Daily Energy Expenditure Calculator (TDEE)

Estimate the total number of calories you burn each day based on your personal metabolism and activity level. This tool helps you understand your energy needs to better manage your weight and health goals.

2,727 Calories/day

Your Total Daily Energy Expenditure (TDEE)

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Visual comparison of BMR vs. TDEE

What is Total Daily Energy Expenditure (TDEE)?

Total Daily Energy Expenditure (TDEE) is an estimation of how many calories you burn over a 24-hour period. It represents the total amount of energy your body uses to perform its basic functions and to move around. Understanding your TDEE is fundamental for managing your weight, whether your goal is to lose, maintain, or gain weight. If you consume more calories than your TDEE, you will gain weight; if you consume fewer, you will lose weight.

TDEE is calculated by first determining your Basal Metabolic Rate (BMR) and then multiplying it by an activity factor. It’s composed of three main components:

• Basal Metabolic Rate (BMR): The energy your body needs to maintain vital functions while at rest, like breathing, circulation, and cell production. This accounts for about 60-70% of your daily calorie burn.
• Thermic Effect of Food (TEF): The calories burned during the digestion and processing of the food you eat. It typically accounts for about 10% of your TDEE.
• Physical Activity: The energy expended during any movement, from walking to the kitchen to intense exercise. This is the most variable component of your TDEE.

TDEE and BMR Formulas

This calculator uses the Mifflin-St Jeor equation to estimate your Basal Metabolic Rate (BMR), as it is considered one of the most accurate methods available. Once the BMR is calculated, it’s multiplied by an activity level factor to find your TDEE.

TDEE Formula: TDEE = BMR × Activity Multiplier

Mifflin-St Jeor BMR Formulas:

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

Description of variables used in the BMR and TDEE formulas.

Variable	Meaning	Unit	Typical Range
Weight	Your body weight	kg or lbs	40 – 150 kg
Height	Your stature	cm or ft/in	140 – 210 cm
Age	Your age	Years	15 – 80
BMR	Basal Metabolic Rate	Calories / day	1,200 – 2,500
Activity Multiplier	A factor representing your daily physical activity	Unitless	1.2 – 1.9

Practical Examples

Example 1: Moderately Active Male

Let’s calculate the TDEE for a 35-year-old male who is 180 cm tall, weighs 80 kg, and is moderately active.

• Inputs: Male, 35 years, 80 kg, 180 cm, Moderately Active (Multiplier: 1.55)
• BMR Calculation: (10 × 80) + (6.25 × 180) – (5 × 35) + 5 = 800 + 1125 – 175 + 5 = 1755 kcal/day
• TDEE Calculation: 1755 × 1.55 = 2720 kcal/day
• Result: His estimated daily calorie need to maintain his current weight is 2720 calories.

Example 2: Lightly Active Female (Imperial Units)

Now, let’s calculate for a 45-year-old female who is 5’6″ tall, weighs 150 lbs, and is lightly active.

• Inputs: Female, 45 years, 150 lbs, 5’6″, Lightly Active (Multiplier: 1.375)
• Unit Conversion:
  • Weight: 150 lbs × 0.453592 = 68.04 kg
  • Height: (5 ft × 12 in/ft + 6 in) × 2.54 cm/in = 66 in × 2.54 = 167.64 cm
• BMR Calculation: (10 × 68.04) + (6.25 × 167.64) – (5 × 45) – 161 = 680.4 + 1047.75 – 225 – 161 = 1342 kcal/day
• TDEE Calculation: 1342 × 1.375 = 1845 kcal/day
• Result: Her estimated daily calorie need to maintain her weight is 1845 calories.

