Find out how many calories your body actually burns in a day. This calculator combines your Basal Metabolic Rate with your activity level to estimate your Total Daily Energy Expenditure, with built-in targets for cutting, maintaining, or bulking.
TDEE Calculator
Find your Total Daily Energy Expenditure
| Activity Level | Multiplier | TDEE |
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Disclaimer: This TDEE calculator provides an estimate based on the Mifflin-St Jeor equation and standard activity multipliers. Individual energy expenditure varies based on metabolism, body composition, genetics, and other factors. Use the result as a starting point and adjust based on your body's response over 2 to 3 weeks. Consult a healthcare professional or registered dietitian for personalized nutrition guidance.
How to Use This Calculator
Select your unit system and gender. Enter your age, height, and weight. Then choose the activity level that honestly reflects your average week.
The most common mistake is overestimating activity. If you work a desk job and hit the gym three times a week, “Moderate” is more accurate than “Active.” The calculator shows a full activity table in the results so you can see how each level changes your number.
What is TDEE?
TDEE stands for Total Daily Energy Expenditure. It’s the total number of calories your body burns in a 24-hour period, including everything from breathing and digestion to walking and exercise. TDEE is made up of three components. Your BMR (Basal Metabolic Rate) accounts for roughly 60 to 70% of the total. The thermic effect of food (energy used to digest what you eat) adds about 10%. Physical activity makes up the remaining 20 to 30%, though this varies widely depending on how active you are.
What is the difference between BMR and TDEE?
BMR is what your body burns at complete rest. If you stayed in bed all day and did nothing, your body would still burn this many calories just to keep your organs running, your blood circulating, and your cells repairing.
TDEE takes your BMR and multiplies it by an activity factor to reflect real-world calorie burn. It’s the more useful number for diet planning because it accounts for how you actually live, not just how your body functions at rest.
What do the Results Mean?
TDEE is your maintenance number. Eat at this level and your weight stays roughly the same over time.
Cut (-20%) is your TDEE reduced by 20%. This creates a moderate calorie deficit that supports fat loss at a sustainable rate, roughly 0.5 to 1 kg (1 to 2 lbs) per week. A 20% deficit is large enough to see results but small enough to preserve muscle and avoid metabolic slowdown.
Maintain is your TDEE as calculated. Use this if your goal is body recomposition (gaining muscle while losing fat at the same weight) or simply maintaining current weight.
Bulk (+20%) is your TDEE increased by 20%. This creates a calorie surplus for muscle gain when paired with strength training. A 20% surplus supports lean muscle growth without excessive fat gain.
Why does activity level change TDEE so much?
Because physical activity is the most variable component of energy expenditure. Your BMR is largely fixed by your body size, age, and gender. But the gap between “sedentary” and “very active” can be 800 to 1,200 calories per day.
The results include a breakdown table showing your TDEE at every activity level. This is useful for two reasons. First, it helps you pick the right level by seeing how the numbers change. Second, it shows what happens to your calorie needs if your activity changes, like during a vacation or an injury recovery.
What formula does this calculator use?
This calculator uses the Mifflin-St Jeor equation, published in 1990. It’s considered the most accurate widely available formula for estimating BMR. The Academy of Nutrition and Dietetics recommends it for clinical use.
The equation calculates BMR from weight, height, age, and gender. That BMR is then multiplied by a standard activity factor (ranging from 1.2 for sedentary to 1.9 for very active) to estimate TDEE.
Comparative research shows the Mifflin-St Jeor equation predicts resting metabolic rate within 10% of measured values for about 82% of people. That’s better than the older Harris-Benedict equation and most other commonly used formulas.
How accurate is a TDEE Calculator?
It’s a solid estimate, not an exact measurement. The BMR formula is accurate within about 10% for most people. The activity multipliers are standardized averages, not personalized measurements.
For precise TDEE measurement, you’d need either indirect calorimetry (a clinical test measuring oxygen consumption) or a multi-day metabolic ward study. For practical purposes, this calculator gives you a reliable starting point.
