Free TDEE & Calorie Calculator

How Many Calories Do You Actually Need?

The number of calories a person uses in a day is not one fixed number that applies to everyone. Daily energy needs vary because bodies differ in size, age, sex, activity, body composition, and daily movement.

That is why a useful calorie calculator should do more than return a generic calorie number.

This TDEE & Calorie Calculator estimates two important values: BMR and TDEE.

BMR stands for basal metabolic rate. It estimates how much energy your body would use for essential functions at rest.

TDEE stands for total daily energy expenditure. It estimates how much energy your body uses across an entire day after activity is considered.

Your TDEE is also commonly used as an estimate of your maintenance calories, meaning the approximate number of calories corresponding to maintaining your current body weight if your average activity and other conditions remain similar.

These numbers are estimates rather than direct measurements. Your actual energy use can vary from day to day.

What Is TDEE?

TDEE, or total daily energy expenditure, is an estimate of the total number of calories your body uses during a day. It describes the total amount of energy your body uses during a day, and that includes much more than formal exercise.

Your body uses energy while breathing, circulating blood, maintaining body temperature, supporting organs, digesting food, standing, walking, working, doing household tasks, fidgeting, exercising, and moving through everyday life.

That is why two people with the same height and weight can have different daily energy needs if their daily activity levels are different.

Ro's guide to TDEE and calorie planning explains TDEE as the total energy the body uses over a day and discusses using estimated TDEE as a guideline when planning calorie intake around weight goals.

What Is BMR?

BMR stands for basal metabolic rate. It estimates the energy your body uses for basic life-sustaining processes under resting conditions.

Even if you spent the day resting, your body would still require energy. Your heart keeps beating, your lungs continue exchanging air, your brain continues functioning, your cells continue performing maintenance, your organs continue working, and your body continues regulating temperature.

That baseline energy use is why BMR is not zero. This calculator uses the Mifflin-St Jeor equation as its default method for estimating BMR in adults.

What Is the Difference Between BMR and TDEE?

BMR estimates energy use at rest. TDEE estimates total energy use over the entire day. A simple way to remember the difference is: BMR equals baseline energy, and TDEE equals baseline energy plus a daily activity estimate.

For example, suppose your estimated BMR is 1,600 calories per day. If your selected activity factor is 1.55, then TDEE = 1,600 × 1.55, which equals 2,480 calories per day.

So in this example, BMR = 1,600 and TDEE = 2,480. The difference represents the effect of applying the activity estimate to your resting energy estimate.

If you want to explore resting energy by itself, use the separate CalculateThisWay BMR Calculator.

How Is TDEE Calculated?

Most simple TDEE calculators use a two-step process. First, estimate BMR. Second, multiply that estimated BMR by an activity factor. This calculator uses TDEE = BMR × Activity Factor.

For example, with a BMR of 1,650 calories per day and an activity factor of 1.55, the calculation is 1,650 × 1.55 = 2,557.5. Estimated TDEE is about 2,558 calories per day. That estimated TDEE can then be used as the maintenance-calorie starting point.

What Formula Does This TDEE Calculator Use?

This calculator uses the Mifflin-St Jeor equation to estimate adult BMR. For metric measurements, W is weight in kilograms, H is height in centimeters, and A is age in years.

Male equation: BMR = 10W + 6.25H - 5A + 5.

Female equation: BMR = 10W + 6.25H - 5A - 161.

After BMR is calculated, BMR × activity factor = estimated TDEE. When a user enters pounds, feet, and inches, the calculator converts those measurements internally before applying the equation.

How Do Activity Levels Affect TDEE?

Activity level can make a substantial difference in estimated daily calorie needs. This calculator uses activity multipliers: Sedentary 1.20, Lightly Active 1.375, Moderately Active 1.55, Very Active 1.725, and Extra Active 1.90.

Suppose someone's estimated BMR is 1,600 calories. At a sedentary factor, 1,600 × 1.20 = 1,920 calories. At a moderately active factor, 1,600 × 1.55 = 2,480 calories. At a very active factor, 1,600 × 1.725 = 2,760 calories. Same estimated BMR, different activity assumption, different estimated TDEE. This is why selecting an activity level carefully matters.

How Do I Choose the Right Activity Level?

Do not select an activity level based only on the number of formal workouts you complete. Think about your entire day. Ask: Do I sit at a desk most of the day? Do I spend hours walking at work? Do I work a physically demanding job? How often do I exercise? How difficult are those workouts? How much do I move outside of workouts?

