How this is calculated
Methodology
BMR (Mifflin-St Jeor) multiplied by activity factor (1.2 sedentary to 1.9 very active).
Reviewed by
Calc.Cards Editorial Team
Sources
- 1.Mifflin et al. (1990) Am J Clin Nutr
- 2.Institute of Medicine Dietary Reference Intakes for Energy (nal.usda.gov/fnic)
Your body is a machine that burns calories 24 hours a day, even while you sleep. Understanding exactly how many calories your body burns-your Total Daily Energy Expenditure-is the master key that unlocks effective nutrition planning. Stop guessing about calories. Calculate your TDEE and know precisely where you stand.
What This Calculator Does
Your TDEE calculator computes the total number of calories your body burns in a typical day. It starts by calculating your BMR (Basal Metabolic Rate)-the calories you burn at complete rest-then multiplies by your activity level multiplier to account for exercise and daily movement. The result is a single number that represents your entire daily calorie burn. Everything from fat loss to muscle gain hinges on whether you eat above, below, or equal to this number.
How to Use This Calculator
Enter your weight, height, age, and sex. These variables determine your BMR-your metabolic baseline. Then select your activity level honestly: sedentary (no regular exercise), lightly active (light exercise 1-3 days weekly), moderately active (3-5 days of moderate exercise), very active (intense training 6-7 days weekly), or extremely active (athlete or physical job). Your TDEE appears instantly, along with a clear explanation of how it's calculated.
You can also see how your TDEE changes if you adjust your activity level, giving you insight into how much difference adding workouts actually makes. This visibility is powerful: suddenly a 30-minute run isn't abstract-you can see its calorie impact.
The Formula Behind the Math
TDEE uses a two-step process. First, calculate BMR using the Mifflin-St Jeor formula:
For Men: (10 × weight kg) + (6.25 × height cm) - (5 × age) + 5
For Women: (10 × weight kg) + (6.25 × height cm) - (5 × age) - 161
Then multiply by your activity level:
Let's work through a real example. A 35-year-old man, 80 kg, 180 cm tall, moderately active:
BMR calculation:
TDEE calculation:
This man burns approximately 2,720 calories daily just by living and moving normally. If he eats 2,720 calories, he maintains weight. If he eats 2,400 calories, he's in a deficit and loses weight. If he eats 3,000 calories, he's in a surplus and gains weight.
Our calculator does all of this instantly-but now you understand exactly what it's computing.
Why Your BMR Matters
Your BMR-what you burn at complete rest-is roughly 60-75% of your total daily calorie burn. This reveals an important truth: your metabolism does most of the work. You could literally sit in bed all day and burn 1,500+ calories (depending on your size) just running your heart, brain, and organs. Exercise and daily activity add more on top, but your baseline is substantial. This is why very restrictive diets backfire: you're fighting against your own BMR, which is working hard even when you're resting.
Activity Level: The Game-Changer
The difference between "sedentary" and "very active" isn't small. The same 80 kg, 180 cm man with a BMR of 1,755:
That's a 921-calorie difference-more than a full meal. This is why adding regular exercise dramatically changes your calorie needs and makes fat loss easier. You're not just burning calories during the workout; you're increasing your daily baseline. It's compounding leverage.
Using TDEE for Nutrition Planning
Once you know your TDEE, everything else follows logically. For weight loss, eat 300-500 calories below it. For muscle gain, eat 300-500 calories above it. For maintenance, eat right at it. Your TDEE is the anchor point from which all other decisions flow. Forget about generic "eat 1,500 calories" advice-your TDEE is personalized to you.
How Changes Affect Your TDEE
Weight loss decreases your TDEE slightly (smaller body burns fewer calories). Weight gain increases it slightly. Age decreases it gradually (metabolism slows with time). Building muscle increases it permanently (muscle tissue is metabolically active). Adding cardio increases it. These aren't dramatic shifts, but they're real and they compound. After losing 10 pounds, recalculate your TDEE-you'll notice your maintenance calories have dropped a bit.
