TDEE Calculator: How to Find Your Daily Calorie Target

Every diet, meal plan, and nutrition coach starts with the same question: how many calories should you eat? The answer starts with your TDEE.

TDEE stands for Total Daily Energy Expenditure. It is the total number of calories your body burns in a day, including everything from breathing and digesting food to walking, exercising, and fidgeting at your desk.

Once you know your TDEE, you can set a calorie target that actually aligns with your goals instead of picking an arbitrary number from the internet.

Why TDEE Matters More Than You Think

Most people set calorie targets one of two ways: they pick a round number ("I will eat 1,500 calories") or they follow a generic rule ("cut 500 calories from your diet"). Both approaches ignore the most important variable: how many calories your specific body actually burns.

A 55 kg sedentary woman and a 90 kg active man could both "cut 500 calories," but 1,000 calories per day is a starvation diet for one and a moderate deficit for the other.

TDEE gives you a personalised starting point. Everything else builds from there.

How to Calculate Your TDEE

TDEE is calculated in two steps: find your Basal Metabolic Rate (BMR), then multiply it by an activity factor.

Step 1: Calculate Your BMR

BMR is the number of calories your body burns at complete rest. If you stayed in bed all day doing nothing, your BMR is the energy your body would use just to keep you alive: pumping blood, breathing, maintaining body temperature, repairing cells.

The most widely validated formula is the Mifflin-St Jeor equation:

Men: BMR = (10 x weight in kg) + (6.25 x height in cm) - (5 x age in years) + 5

Women: BMR = (10 x weight in kg) + (6.25 x height in cm) - (5 x age in years) - 161

Example: A 35-year-old man, 180 cm tall, weighing 85 kg:

BMR = (10 x 85) + (6.25 x 180) - (5 x 35) + 5
BMR = 850 + 1,125 - 175 + 5
BMR = 1,805 calories

Example: A 28-year-old woman, 168 cm tall, weighing 65 kg:

BMR = (10 x 65) + (6.25 x 168) - (5 x 28) - 161
BMR = 650 + 1,050 - 140 - 161
BMR = 1,399 calories

Why Mifflin-St Jeor?

You may have seen other formulas like Harris-Benedict or Katch-McArdle. Mifflin-St Jeor has been shown in research to be the most accurate for most people. Katch-McArdle can be more accurate if you know your body fat percentage, but most people do not have a reliable measurement of that.

Step 2: Apply Your Activity Multiplier

BMR tells you what your body burns at rest. But you do not lie in bed all day (hopefully). The activity multiplier accounts for everything else: exercise, walking, daily movement, and even the energy your body uses to digest food (called the thermic effect of food).

Continuing the example (35-year-old man, BMR 1,805, trains 4 days per week):

TDEE = 1,805 x 1.55 = 2,798 calories

For the 28-year-old woman (BMR 1,399, exercises 3 days per week):

TDEE = 1,399 x 1.55 = 2,168 calories

A Critical Warning About Activity Levels

Most people overestimate their activity level. This is the single biggest source of error in TDEE calculations.

If you work a desk job and go to the gym three times a week for an hour, you are "lightly active" to "moderately active." You are not "very active." Very active means consistent, hard training most days of the week combined with an active lifestyle outside the gym.

When in doubt, round down. It is easier to add calories later than to figure out why you are not making progress because your initial estimate was too generous.

Setting Your Calorie Target

Your TDEE is your maintenance level: the number of calories that keeps your weight roughly stable. To change your weight, you adjust from there.

For Fat Loss

Subtract 400 to 500 calories from your TDEE. This creates a moderate deficit that promotes fat loss while preserving muscle and energy levels.

TDEE 2,800: target ~2,300-2,400 calories
TDEE 2,200: target ~1,700-1,800 calories

Do not go below a 25% deficit (TDEE x 0.75) unless you are under medical supervision. Larger deficits increase muscle loss, tank your energy, and often lead to binge-restrict cycles.

A 1% body weight loss per week is a sustainable, evidence-based rate. For an 80 kg person, that is about 0.8 kg per week, which requires a deficit of roughly 800 calories per day. For most people, a 400-500 calorie deficit gets close to this target without feeling miserable.

For Muscle Gain

Add 200 to 300 calories above your TDEE. This is called a "lean bulk" and provides enough extra energy for muscle growth without excessive fat gain.

TDEE 2,800: target ~3,000-3,100 calories
TDEE 2,200: target ~2,400-2,500 calories

Larger surpluses do not build muscle faster. They just add more fat. Research consistently shows that the rate of muscle gain is limited regardless of how much extra food you eat. A small surplus maximises the muscle-to-fat gain ratio.

For Maintenance

Eat at your calculated TDEE. This is useful during periods where you want to maintain your current physique, recover from a long diet phase, or focus on performance without changing weight.