For example, Person A exercises three times per week but works from a computer and spends most remaining hours sitting. Person B exercises three times per week but also works in a job that requires walking, carrying, and standing for hours. Those two people may not have identical total daily activity.

The activity factors used by TDEE calculators are estimates, so they should be treated as starting points rather than exact measurements.

What Are Maintenance Calories?

Maintenance calories are approximately equal to your estimated TDEE. Maintenance calories are the estimated calorie intake corresponding to your TDEE. If your estimated TDEE is 2,400 calories per day, then approximately 2,400 calories per day is your estimated maintenance level.

This does not mean your body will behave identically every day. Energy use changes with movement, training, sleep, body weight, body composition, food intake, and other factors. That is why a maintenance-calorie calculator provides an estimate rather than a guaranteed exact number.

What Is a Calorie Deficit?

A calorie deficit occurs when calorie intake is lower than energy expenditure. If your estimated TDEE is 2,400 calories and you choose a 10% deficit, the calculation is 2,400 × 0.90 = 2,160 calories. Estimated target: 2,160 calories per day.

The estimated daily calorie difference is 240 calories. Over seven days, 240 × 7 = 1,680 calories. This calculator can show that weekly energy difference. It should not convert the number into a guaranteed amount of body-weight loss. Real changes in body weight are more complicated than one fixed conversion.

What Is a 15% Calorie Deficit?

Using the same 2,400 calorie TDEE, a 15% deficit would be 2,400 × 0.85 = 2,040 calories per day. Daily difference: 360 calories. Weekly difference: 2,520 calories. Again, that describes the mathematical calorie difference. It does not guarantee a specific amount of weight loss.

What Is a 20% Calorie Deficit?

For 2,400 maintenance calories, a 20% deficit would be 2,400 × 0.80 = 1,920 calories per day. Daily difference: 480 calories. This is a larger reduction than a 10% or 15% scenario. The calculator presents it as a planning scenario, not a recommendation that every person should use it.

What Is a Calorie Surplus?

A calorie surplus occurs when calorie intake is higher than estimated daily energy expenditure. If TDEE is 2,400 calories and someone selects a 10% surplus, the calculation is 2,400 × 1.10 = 2,640 calories per day. The estimated daily difference is +240 calories.

Surplus scenarios can be useful for users researching calorie intake for weight gain, but the calculator does not guarantee how much body weight will be gained.

What Is My Calorie Deficit?

To estimate a calorie deficit: Step 1, estimate TDEE. Step 2, compare planned calorie intake with TDEE. For example, if estimated TDEE is 2,500 and planned intake is 2,150, the difference is 2,500 - 2,150 = 350 calories per day. That would be an estimated 350-calorie daily deficit. A person searching "what is my calorie deficit" should be able to understand this directly.

How Do You Calculate Maintenance Calories?

In this calculator, maintenance calories are approximately equal to TDEE. The process is: estimate BMR, multiply by the selected activity factor, and the result is estimated TDEE and maintenance calories. For example, with a BMR of 1,500 and an activity factor of 1.375, 1,500 × 1.375 = 2,062.5. Estimated maintenance is about 2,063 calories per day.

What Is a Calorie?

A calorie is a unit of energy. In nutrition, the word calorie usually refers to kilocalorie, or kcal. When a food label says 200 Calories, it generally means 200 kilocalories. Your body obtains energy from the foods and beverages you consume and uses that energy for both resting functions and activity.

Where Does TDEE Come From?

Daily energy expenditure can be discussed in several components. These commonly include resting energy expenditure, non-exercise activity, exercise activity, and the thermic effect of food.

What Is NEAT?

NEAT stands for Non-Exercise Activity Thermogenesis. It describes energy used during everyday physical activity that is not structured exercise. Examples can include walking around the house, standing, doing chores, walking through a store, moving during work, taking stairs, and fidgeting.

NEAT is one reason two people who perform similar workouts can still have different total daily energy expenditure.

What Is EAT?

EAT stands for Exercise Activity Thermogenesis. It describes energy used during intentional exercise. Examples include running, cycling, lifting weights, swimming, sports, and structured fitness classes. The amount varies depending on exercise type, duration, intensity, body size, and training volume.

What Is the Thermic Effect of Food?

