How many calories does your body use each day?
TDEE Calculator
Estimate your Total Daily Energy Expenditure (TDEE) based on your age, sex, height, weight, and activity level.
TDEE History
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Calculate your TDEE and your recent results will appear here.
Your data stays private. TDEE history is stored locally in this browser and is not sent to SlimDownToday.
How the TDEE Calculator Works
Enter your age, sex, height, and weight.
The calculator first estimates basal metabolic rate using the Mifflin-St Jeor equation.
Choose the activity option that most closely represents your typical routine.
Estimated BMR is multiplied by the selected activity factor to calculate estimated TDEE.
TDEE Formula
The answer is different for everyone.
Your body uses energy while you sleep, work, walk, exercise, eat, and perform everyday activities.
A TDEE Calculator can help you estimate the total number of calories your body uses in a typical day.
TDEE stands for Total Daily Energy Expenditure.
Knowing your estimated TDEE can help you better understand your calorie needs for maintaining, losing, or gaining weight.
What Is TDEE?
TDEE means Total Daily Energy Expenditure.
It is an estimate of the total number of calories your body uses during a day.
Your body uses calories for many activities, including:
- Breathing
- Circulation
- Digestion
- Walking
- Working
- Exercise
- Household activities
- Maintaining body temperature
- Other daily movement
Your TDEE combines these different energy needs into one estimated daily number.
For example:
Estimated TDEE: 2,400 calories per day
This means your body may use approximately 2,400 calories during an average day.
It is an estimate, not an exact measurement.
What Is a TDEE Calculator?
A TDEE Calculator is an online tool that estimates your Total Daily Energy Expenditure.
The calculator normally uses information such as:
- Age
- Sex
- Height
- Weight
- Activity level
First, it estimates your resting energy needs.
Then it adjusts that number based on your activity level.
The result is your estimated daily calorie expenditure.
How Does a TDEE Calculator Work?
A TDEE calculation normally starts by estimating your Basal Metabolic Rate, or BMR.
Your BMR represents the energy your body needs for basic functions at rest.
The calculator then considers your activity level.
A simple way to understand the process is:
BMR × Activity Factor = Estimated TDEE
For example:
Estimated BMR: 1,600 calories
Activity factor: 1.55
Calculation:
1,600 × 1.55 = 2,480
Estimated TDEE:
2,480 calories per day
The actual number of calories your body uses may be different.
What Is BMR?
BMR stands for Basal Metabolic Rate.
It is an estimate of how many calories your body needs to perform basic functions while at rest.
Even if you stayed in bed all day, your body would still need energy.
Your body uses energy to:
- Breathe
- Pump blood
- Support your brain
- Maintain body temperature
- Support your organs
- Repair cells
- Perform other basic functions
BMR usually represents a large part of your total daily energy expenditure.
BMR vs. TDEE
BMR and TDEE are related, but they are not the same.
BMR estimates the calories your body needs at rest.
TDEE estimates the total calories your body uses during the entire day.
For example:
BMR: 1,600 calories
After including daily activity:
TDEE: 2,300 calories
The difference comes from movement, exercise, digestion, and other daily activities.
What Makes Up Your TDEE?
Your total daily energy expenditure comes from several sources.
Basal Metabolic Rate
Your BMR represents the energy required for basic body functions.
Physical Activity
This includes planned exercise such as:
- Running
- Walking
- Cycling
- Swimming
- Strength training
- Sports
Daily Movement
Not all physical activity is exercise.
Your body also uses energy when you:
- Walk around your home
- Stand
- Clean
- Shop
- Work
- Use stairs
- Perform daily tasks
Digestion
Your body also uses energy to digest and process food.
All these factors contribute to your total daily energy expenditure.
How to Use the TDEE Calculator
Using our TDEE Calculator is simple.
Step 1: Enter Your Age
Enter your current age.
Age can affect estimated energy needs.
Step 2: Select Your Sex
Select the option requested by the calculator.
Some BMR formulas use different equations depending on sex.
Step 3: Enter Your Height
Enter your current height.
Make sure you use the correct measurement unit.
Step 4: Enter Your Weight
Enter your current body weight.
Step 5: Select Your Activity Level
Choose the activity level that best describes your normal lifestyle.
Step 6: Calculate
Click Calculate.
The calculator will estimate your TDEE and daily calorie needs.
Understanding Activity Levels
Choosing an activity level is an important part of estimating TDEE.
The options may look similar to these:
Sedentary
Little exercise and mostly sitting during the day.
Lightly Active
Some light exercise or regular daily movement.
Moderately Active
Regular moderate exercise and an active lifestyle.
Very Active
Frequent exercise or a physically demanding lifestyle.
Extra Active
High levels of exercise, physical work, or both.
These descriptions are general.
Your actual energy expenditure may be higher or lower than the estimate.