Why Your TDEE Calculation Might Be Wrong

Every formula is an estimate. Here are the factors that can throw your calculation off.

Metabolic Adaptation

If you have been dieting for a long time, your body may have adapted by burning fewer calories than the formula predicts. This is not "starvation mode" (a myth), but a real, measurable reduction of 5-15% in daily energy expenditure that happens during extended calorie restriction.

The fix: if you have been in a deficit for more than 12-16 weeks, consider a diet break at maintenance calories for 1-2 weeks before starting a new deficit phase.

Non-Exercise Activity Thermogenesis (NEAT)

NEAT is the energy you burn through all movement that is not intentional exercise: walking, fidgeting, standing, gesturing, even maintaining posture. NEAT can vary by 500-800 calories per day between individuals. It is the main reason two people with identical stats can have very different calorie needs.

NEAT also drops when you diet. Your body unconsciously moves less to conserve energy. This is one reason weight loss stalls: your body is quietly burning fewer calories through reduced NEAT without you noticing.

Muscle Mass

Muscle burns more calories at rest than fat. Two people who weigh the same but have different body compositions will have different BMRs. The standard formulas do not account for this well, which is why very lean, muscular individuals often find their TDEE is higher than calculated.

Hormonal Factors

Thyroid function, testosterone, oestrogen, cortisol, and other hormones all influence metabolic rate. If your calculated TDEE seems wildly off from your actual experience, it may be worth checking in with a doctor.

The Better Approach: Track and Adjust

Formulas give you a starting point. Your body gives you the answer. Here is how to dial in your actual TDEE using real-world data.

Week 1-2: Establish a Baseline

Eat at your calculated target and track two things:

Your daily calorie intake (as accurately as possible)
Your morning body weight (same time, same conditions, after using the bathroom)

Week 3-4: Analyse the Trend

Ignore day-to-day weight fluctuations. Look at the weekly averages.

Weight staying stable? Your calorie target is close to your true TDEE. Adjust for your goal from here.
Losing 0.5-1% body weight per week? Your deficit is in the right range.
Not losing weight? Your true TDEE is lower than estimated. Reduce calories by 100-150 or increase daily movement.
Losing more than 1% per week? Your deficit may be too aggressive. Consider adding 100-200 calories.

Ongoing: Recalculate as You Change

Your TDEE changes as your weight changes. Every 5 kg of weight loss reduces your TDEE by roughly 100-150 calories. This means the calorie target that worked at 90 kg will not work the same way at 80 kg. Recalculate every 4-6 weeks or whenever progress stalls for more than two weeks.

This is where tracking tools become valuable. Healthly monitors your intake and weight trends together, so it can flag when your current target is no longer producing results and suggest adjustments. No recalculation needed on your part.

TDEE FAQ

Can I just eat 1,200 calories and lose weight faster?

You can, but you probably should not. Very low calorie diets (below BMR) cause significant muscle loss, hormonal disruption, energy crashes, and almost always end in a rebound. A moderate deficit gets you to the same destination with more muscle, better energy, and a lower chance of regaining the weight.

Does my TDEE change on rest days versus training days?

Yes, but the difference is smaller than most people think. A hard gym session burns 200-400 extra calories. Some people use a "calorie cycling" approach (eating more on training days, less on rest days), but for beginners, a consistent daily target is simpler and equally effective.

What about the calories burned on my fitness tracker?

Fitness trackers overestimate calorie burn by 20-90% depending on the device and activity. Use them for trends (did I move more this week than last week?) but do not eat back every calorie your watch says you burned.

Is TDEE the same as BMR?

No. BMR is the calories you burn doing nothing. TDEE includes BMR plus activity, exercise, and the energy used to digest food. TDEE is always higher than BMR. For most people, TDEE is 1.3 to 1.8 times their BMR.

How accurate are online TDEE calculators?

They are reasonable estimates, usually within 10-15% of your actual TDEE. That is close enough for a starting point, but you should always validate with real-world tracking over 2-3 weeks. No calculator can account for your individual metabolism, NEAT patterns, or hormonal status.

Putting It All Together

Here is the process in five steps:

Calculate your BMR using the Mifflin-St Jeor equation
Multiply by your activity level (be honest, round down if unsure)
Adjust for your goal (subtract for fat loss, add for muscle gain)
Track your intake and weight for 2-3 weeks
Adjust based on real results, not what the formula says should happen

Your TDEE is not a fixed number. It is a moving target that changes with your weight, activity, and metabolic state. The formula gets you in the ballpark. Consistent tracking and honest self-assessment get you to the bullseye.

For a deeper understanding of how to split your TDEE into the right macro targets, read our complete macro counting guide. And if you want to understand how AI-powered tracking compares to manual logging, we have covered that too.