How many calories does my body burn per day?

The average adult burns between 1,600 and 3,000 calories daily . Your exact TDEE depends on your age, sex, weight, height, and activity level. Use the Mifflin-St Jeor formula or a free online calculator for a personalized estimate.

What is the difference between BMR and TDEE?

BMR is the energy your body needs at complete rest — just to keep organs functioning. TDEE adds your daily movement, exercise, and food digestion to BMR. TDEE is always higher than BMR, typically by 20–100% depending on activity.

How accurate are TDEE calculators?

TDEE calculators are accurate to within ±10–15% for most people. They are estimates based on population averages. Individual variation from genetics, hormones, and lifestyle means you should use the number as a starting point and adjust based on real results.

Should I eat below my TDEE to lose weight?

Yes. A calorie deficit of 300–500 calories below TDEE is widely recommended for sustainable fat loss. This produces about 0.25–0.5 kg of weight loss per week while preserving muscle mass and energy levels.

How often should I recalculate my TDEE?

Recalculate every 4–6 weeks if you're actively losing or gaining weight. For every 5 kg you lose, your TDEE drops by roughly 100–150 calories . Failing to update your numbers is one of the top reasons weight-loss plateaus occur.

What Is TDEE and How Do You Calculate It?

TDEE (Total Daily Energy Expenditure) is the total number of calories your body burns every single day. It combines your Basal Metabolic Rate (BMR) with the energy you spend through movement, exercise, and even digesting food. Most adults burn between 1,600 and 3,000 calories daily, yet a 2014 study in the International Journal of Obesity found that people underestimate their actual calorie intake by up to 47%. Understanding your TDEE closes that gap. It gives you the one number you need to lose fat, build muscle, or maintain your current weight with real accuracy. You can quickly estimate yours using a free online calculator.

What Is TDEE?

Total Daily Energy Expenditure is the complete picture of your daily calorie burn. Think of it as your body's energy budget — every heartbeat, every step, and every workout is part of it. Unlike BMR, which only measures what you burn lying perfectly still, TDEE accounts for real life.

TDEE is built from four components. Your BMR makes up roughly 60–70% of the total. The Thermic Effect of Food (TEF) — the energy cost of digesting meals — adds about 10%. Exercise Activity Thermogenesis (EAT) covers intentional workouts. And Non-Exercise Activity Thermogenesis (NEAT) includes everything from fidgeting to walking to your car.

The World Health Organization (WHO) uses energy expenditure data to set global dietary guidelines. Getting your personal TDEE right is the foundation of any evidence-based nutrition plan.

How TDEE Works

Calculating TDEE is a two-step process. First, you estimate your BMR. Then, you multiply it by an activity factor that reflects your lifestyle.

Step 1 — Calculate Your BMR

The two most widely used formulas are the Mifflin-St Jeor equation (1990) and the Harris-Benedict equation (revised 1984). Research published by the American Dietetic Association found Mifflin-St Jeor to be the most accurate for most people, within ±10% of measured values.

Mifflin-St Jeor Formula:

Men: BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age) + 5
Women: BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age) − 161

Step 2 — Multiply by Activity Factor

Activity Level	Description	Multiplier
Sedentary	Desk job, little exercise	BMR × 1.2
Lightly Active	Light exercise 1–3 days/week	BMR × 1.375
Moderately Active	Moderate exercise 3–5 days/week	BMR × 1.55
Very Active	Hard exercise 6–7 days/week	BMR × 1.725
Extra Active	Athlete or physical labor job	BMR × 1.9

Real-World Example

If you're a 30-year-old man, 80 kg, 178 cm, and moderately active:

BMR = (10 × 80) + (6.25 × 178) − (5 × 30) + 5 = 1,767.5 calories
TDEE = 1,767.5 × 1.55 = ~2,740 calories/day

To lose weight, you'd eat below that number. To gain muscle, you'd eat above it. An expert tip: NEAT can vary by up to 2,000 calories per day between individuals. Two people with the same workout routine can have wildly different TDEEs simply because one fidgets, stands, and walks more throughout the day.

