step 2: Multiply by Your Activity Factor
Once we have your BMR, the calculator multiplies it by an activity factor that represents your daily movement and exercise habits. This gives you your TDEE:
TDEE = BMR × Activity Factor
Activity Level Multipliers
| Activity Level | Multiplier | Description |
|---|---|---|
| Sedentary | 1.2 | Little or no exercise; desk job with minimal movement |
| Lightly Active | 1.375 | Light exercise or sports 1-3 days per week |
| Moderately Active | 1.55 | Moderate exercise or sports 3-5 days per week |
| Active | 1.725 | Hard exercise or sports 6-7 days per week |
| Very Active | 1.9 | Very hard exercise, physical job, or training twice daily |
How to Use Your TDEE for Weight Goals
Your TDEE represents your maintenance calories — the amount you need to eat to stay at your current weight. From there, adjusting your intake up or down creates a calorie surplus or deficit that drives weight change:
For Weight Loss
To lose weight, you need to eat fewer calories than your TDEE. A deficit of 500 calories per day typically leads to about 1 pound (0.45 kg) of fat loss per week. Our calculator shows three deficit levels:
- Mild Deficit (-250 cal/day): ~0.5 lb/week loss — sustainable long-term
- Moderate Deficit (-500 cal/day): ~1 lb/week loss — the standard recommendation
- Aggressive Deficit (-1000 cal/day): ~2 lb/week loss — short-term only, not below 1200 cal/day
For Muscle Gain / Bulking
To gain weight or build muscle, eat above your TDEE. A surplus of 250-500 calories per day supports lean muscle growth with minimal fat gain. The calculator shows three surplus levels:
- Mild Surplus (+250 cal/day): Lean bulk — minimal fat gain
- Moderate Surplus (+500 cal/day): Classic bulk — good muscle-to-fat ratio
- Aggressive Surplus (+1000 cal/day): Fast weight gain — expect some fat gain
For Weight Maintenance
Simply eat at your TDEE level. Your weight should remain stable within 1-2 pounds of normal daily fluctuation. Recalculate your TDEE every 10-15 pounds (5-7 kg) of weight change, as your calorie needs shift with your body composition.
Factors That Influence Your TDEE
Several key factors determine your total daily energy expenditure beyond just BMR and activity level:
Body Composition
Muscle tissue burns more calories at rest than fat tissue. A person with higher lean body mass will have a higher TDEE than someone of the same weight with less muscle. This is why strength training can boost your metabolism over time — adding muscle increases your BMR and, by extension, your TDEE.
Age
BMR naturally decreases with age — roughly 1-2% per decade after age 20 — primarily due to muscle loss (sarcopenia). Our calculator factors age into the Mifflin-St Jeor equation, but if you’re over 50 and active, your actual TDEE may be slightly higher than the estimate.
Non-Exercise Activity Thermogenesis (NEAT)
NEAT refers to all the calories you burn outside of intentional exercise — walking to the kitchen, fidgeting, standing instead of sitting, doing household chores. NEAT can vary by up to 2,000 calories per day between individuals of similar size and can be the difference between maintaining and gaining weight on the same calorie intake.
Thermic Effect of Food (TEF)
Digesting, absorbing, and metabolizing food burns calories — about 10% of your total intake. Protein has the highest TEF (20-30% of its calories are burned in digestion), followed by carbohydrates (5-10%) and fats (0-3%). This is one reason higher-protein diets can support weight loss — they slightly increase your TDEE through the thermic effect.
TDEE vs BMR: What’s the Difference?
| Feature | BMR | TDEE |
|---|---|---|
| Definition | Calories burned at complete rest | Total calories burned per day |
| Includes | Only vital functions (heart, lungs, brain) | BMR + activity + exercise + TEF + NEAT |
| Typical % of TDEE | 60-75% | 100% |
| Use for | Minimum calorie needs; medical baselines | Weight loss, gain, or maintenance planning |
| Changes with | Age, weight, height, gender | All BMR factors + daily activity and exercise |
Mifflin-St Jeor Equation: The Science Behind the Calculator
The Mifflin-St Jeor equation was developed by researchers Mifflin, St Jeor, and colleagues and published in the American Journal of Clinical Nutrition in 1990. It was created by studying 498 healthy individuals (both normal-weight and obese) and has since been validated by the Academy of Nutrition and Dietetics as the most accurate predictive equation for estimating resting metabolic rate in the general population.
Why Mifflin-St Jeor Over Harris-Benedict?
The older Harris-Benedict equation (1919) tends to overestimate BMR by 5-15% in modern populations, particularly in individuals with higher body fat percentages. The Mifflin-St Jeor equation was specifically designed to be more accurate across diverse body types and is now the standard used by dietitians, personal trainers, and health professionals worldwide.
How Accurate Is the TDEE Calculator?
