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A TDEE calculator answers the question that sits at the centre of every weight management plan: how many calories does my body actually burn in a day? Total Daily Energy Expenditure is the sum of everything — the energy your organs consume at rest, the calories you burn walking, fidgeting, exercising, and even digesting food. Enter your details into a TDEE calculator, and it returns a single number: your maintenance calories. Eat that amount and your weight stays stable. Eat less and you lose. Eat more and you gain. It is the foundation on which every sensible nutrition strategy is built.
Total Daily Energy Expenditure is not one number pulled from thin air. It is the sum of four distinct components, each contributing a different share of the total. Understanding them explains why two people of the same height and weight can have wildly different calorie needs.
Basal Metabolic Rate (BMR) is the largest component, accounting for roughly 60 to 75 percent of TDEE. This is the energy your body burns at complete rest to power the brain, heart, lungs, kidneys, and cellular repair. Muscle tissue is metabolically expensive to maintain, which is why people with more lean mass tend to have higher BMRs. The most accurate way to measure BMR is indirect calorimetry in a metabolic lab, but for everyday purposes, predictive equations provide a workable estimate.
Thermic Effect of Food (TEF) is the energy spent digesting, absorbing, and metabolising what you eat. It typically accounts for about 10 percent of TDEE, though the figure varies by macronutrient. Protein has the highest thermic effect at 20 to 30 percent, followed by carbohydrates at 5 to 10 percent, and fat at 0 to 3 percent. A high-protein diet therefore burns slightly more calories through digestion than a high-fat one.
Exercise Activity Thermogenesis (EAT) is the calories burned during intentional exercise. Despite what fitness trackers suggest, this is usually the smallest component for most people, contributing roughly 5 percent of TDEE. A hard workout burns calories, but it does not burn as many as most people assume.
Non-Exercise Activity Thermogenesis (NEAT) covers everything else: walking to the car, standing at a desk, carrying groceries, fidgeting, cooking. NEAT varies enormously between individuals and accounts for around 15 percent of TDEE on average. Two people with identical BMRs can differ by several hundred calories a day purely because one paces while on the phone and the other sits still.
Every TDEE calculator follows the same two-step process. First, it estimates your BMR. Second, it multiplies that figure by an activity factor. The most widely used BMR equation is the Mifflin-St Jeor formula, which has been validated in multiple studies and is recommended by organisations including the American Dietetic Association.
The Mifflin-St Jeor equation:
Once you have your BMR, multiply it by the activity factor that best describes your typical week:
| Activity Level | Description | Multiplier |
|---|---|---|
| Sedentary | Desk job, little or no exercise | 1.2 |
| Lightly active | Light exercise 1–3 days per week | 1.375 |
| Moderately active | Moderate exercise 3–5 days per week | 1.55 |
| Very active | Hard exercise 6–7 days per week | 1.725 |
| Extremely active | Very hard exercise, physical job, or twice-daily training | 1.9 |
For a 30-year-old man weighing 75 kg and standing 178 cm tall, the calculation runs as follows. BMR = (10 × 75) + (6.25 × 178) − (5 × 30) + 5 = 750 + 1,112.5 − 150 + 5 = 1,717.5. If he is moderately active, TDEE = 1,717.5 × 1.55 = approximately 2,662 calories per day. A free TDEE calculator performs this arithmetic instantly and removes the risk of manual error.
The two terms are often used interchangeably, which is a mistake. BMR is the floor — the calories you would burn if you lay in bed all day without moving, eating, or digesting. TDEE is the ceiling — the total you burn living your actual life, including every step, every meal, and every workout.
BMR is always lower than TDEE. For a sedentary person, TDEE may be only 20 percent higher than BMR. For an athlete training twice a day, TDEE can be double the BMR. When setting calorie targets for fat loss or muscle gain, TDEE is the number that matters. BMR is useful as a reference point, but eating at your BMR would put you in a severe deficit that is neither sustainable nor healthy for most people.
Once you have your TDEE, the rest of the plan falls into place. The number is your maintenance calories — the intake that keeps your weight stable. From there, you adjust in one direction or the other.
For weight loss, subtract 300 to 500 calories from your TDEE. A deficit of 500 calories per day produces roughly 0.5 kg (1 pound) of fat loss per week, which is a safe and sustainable rate. Research suggests that a deficit of 300 to 500 calories is sustainable for most people and minimises muscle loss during fat loss. Aggressive deficits of 1,000 calories or more may produce faster results on the scale, but they often lead to muscle loss, fatigue, and metabolic adaptation that makes further progress harder. Women should avoid dropping below 1,200 calories per day and men below 1,500 without medical supervision.
For maintenance, eat at your TDEE. This is the correct target for anyone satisfied with their current weight who wants to focus on performance, body composition, or simply building sustainable eating habits without the stress of a deficit or surplus.
For muscle gain, add 200 to 300 calories to your TDEE. A modest surplus supports muscle protein synthesis without excessive fat gain. A larger surplus accelerates weight gain but the extra weight is predominantly fat. Pair the surplus with progressive resistance training and adequate protein — roughly 1.6 to 2.2 grams per kilogram of body weight per day — to direct the extra calories toward muscle rather than fat.
Calories determine weight change. Macronutrients determine body composition, satiety, and performance. Once your calorie target is set, dividing it among protein, carbohydrates, and fat is the next step.