TDEE — Key Facts and Figures

The NIH Body Weight Planner uses TDEE-based modeling and is one of the most accurate free tools backed by government research.
The WHO recommends that adults get at least 150 minutes of moderate activity per week — enough to shift most people from "sedentary" to "lightly active."
A 500-calorie daily deficit below your TDEE produces roughly 0.45 kg (1 lb) of fat loss per week, based on the classic 3,500-calorie rule. Newer research from the NIH suggests the real number varies over time as your metabolism adapts.
Muscle tissue burns about 6 calories per pound per day at rest, while fat burns only about 2 calories. More muscle = higher BMR = higher TDEE.

Formula	Year	Best For	Accuracy
Mifflin-St Jeor	1990	General population	±10%
Harris-Benedict (revised)	1984	Older adults, clinical settings	±12%
Katch-McArdle	1996	Lean / athletic individuals	±8% (requires body fat %)

⚠️ NOTE: Online TDEE calculators give estimates, not exact numbers. Your actual expenditure depends on genetics, hormones, sleep, stress, and metabolic adaptation. Treat the result as a starting point and adjust based on real-world results over 2–4 weeks.

Key Factors to Consider

Body composition matters more than body weight. Two people at 80 kg can have very different TDEEs if one has 15% body fat and the other has 30%. The leaner individual has more metabolically active muscle tissue.
Age decreases your TDEE. BMR drops by roughly 1–2% per decade after age 20. A 50-year-old burns meaningfully fewer calories at rest than a 25-year-old with the same weight and height.
Your activity level estimate is the weakest link. Most people overestimate how active they are. If you exercise three times a week but sit for the other 15 waking hours, "lightly active" is likely more accurate than "moderately active."
Hormones and medical conditions change the math. Hypothyroidism, PCOS, testosterone levels, and certain medications can reduce your actual TDEE by 10–20% compared to calculator estimates. Consult a healthcare professional if your results don't match your efforts.
Metabolic adaptation is real. During prolonged calorie restriction, your body can lower its TDEE by reducing NEAT, lowering thyroid output, and improving muscle efficiency. This is why weight loss often stalls after several weeks.

Common Mistakes People Make

Using BMR as their calorie target. BMR is your survival minimum — the energy you need while completely at rest. Eating at BMR level means you're already in a significant deficit. This leads to muscle loss, fatigue, and hormonal disruption. Use your TDEE, not BMR, as the baseline.
Choosing the wrong activity multiplier. Selecting "Very Active" because you go to the gym four times a week ignores the other 160+ hours in your week. Be honest about your total movement, not just your gym sessions. ⚠️ WARNING: Overestimating your activity level by even one tier can add 300–500 phantom calories to your target, stalling fat loss entirely.
Never recalculating. Your TDEE changes as your weight, age, muscle mass, and activity levels change. Recalculate every 4–6 weeks during active weight loss or muscle gain phases.
Ignoring the thermic effect of food. Not all calories are processed equally. Protein costs roughly 20–30% of its calories to digest, compared to 5–10% for carbs and 0–3% for fats. A higher-protein diet effectively raises your TDEE slightly.
Trusting fitness trackers blindly. Studies from Stanford University found that popular wrist-worn devices overestimate calorie burn by 27–93%. Use them for trends, not as absolute numbers.

Practical Tips

Start with the Mifflin-St Jeor formula. It is the most validated equation for healthy adults. Use a trusted online calculator to get your estimate in seconds, then fine-tune from there.

Track your weight for 2 weeks before adjusting. Eat at your calculated TDEE and weigh yourself daily at the same time. If your average weight stays flat, you've found your true maintenance. If it rises or drops, adjust by 100–200 calories.

Increase your NEAT before adding gym sessions. Walking 8,000–10,000 steps per day can burn an extra 300–500 calories — often more than a gym workout. It's also easier to sustain long-term.

Eat more protein to boost TEF. Aim for 1.6–2.2 g of protein per kg of body weight if you're active. This supports muscle retention and naturally increases your daily calorie burn through digestion.

Use a "diet break" every 8–12 weeks. Return to your TDEE maintenance calories for 1–2 weeks during extended fat-loss phases. Research suggests this counters metabolic adaptation and improves long-term results.

Log food by weight, not volume. A "cup of rice" can vary by 100+ calories depending on how tightly you pack it. A $10–$15 kitchen scale is the single most useful tool for accurate calorie tracking.

Your Next Step

Your TDEE is the single most useful number in nutrition — it tells you exactly how much fuel your body needs each day. Calculate yours now using a reliable online calculator, track your results for two weeks, and adjust from there. Small, data-driven changes beat guessing every time. Start today and let the numbers guide you.