The thermic effect of food, commonly called TEF, refers to energy used to digest, absorb, and process food. Different macronutrients require different amounts of energy to process. However, this calculator does not attempt to directly calculate personalized TEF from individual meals. Instead, it estimates TDEE using BMR and activity factor.

Does Protein Affect Energy Expenditure?

Protein generally requires more energy to digest than carbohydrate or fat. That does not mean this TDEE calculator should prescribe a protein intake. For users who want to estimate daily protein targets, see CalculateThisWay's active Protein Calculator.

Does TDEE Change?

Yes. Estimated TDEE can change when body weight changes, activity changes, exercise volume changes, occupation changes, body composition changes, or daily movement changes. That is why an old TDEE estimate should not automatically be treated as permanently accurate. Recalculate when there is a meaningful change in weight, activity, or routine.

How Often Should I Recalculate TDEE?

There is no universal schedule. A practical approach is to recalculate when something material changes, such as a significant body-weight change, an activity level change, a new job with different physical demands, a new training schedule, or a long period of reduced activity. Do not recalculate obsessively because of normal day-to-day scale changes. The calculator estimates average energy needs, not a perfectly precise daily burn.

Why Might My Real Maintenance Calories Be Different?

TDEE formulas use population-based estimates. They cannot directly measure your exact metabolism. Two people with similar age, height, weight, sex, and activity selection may still have different actual energy expenditure. Possible differences include body composition, daily movement, training history, measurement error, activity-selection error, and normal biological variation. A calculator should therefore be used as a starting estimate.

Is TDEE the Same as Calories Burned?

TDEE means estimated total energy used across an entire day. A Calories Burned Calculator usually estimates energy used during a particular activity or exercise session. Those are different questions. See the CalculateThisWay Calories Burned Calculator.

TDEE vs. BMR

BMR estimates energy used at rest. TDEE estimates total energy used over the day. Formula relationship: BMR × activity factor = estimated TDEE.

TDEE vs. RMR

BMR and RMR are related resting-energy concepts but are measured under somewhat different conditions. In everyday online calculator use, these terms are often discussed together. This calculator specifically uses Mifflin-St Jeor BMR estimation as the starting point for TDEE.

TDEE vs. BMI

BMI compares weight with height. TDEE estimates daily energy expenditure. They are not interchangeable. Use the BMI Calculator when you want BMI and height-based weight screening information. Use this TDEE & Calorie Calculator when you want BMR, maintenance calories, daily energy expenditure, or calorie deficit/surplus scenarios.

TDEE vs. Body Fat Percentage

TDEE estimates energy expenditure. Body-fat percentage estimates how much of body weight is fat mass. Body composition can affect energy expenditure, but these calculators answer different questions. See the Body Fat Calculator.

TDEE vs. Protein Calculator

TDEE answers approximately how many calories are associated with your daily energy needs. The Protein Calculator answers approximately how much protein might correspond to a person's size or goals. These tools are not merged, and you can link to the Protein Calculator where appropriate.

Why Doesn't This Calculator Promise Exactly How Much Weight I Will Lose?

Because body-weight change is dynamic. A common shortcut suggests that 3,500 calories corresponds to about one pound of body fat. But treating that as an exact weekly prediction ignores the fact that energy expenditure changes, body water changes, body mass changes, adherence varies, metabolism adapts, and weight does not change in a perfectly straight line.

Therefore this calculator shows estimated calorie targets, daily calorie differences, and weekly calorie differences without guaranteeing "You will lose exactly X pounds."

Is a Bigger Calorie Deficit Always Better?

No. A bigger mathematical deficit is simply a larger difference between estimated expenditure and planned intake. It does not automatically mean better, healthier, or more appropriate. The calculator presents multiple scenarios neutrally. It does not label a 20% deficit as "best," and it does not pressure users toward the lowest calorie option.

What Does "Free TDEE Calculator" Mean Here?

CalculateThisWay provides the calculator without requiring a sign-up. Users can estimate BMR, TDEE, maintenance calories, and calorie planning scenarios directly on the page. Calculator results are not placed behind an email gate, account, subscription, or paywall.

TDEE Calculator for Women

The calculation starts with a sex-specific Mifflin-St Jeor constant. Example: a woman, age 35, height 165 cm, weight 70 kg. Female BMR = 10(70) + 6.25(165) - 5(35) - 161 = 700 + 1,031.25 - 175 - 161 = 1,395.25, or about 1,395 calories per day.