The best approach is to use the result for 2 to 3 weeks, track your weight, and adjust. If you’re losing weight faster than expected on the maintenance number, your actual TDEE is higher. If nothing’s changing, it may be lower.
Should I eat below my BMR?
Generally, no. Eating below your BMR for extended periods signals your body that energy is scarce. The response includes metabolic adaptation (your body burns fewer calories), muscle loss (your body breaks down muscle for fuel), hormonal disruption (especially thyroid and reproductive hormones), and increased hunger signals.
The 20% cut this calculator recommends keeps you above your BMR for most people while still creating a meaningful deficit. If the cut number falls below your BMR, consider a smaller deficit or increasing your activity level to raise your TDEE.
How often should I recalculate my TDEE?
Recalculate whenever your inputs change meaningfully. That includes losing or gaining more than 5 kg (10 lbs), a significant change in activity level (starting or stopping a training program), or aging by 5 or more years.
For active dieters, recalculating every 4 to 6 weeks makes sense. As you lose weight, your TDEE decreases because there’s less body mass to fuel. Failing to adjust creates a “plateau” where your deficit disappears because your body now burns less than it used to.
How is TDEE different from a Calorie Calculator?
They’re closely related but framed differently. A calorie calculator typically asks “how many calories should I eat?” and gives goal-based targets (lose, maintain, gain). A TDEE calculator asks “how many calories do I burn?” and shows the raw number before applying any goal.
This calculator does both. The main result is your TDEE (what you burn), and the goal cards show you what to eat based on that number. If you’ve already used our Calorie Calculator, the maintenance number should match.
Frequently Asked Questions
What is a good TDEE?
There’s no universal “good” TDEE. It depends entirely on your body size, age, gender, and activity level. A sedentary 55 kg woman might have a TDEE of 1,600 calories. A very active 90 kg man could be over 3,500. Neither is better or worse. It’s simply how much energy your body uses.
Can I increase my TDEE?
Yes. The most effective way is to increase physical activity, especially strength training. Building muscle raises your BMR (muscle tissue burns more calories at rest than fat tissue), which permanently increases your TDEE. Adding daily movement like walking also helps.
Why is my TDEE so low?
Low TDEE typically reflects smaller body size, lower muscle mass, sedentary lifestyle, or older age. If your TDEE seems surprisingly low, the most actionable lever is activity. Moving from “sedentary” to “light” can add 200 to 400 calories to your daily burn.
Is TDEE the same every day?
No. Your TDEE fluctuates based on how active you are each day. On rest days, it’s lower. On training days, it’s higher. The number this calculator gives is a daily average based on your overall activity pattern. Some people use different calorie targets for training and rest days.
Should I eat back exercise calories?
If your activity level already accounts for exercise (which it does in this calculator), you don’t need to eat back exercise calories on top of your TDEE. Your activity multiplier already factors in your training. Adding extra calories for workouts would double-count them.
How is TDEE different from BMR?
BMR is what you burn at complete rest. TDEE is BMR multiplied by your activity factor. TDEE is always higher than BMR and is the number you should use for diet planning.
Related Articles on DebugMD
- Benefits of Intermittent Fasting – IF doesn’t change your TDEE, but it changes when you consume your calories, which can make a deficit easier to sustain.
- Zone 2 Cardio: Benefits Most People Don’t Know About – The most efficient exercise intensity for increasing daily calorie burn without spiking hunger or overtraining.
- How to Lose Belly Fat – Understanding your TDEE is the first step. This guide covers what comes next.
Disclaimer: This TDEE calculator provides an estimate based on the Mifflin-St Jeor equation and standard activity multipliers. Individual energy expenditure varies based on metabolism, body composition, genetics, and other factors. Use the result as a starting point and adjust based on real-world results. Consult a healthcare professional or registered dietitian for personalized nutrition guidance.