Tips and Things to Watch Out For
Be brutally honest about your activity level. This is where most people sabotage their own results. You're "moderately active" if you actually work out 3-5 times per week consistently-not if you "plan to" or "will be soon." If you can't commit to that frequency right now, use "lightly active." You can recalculate as your habits change. Overestimating your activity level means overestimating your calorie burn, which is how people plateau without understanding why.
Remember that TDEE is an estimate. The Mifflin-St Jeor formula is accurate for most people but varies individually. Some people have naturally faster or slower metabolisms due to genetics, medical conditions, or hormones. Use your calculated TDEE as a starting point. After 2-3 weeks of consistent eating at that level, assess your actual results and adjust up or down if needed.
Account for activity variations throughout the week. If you exercise intensely on Monday, Wednesday, and Friday but rest on weekends, your daily burn actually varies. Some people eat slightly more on training days and slightly less on rest days. Others average it out over the week. Both approaches work as long as your weekly total aligns with your goal.
Don't confuse TDEE with calories burned during exercise. Your TDEE already factors in your activity level. If you eat "your TDEE" and then go run a 10K on top of it, you're actually undereating. This is why some people do extra cardio on top of their planned activity-they intentionally create a bigger deficit. Know the difference.
This calculator provides general health information only. Always consult a qualified healthcare provider before making any medical or health decisions.
Frequently Asked Questions
How accurate is the TDEE calculator?
The Mifflin-St Jeor formula is accurate within about 10-20% for most people. Individual variation exists-your actual TDEE might be slightly higher or lower than calculated due to genetics, metabolism, hormonal factors, and lifestyle variables. Use the calculator as your starting baseline, track your results, and adjust based on what actually happens to your weight and body composition over weeks.
Should I recalculate my TDEE as I lose weight?
Yes. As you lose weight, your body is smaller and burns fewer calories, so your TDEE decreases. If you lose 10 pounds, recalculate-you may find your maintenance calories have dropped by 100-150 calories. This is normal and expected. If you don't recalculate and continue eating the same amount, your weight loss will naturally slow or plateau.
How do I know if my activity level is "moderate" vs. "very active"?
Moderately active means you exercise 3-5 days per week with moderate intensity (you can talk but not sing during exercise). Very active means 6-7 days per week or very intense training. If you're unsure, use the lower category and recalculate as your training increases. Overestimating activity level is one of the biggest obstacles to getting results.
Does TDEE account for my fitness level?
Not directly. The formula doesn't know whether you're a beginner or an athlete. However, the activity level multiplier captures this: an athlete training 6-7 days weekly uses 1.725 or 1.9, while someone exercising 3-5 days uses 1.55. If you're an athlete with very intense training, use the "extremely active" multiplier.
How much does building muscle increase my TDEE?
Muscle tissue burns roughly 6 calories per pound per day at rest (compared to fat, which burns 2 calories per pound). If you build 5 pounds of muscle, your BMR increases by about 30 calories. This isn't a massive boost, but it's real and it compounds. After a year of serious strength training, you might increase your TDEE by 100-150 calories-your metabolism working harder even when resting.
Can I use TDEE if I have a medical condition affecting metabolism?
Conditions like thyroid disorders, PCOS, and others can affect your actual calorie burn. Calculate your estimated TDEE as a starting point, but monitor your results closely and adjust based on what actually happens. Your doctor may have specific guidance on calorie targets given your condition. Don't rely solely on the formula if you know your metabolism is atypical.
Related Calculators
Your TDEE is the foundation of calorie planning. Use the Calorie Calculator to see how different deficits and surpluses affect your timeline. The BMR Calculator lets you explore your baseline metabolism in depth. The Macro Calculator breaks your daily calorie target into protein, carbs, and fat for optimal results. Together, these tools give you complete nutritional clarity.