Applying a Moderately Active factor of 1.55: TDEE = 1,395.25 × 1.55 ≈ 2,162.6, or about 2,163 calories per day. The result is an estimate based on the formula and selected activity level.

TDEE Calculator for Men

Example: a man, age 35, height 178 cm, weight 82 kg. Male BMR = 10(82) + 6.25(178) - 5(35) + 5 = 820 + 1,112.5 - 175 + 5 = 1,762.5, or about 1,763 calories per day.

Applying a Moderately Active factor of 1.55: TDEE = 1,762.5 × 1.55 ≈ 2,731.9, or about 2,732 calories per day. Again, every step is shown using the actual numbers for this example.

Can I Use TDEE to Lose Weight?

TDEE can provide a starting estimate for comparing energy expenditure with planned calorie intake. Ro's guide to TDEE and calorie planning describes using TDEE as a useful guideline for calorie planning while also recognizing that real energy expenditure can be difficult to know exactly.

Can I Use TDEE to Gain Weight?

A calorie surplus can be calculated mathematically by increasing estimated TDEE by a chosen percentage. Example: TDEE of 2,500 with a 10% surplus is 2,500 × 1.10 = 2,750 calories per day. This is an estimate, and the calculator does not promise a particular rate of weight gain.

Can I Use TDEE to Maintain My Weight?

Maintenance is the simplest scenario in the calculator. Estimated TDEE equals estimated maintenance calories. If TDEE is 2,350, then estimated maintenance is approximately 2,350 calories per day. Real maintenance can differ, so the number should be treated as a starting point.

How Accurate Is a TDEE Calculator?

A TDEE calculator is an estimate. It does not directly measure oxygen use, heat production, body composition, daily movement, or exact food intake. Its usefulness depends partly on accurate inputs, reasonable activity selection, and understanding that formulas estimate rather than directly measure metabolism.

Can Activity Trackers Give a Better TDEE?

Wearable devices can estimate energy expenditure using sensor data, but they are also estimates. Neither a wearable estimate nor an equation-based estimate should be treated as exact. Both approaches have uncertainty.

Why Does This Calculator Show BMR and TDEE Together?

Because BMR is the starting point and TDEE builds from it. Showing both numbers makes the result easier to understand. Instead of only seeing "2,400 calories," users can see BMR: 1,550, Activity factor: 1.55, TDEE: 2,403, Selected deficit: 10%, Estimated calorie target: 2,163. That transparency is one of the main goals of CalculateThisWay.

Common TDEE Calculator Mistakes

Choosing activity level based only on workouts

Your non-exercise daily activity also matters.

Confusing BMR with maintenance calories

BMR estimates resting energy. TDEE is the better maintenance-calorie estimate.

Treating the result as exact

TDEE is an estimate.

Assuming calorie deficits guarantee exact weight changes

They do not.

Using a children's age in an adult equation

This calculator is designed for adults age 18 or older.

Entering height incorrectly

For U.S. measurements, 5 ft 8 in does not mean 5.8 feet. Use separate feet and inches fields.

Mixing kilograms and pounds

The calculator handles conversions internally based on the selected unit system.

Choosing the most aggressive calorie deficit automatically

The calculator shows mathematical scenarios, not universal prescriptions.

What Should You Leave This Page Knowing?

Do not leave knowing only "My calorie number is 2,200." Leave knowing:

• I know what TDEE means.
• I know what BMR means.
• I understand that BMR and TDEE are different.
• I understand how my BMR was estimated.
• I know which activity multiplier was used.
• I can see how BMR became TDEE.
• I understand that TDEE is my estimated maintenance-calorie level.
• I understand how a calorie deficit is calculated.
• I understand how a calorie surplus is calculated.
• I can see the exact percentage used.
• I know my daily calorie difference.
• I know my weekly calorie difference.
• I know the calculator does not guarantee an exact amount of weight loss or gain.
• I understand that TDEE can change.
• I understand that daily movement matters, not only exercise.
• I know what NEAT means.
• I know what EAT means.
• I know what the thermic effect of food means.
• I know when the BMR Calculator is more relevant.
• I know when the BMI Calculator is more relevant.
• I know when the Protein Calculator is more relevant.
• I know when the Calories Burned Calculator is more relevant.

Most importantly: I understand how the number was calculated and what it can and cannot tell me. That is the CalculateThisWay standard.