Protein should be prioritised. For sedentary or lightly active individuals, 1.0 to 1.2 grams per kilogram of body weight per day is adequate. For moderately to extremely active individuals, 1.4 to 2.2 grams per kilogram is more appropriate. Protein has the highest thermic effect of any macronutrient and is the most satiating, which makes it a powerful ally during a calorie deficit.
Carbohydrates are the body's preferred fuel for high-intensity exercise and brain function. Most people do well with 45 to 55 percent of total calories from carbohydrates, though athletes and very active individuals may benefit from a higher proportion.
Fat is essential for hormone production, vitamin absorption, and cell membrane integrity. A minimum of 0.5 grams per kilogram of body weight is generally recommended, with the remainder of calories coming from fat after protein and carbohydrate needs are met.
A macro calculator takes your TDEE and goal, then returns gram-level targets for each macronutrient so you can build meals that align with your plan.
No predictive equation is perfect. The Mifflin-St Jeor formula predicts resting metabolic rate within 10 percent of measured values for about 70 percent of people. That means the estimate can be off by 100 to 200 calories in either direction for a significant minority.
The bigger source of error is not the BMR equation — it is the activity multiplier. People consistently overestimate how active they are. A person who walks 4,000 steps a day and exercises twice a week is not "moderately active." They are lightly active at best. Choosing a multiplier that is too high inflates the TDEE estimate, which in turn inflates the calorie target, which stalls weight loss or even causes weight gain.
The solution is to treat the calculator's output as a starting point, not a final answer. Track your intake and your weight for two to three weeks. If your weight is stable and you want it to be, your calorie target is correct. If you are losing weight faster or slower than intended, adjust by 100 to 200 calories. A BMR calculator can give you a second reference point to cross-check the TDEE estimate.
Several recurring errors skew TDEE estimates and undermine the plans built on them.
TDEE varies by region and lifestyle. The TDEE calculator on Calculator200 is built on the Mifflin-St Jeor equation and applies the standard activity multipliers, making it suitable for users in India, the United States, the United Kingdom, Canada, Australia, and beyond. However, some regional considerations are worth noting.
In India, the Indian Council of Medical Research recommends approximately 1,900 calories for sedentary women and 2,100 calories for sedentary men. These are population-level guidelines for weight maintenance, not individual targets. A personalised TDEE calculation accounts for your specific height, weight, age, and activity level, which is why it is more useful than a blanket recommendation.
In the United Kingdom, NHS guidance recommends a daily calorie target of 2,000 for women and 2,500 for men as a general reference, but again these are population averages. The same principle applies: use your individual TDEE, not a national average.
A good TDEE calculator uses the Mifflin-St Jeor equation for BMR because it is the most accurate for the general population without requiring body fat percentage. It should ask for your age, sex, height, weight, and activity level, then apply the correct multiplier. Calculator200's TDEE calculator follows this standard and gives you maintenance calories plus deficit and surplus targets.
A TDEE calculator is an estimate, not a measurement. Research shows that predictive equations like Mifflin-St Jeor fall within 10% of measured resting metabolic rate for about 70% of people. Activity level self-reporting is the biggest source of error. Treat the number as a starting point and adjust based on two to three weeks of real-world results.
BMR is the calories your body burns at complete rest just to stay alive. TDEE is the total calories you burn in a full day including all movement, exercise, and digestion. TDEE is always higher than BMR. When setting a calorie target for weight loss or muscle gain, TDEE is the number that matters.
First calculate your BMR using the Mifflin-St Jeor equation: for men, 10 × weight in kg + 6.25 × height in cm − 5 × age + 5; for women, same formula but subtract 161 instead of adding 5. Then multiply your BMR by an activity factor: 1.2 for sedentary, 1.375 for light, 1.55 for moderate, 1.725 for very active, and 1.9 for extremely active.
The Mifflin-St Jeor equation is widely considered the best TDEE calculator formula for the general population. It was developed in 1990 and has been validated in multiple studies. The Katch-McArdle formula is more accurate for athletes and lean individuals because it uses lean body mass instead of total weight, but it requires a body fat measurement.
Start with your TDEE and subtract 300 to 500 calories per day for sustainable fat loss of roughly 0.5 to 1 pound per week. Women should not go below 1,200 calories per day and men should not go below 1,500 without medical supervision. A deficit that is too aggressive leads to muscle loss, fatigue, and metabolic adaptation.
A TDEE calculator is used to estimate your maintenance calories — the number of calories you need to eat to keep your weight stable. From there, you can set a calorie deficit for weight loss, a surplus for muscle gain, or use the number to plan your macronutrient intake for performance and body composition goals.
Yes. TDEE and maintenance calories refer to the same number: the total energy you expend in a day. If you eat exactly your TDEE, your weight stays the same over time. Eating below it creates a deficit and weight loss; eating above it creates a surplus and weight gain.
Your TDEE is not a fixed number carved in stone. It shifts with your weight, your activity, your age, and even your sleep and stress levels. It is a moving target, and the best strategy is to recalculate periodically, track your results honestly, and adjust based on what the scale and the mirror tell you. Use the TDEE calculator to find your starting point, set a target that matches your goal, and then let real-world feedback refine the plan. A number from a calculator is only useful if it is paired with consistency and a willingness to adapt.