Research shows that the Mifflin-St Jeor equation predicts BMR within ±10% of measured values for approximately 80% of the population. However, individual variation exists. The most accurate way to measure your true TDEE is through indirect calorimetry in a lab, but for practical, everyday use, the Mifflin-St Jeor-based calculation is reliable enough to guide your nutrition and fitness decisions.
Tips for Best Results
- Be honest about your activity level — most people overestimate their exercise. If you have a desk job and exercise 3 times a week, select “Lightly Active,” not “Moderately Active.”
- Track your actual intake and weight for 2-3 weeks at your calculated TDEE. If your weight is stable, the estimate is accurate. If you’re gaining, your TDEE may be slightly lower.
- Recalculate regularly — every 10-15 pounds of weight change, your TDEE should be recalculated.
- Consider using a food scale for accurate calorie tracking alongside your TDEE calculation.
Frequently Asked Questions
What is a good TDEE for weight loss?
A good TDEE for weight loss depends on your individual stats, but the key is creating a deficit. For most people, subtracting 500 calories from their TDEE produces sustainable weight loss of about 1 pound per week. For example, if your TDEE is 2,500 calories, aim for 2,000 calories per day. Never go below 1,200 calories/day for women or 1,500 calories/day for men without medical supervision.
How do I calculate my TDEE manually?
First, calculate your BMR using the Mifflin-St Jeor formula: for men, BMR = (10 × weight kg) + (6.25 × height cm) − (5 × age) + 5. For women, BMR = (10 × weight kg) + (6.25 × height cm) − (5 × age) − 161. Then multiply by your activity factor: sedentary (1.2), lightly active (1.375), moderately active (1.55), active (1.725), or very active (1.9).
Does TDEE include exercise calories?
Yes, TDEE includes all calories burned from exercise and physical activity — that’s the “E” in TDEE: Expenditure. The activity factor multiplier accounts for your weekly exercise routine. If you selected “Moderately Active,” your TDEE already includes calories burned during 3-5 weekly workouts.
What’s the difference between TDEE and maintenance calories?
They are the same thing. Your TDEE is your maintenance calories — the number of calories you need to eat daily to maintain your current weight. The terms are interchangeable in nutrition and fitness contexts.
How often should I recalculate my TDEE?
Recalculate your TDEE every time you lose or gain 10-15 pounds (5-7 kg). Your calorie needs decrease as you lose weight (a smaller body burns fewer calories) and increase as you gain weight. For the most accurate tracking, recalculate monthly even if your weight hasn’t changed significantly.
Why is my TDEE higher than expected?
Several factors can cause a TDEE estimate to be higher than what you experience in real life: overestimating your activity level (the most common cause), having an endomorph body type with naturally slower metabolism, certain medications (beta-blockers, antidepressants), or hormonal conditions like hypothyroidism. If you’re eating at your calculated TDEE and gaining weight, your activity multiplier may be too high — try the next level down.
Can I use TDEE for building muscle?
Absolutely. To build muscle, aim for a 250-500 calorie surplus above your TDEE, paired with a progressive resistance training program and adequate protein intake (1.6-2.2g per kg of body weight). A smaller surplus (+250 cal/day) minimizes fat gain during a lean bulk, while +500 cal/day provides more energy for workouts and recovery.
Practical Tips for Using Your TDEE
Track Your Food Intake
Use a food diary or tracking app for at least 2-3 weeks while eating at your calculated TDEE. This reveals whether the estimate is accurate for you. If your weight stays within 1-2 pounds of your starting weight, the calculation is correct. If you’re steadily gaining or losing, adjust by 100-200 calories and reassess after another week.
Don’t Forget NEAT
Non-exercise activity can significantly impact your TDEE. Simple changes like taking the stairs, walking during phone calls, standing at your desk, parking farther away, and doing household chores can add 300-500 extra calories burned per day — the equivalent of a moderate workout — without ever stepping into a gym.
Combine with Macro Tracking
Knowing your TDEE is the first step. Pair it with a macro breakdown for optimal results: typical recommendations are 40% carbohydrates, 30% protein, and 30% fat for general health, or adjust based on your specific goals (higher protein for muscle building, higher fat for keto diets).
Listen to Your Body
Numbers are a guide, not an absolute. Energy levels, workout performance, sleep quality, and hunger signals are equally important indicators of whether your calorie intake is appropriate. If you’re constantly tired and hungry on a 500-calorie deficit, consider a smaller deficit or a diet break.
Summary
The TDEE calculator is one of the most powerful tools in fitness and nutrition because it gives you a personalized starting point for any body composition goal. By combining scientifically validated equations with your individual activity level, you get a daily calorie target that reflects your actual energy needs. Whether your goal is weight loss, muscle gain, or simply understanding your body better, knowing your TDEE puts you in control of your nutrition. Use our free calculator above to discover your TDEE now and take the first step toward your goals.