Why Activity Level Matters
Imagine two people who have similar:
- Age
- Height
- Weight
One person works at a desk and rarely exercises.
The other person works in a physically demanding job and exercises regularly.
Their BMR estimates may be similar.
However, their total daily energy expenditure may be very different.
This is why activity level is included in a TDEE Calculator.
What Are Maintenance Calories?
Your estimated TDEE is often used as an estimate of your maintenance calories.
Maintenance calories are the estimated calories needed to keep your body weight relatively stable over time.
For example:
Estimated TDEE: 2,500 calories
An estimated maintenance intake may be around:
2,500 calories per day
This does not mean your body will use exactly 2,500 calories every day.
Energy expenditure naturally changes from day to day.
TDEE for Weight Maintenance
If your average calorie intake is similar to your average energy expenditure, your body weight may remain relatively stable over time.
In simple terms:
Calories In ≈ Calories Out
For example:
Estimated TDEE: 2,300 calories
Average intake: approximately 2,300 calories
This may be close to your estimated maintenance level.
Actual results can vary.
TDEE for Weight Loss
People trying to lose weight often use TDEE as a starting point.
A calorie target below estimated TDEE creates an estimated calorie deficit.
For example:
Estimated TDEE: 2,400 calories
Daily intake: 2,000 calories
Estimated deficit:
2,400 – 2,000 = 400 calories
Over time, an energy deficit can contribute to weight loss.
However, a larger deficit is not automatically better.
Very restrictive calorie targets may not be appropriate for everyone.
TDEE for Weight Gain
TDEE can also be used when planning weight gain.
A calorie intake above estimated TDEE creates an estimated calorie surplus.
For example:
Estimated TDEE: 2,400 calories
Daily intake: 2,700 calories
Estimated surplus:
2,700 – 2,400 = 300 calories
Over time, an energy surplus can contribute to weight gain.
The amount and type of weight gained can depend on nutrition, exercise, genetics, and other factors.
TDEE for Muscle Gain
People who want to build muscle may use their estimated TDEE to help plan calorie intake.
However, eating above TDEE does not automatically mean that all additional weight will become muscle.
Muscle growth also depends on factors such as:
- Resistance training
- Protein intake
- Total nutrition
- Recovery
- Sleep
- Training experience
- Genetics
A TDEE estimate is only one part of a muscle-building plan.
TDEE and Calorie Deficit
TDEE is useful when calculating a calorie deficit.
The basic idea is:
TDEE – Calorie Intake = Estimated Calorie Deficit
For example:
TDEE: 2,600 calories
Calorie intake: 2,200 calories
Estimated deficit:
400 calories per day
This calculation is based on estimates.
Your actual calorie expenditure and intake may be different.
TDEE and Calorie Surplus
For weight gain, the calculation works in the opposite direction.
Calorie Intake – TDEE = Estimated Calorie Surplus
For example:
TDEE: 2,500 calories
Calorie intake: 2,800 calories
Estimated surplus:
300 calories per day
Again, this is a planning estimate.
Does TDEE Change?
Yes.
Your TDEE is not a permanent number.
It can change when your:
- Weight changes
- Activity level changes
- Exercise routine changes
- Age changes
- Body composition changes
- Lifestyle changes
For example, if you begin walking several miles every day, your average energy expenditure may increase.
If you become less active, it may decrease.
Does TDEE Change During Weight Loss?
It can.
As your body weight changes, your energy needs may also change.
For example, imagine you calculate your TDEE when you weigh 220 pounds.
After several months, you weigh 190 pounds.
Your original TDEE estimate may no longer represent your current energy needs.
Recalculating your TDEE after significant changes in weight or activity can provide a new estimate.
How Accurate Is a TDEE Calculator?
A TDEE Calculator provides an estimate.
It cannot directly measure exactly how many calories your body uses.
The result depends on:
- The BMR formula
- Your height
- Your weight
- Your age
- Your selected activity level
- Individual differences
Activity level can be especially difficult to estimate.
Two people who select “moderately active” may actually use different amounts of energy.
Why Is My Real TDEE Different?
Standard formulas are based on population data.
Your actual metabolism and activity may not perfectly match the estimate.
Factors that can affect energy expenditure include:
- Body composition
- Daily movement
- Exercise
- Genetics
- Age
- Health
- Medications
- Environment
This is why TDEE should be treated as a useful starting point rather than an exact daily requirement.
Can a Smartwatch Calculate TDEE?
Many fitness watches and activity trackers estimate daily calorie expenditure.
They may use information such as:
- Heart rate
- Steps
- Movement
- Exercise
- Age
- Height
- Weight
These devices can provide useful information, but their calorie estimates are still estimates.
A smartwatch and an online TDEE Calculator may therefore show different results.
TDEE Calculator vs. BMR Calculator
These two calculators answer different questions.
A BMR Calculator estimates how much energy your body needs for basic functions at rest.
A TDEE Calculator estimates your total daily energy expenditure after considering activity.