How to Use This TDEE Calculator

1. Select Your Units: Start by choosing between Metric (kg, cm) and Imperial (lbs, ft, in) units. The input fields will adjust accordingly.
2. Enter Your Details: Fill in your gender, age, weight, and height. Be as accurate as possible.
3. Choose Your Activity Level: Select the option that best describes your average weekly activity. This is a critical step for an accurate TDEE estimate.
4. Review Your Results: The calculator will instantly display your TDEE and BMR. The TDEE is the primary number to focus on for your daily calorie goals. The chart below the results provides a visual breakdown.
5. Use the Information: To lose weight, aim for a consistent calorie intake below your TDEE. To gain weight, aim for an intake above your TDEE. For weight maintenance, aim to eat around your TDEE.

Key Factors That Affect Daily Energy Expenditure

Several factors influence your TDEE. While our calculator accounts for the major ones, it’s helpful to understand the nuances:

• Body Composition: Muscle tissue is more metabolically active than fat tissue. An individual with more muscle mass will have a higher BMR than someone of the same weight with more body fat.
• Age: Metabolic rate naturally slows down as we age, partly due to a gradual loss of muscle mass. This is why the formula subtracts a value based on age.
• Gender: Men typically have a higher BMR than women because they generally have more muscle mass, less body fat, and are larger in size.
• Genetics: Your genes can play a role in your metabolic rate, predisposing you to a slightly faster or slower metabolism.
• Hormones: Hormones, particularly from the thyroid gland, can significantly impact your metabolic rate. An overactive or underactive thyroid can raise or lower your BMR.
• Climate and Body Temperature: Living in a very cold or very hot environment can increase BMR because your body has to work harder to maintain its normal temperature.
• Diet: Severe calorie restriction can cause your metabolism to slow down as your body tries to conserve energy. This is a survival mechanism.
• Non-Exercise Activity Thermogenesis (NEAT): This is the energy expended for everything we do that is not sleeping, eating, or sports-like exercise. It includes fidgeting, walking to the office, and typing. It can be a significant and highly variable part of TDEE.

Frequently Asked Questions (FAQ)

1. What is the difference between BMR and TDEE?

BMR (Basal Metabolic Rate) is the number of calories your body burns at complete rest (e.g., if you were in a coma). TDEE (Total Daily Energy Expenditure) includes BMR plus all the calories you burn from physical activity and digesting food. TDEE is always higher than BMR.

2. How accurate is this calculator?

This calculator uses the Mifflin-St Jeor formula, which is widely regarded as one of the most accurate estimation methods. However, it is still an estimate. Individual variations in genetics, body composition, and hormones can lead to differences. The most accurate way to measure metabolic rate is in a clinical setting.

3. Should I eat my TDEE to lose weight?

No. To lose weight, you need to create a calorie deficit, meaning you should consume fewer calories than your TDEE. A common recommendation is to subtract 300-500 calories from your TDEE for a sustainable weight loss of about 0.5-1 lb per week.

4. What activity level should I choose?

Be honest and realistic. Most people who work desk jobs and exercise 3 times a week are “Moderately Active.” If you are unsure, it’s often better to choose a slightly lower activity level and adjust based on your weight change over a few weeks.

5. Why is my BMR lower than I expected?

BMR is often surprisingly low. It only accounts for the energy needed for basic survival, not for any movement. The average male BMR is around 1700 kcal/day, while the average for females is lower. Your activity level is what significantly increases your total burn.

6. Does eating protein increase my TDEE?

Yes, slightly. This is due to the Thermic Effect of Food (TEF). Protein has the highest TEF, meaning your body uses more energy (about 20-30% of the calories in the protein) to digest it compared to carbs (5-10%) and fats (0-3%).

7. How often should I recalculate my TDEE?

It’s a good idea to recalculate your TDEE every few months, or after a significant change in weight (loss or gain of 10+ lbs/5+ kg) or a major change in your weekly activity level. Your energy needs will change as your body changes.

8. Can I use this calculator for children?

No. The formulas used here (Mifflin-St Jeor) are designed and validated for adults (18+). Children and adolescents have different energy needs for growth and development, and a pediatrician or registered dietitian should be consulted.