In simple terms:
BMR = Resting energy estimate
TDEE = Total daily energy estimate
TDEE Calculator vs. Calorie Calculator
A general Calorie Calculator may estimate calories for maintaining, losing, or gaining weight.
A TDEE Calculator focuses specifically on estimating your total daily energy expenditure.
TDEE is often used as the starting point for other calorie calculations.
TDEE Calculator vs. Calorie Deficit Calculator
A TDEE Calculator estimates how many calories you use during the day.
A Calorie Deficit Calculator uses that information to estimate a calorie target below your maintenance level.
For example:
TDEE → 2,400 calories
Then:
Calorie deficit → 400 calories
Estimated weight-loss calorie target:
2,000 calories
The two calculators work well together.
TDEE Calculator vs. BMI Calculator
A BMI Calculator uses your height and weight to calculate Body Mass Index.
A TDEE Calculator estimates your daily energy expenditure.
BMI describes weight relative to height.
TDEE estimates calories used per day.
They provide different types of information.
TDEE Calculator vs. Body Fat Calculator
A Body Fat Calculator estimates the percentage of your body weight that comes from fat.
A TDEE Calculator estimates daily energy expenditure.
Body composition can affect energy needs, but basic TDEE formulas may not directly measure body composition.
These tools can be used together to understand different aspects of your body and calorie needs.
How to Track Your TDEE Estimate
Your first TDEE calculation can be used as a starting point.
You can then track information such as:
Date → Weight → Calories → Activity
Over several weeks, you may see patterns in your body weight and calorie intake.
Remember that daily weight changes can happen because of water, food, sodium, carbohydrates, and other factors.
Longer-term trends are usually more useful than one day’s result.
Do You Need to Count Calories?
No.
Not everyone needs to count calories.
Some people find calorie tracking useful for understanding portions and energy intake.
Other people prefer to focus on:
- Meal quality
- Portion sizes
- Regular meals
- Protein
- Fruits and vegetables
- Physical activity
A TDEE Calculator gives you information.
How you use that information depends on your goals and needs.
Table of Contents
Frequently Asked Questions
What does TDEE mean?
TDEE stands for Total Daily Energy Expenditure. It estimates the total number of calories your body uses during a day.
What is a TDEE Calculator?
A TDEE Calculator estimates your daily calorie expenditure using information such as age, sex, height, weight, and activity level.
How is TDEE calculated?
A common approach is to estimate your BMR and multiply it by an activity factor.
TDEE = BMR × Activity Factor
What is the difference between TDEE and BMR?
BMR estimates your resting energy needs. TDEE estimates your total daily energy expenditure, including activity.
Is TDEE the same as maintenance calories?
Estimated TDEE is commonly used as an estimate of maintenance calories. Your actual maintenance needs may be somewhat different.
Can I use TDEE to lose weight?
TDEE can be used as a starting point for estimating a calorie deficit. A calorie target below estimated TDEE may create an energy deficit.
Can I use TDEE to gain weight?
Yes. A calorie intake above estimated TDEE creates an estimated calorie surplus, which can contribute to weight gain over time.
Can I use TDEE for muscle gain?
TDEE can help estimate your maintenance calories. However, muscle gain also depends on training, nutrition, protein, recovery, and other factors.
Does exercise increase TDEE?
Physical activity uses energy, so exercise can contribute to higher total daily energy expenditure.
Does walking count toward TDEE?
Yes. Walking and other normal daily movement contribute to total energy expenditure.
Does TDEE change as I lose weight?
It can. Your energy needs may change as your body weight, body composition, or activity level changes.
How often should I calculate my TDEE?
You can recalculate it when your weight, activity level, or lifestyle changes significantly.
Is a TDEE Calculator accurate?
It provides an estimate based on standard formulas. Your actual energy expenditure may be higher or lower.
Why is my smartwatch TDEE different?
Fitness trackers and online calculators may use different formulas and data. Both provide estimates rather than exact measurements.
Calculate Your TDEE
Knowing your estimated daily energy expenditure can help you better understand your calorie needs.
Our TDEE Calculator can help you estimate:
Basal Metabolic Rate (BMR)
Total Daily Energy Expenditure (TDEE)
Maintenance Calories
Enter your age, sex, height, weight, and activity level.
Then click Calculate to see your estimated daily calorie needs.
You can use your TDEE as a starting point when planning for weight maintenance, weight loss, or weight gain.
Remember that your result is an estimate and your actual energy needs may be different.
Disclaimer:
This TDEE Calculator provides estimates for informational and educational purposes only. Actual energy and calorie needs vary between individuals. Results depend on the formula used and the information entered, including activity level. This calculator does not provide medical or nutrition advice. If you have a medical condition, are pregnant or breastfeeding, are under 18, have a history of disordered eating, or have concerns about your calorie or nutrition needs, consult a qualified healthcare professional.
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