What is TDEE?

TDEE (Total Daily Energy Expenditure) is the total number of calories you burn in a day. Whether your goal is weight loss, muscle gain, or weight maintenance, understanding your TDEE is the first step to creating an effective diet plan.

TDEE consists of four components:

BMR (Basal Metabolic Rate): Approximately 60-70% of TDEE. This is the energy your body needs to maintain basic life functions while at complete rest, including breathing, heart rate, and body temperature regulation.
TEF (Thermic Effect of Food): Approximately 10% of TDEE. This is the energy spent digesting, absorbing, and metabolizing food. Protein has the highest TEF (20-30%), followed by carbohydrates (5-10%), and fat has the lowest (0-3%).
NEAT (Non-Exercise Activity Thermogenesis): Approximately 15-30% of TDEE. This includes walking, standing, typing, housework, and other daily activities. This component shows the greatest individual variation.
EAT (Exercise Activity Thermogenesis): Approximately 5-10% of TDEE. This is the energy burned during intentional exercise like running, weight training, swimming, etc.

Why is TDEE Important?

Understanding your TDEE is the foundation for setting diet goals. Based on your objectives, you need to adjust your calorie intake:

Weight Loss Goal

If you want to lose weight, you need to create a calorie deficit — eating less than your TDEE. The recommended deficit range is 300-500 calories/day, which translates to a healthy weight loss rate of about 0.3-0.5 kg per week.

Excessive calorie restriction (deficit over 1000 calories) can lead to:

Muscle loss
Metabolic slowdown
Nutritional deficiencies
Difficulty maintaining long-term

Weight Maintenance

If you're satisfied with your current weight, simply eat approximately equal to your TDEE.

Muscle Gain Goal

If you want to build muscle mass, you need to create a calorie surplus. The recommended surplus range is 200-300 calories/day, combined with adequate protein intake (1.6-2.2 grams per kg of body weight) and resistance training.

How to Calculate TDEE?

Step 1: Calculate BMR (Basal Metabolic Rate)

The most commonly used formula is the Mifflin-St Jeor formula, considered the most accurate method for estimating BMR:

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

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

Calculation Example

Let's say John is a 30-year-old male, 175 cm tall, weighing 70 kg:

BMR = 10 × 70 + 6.25 × 175 - 5 × 30 + 5 BMR = 700 + 1093.75 - 150 + 5 BMR = 1648.75 calories

Step 2: Multiply by Activity Factor

Based on your daily activity level, choose the corresponding activity factor:

Activity Level	Factor	Description
Sedentary	1.2	Little or no exercise, desk job
Lightly Active	1.375	Exercise 1-3 days/week, or job requires walking
Moderately Active	1.55	Exercise 3-5 days/week
Very Active	1.725	Exercise 6-7 days/week, intense training
Extremely Active	1.9	Physical job + daily exercise

Calculation Example (continued)

If John exercises 3-5 days per week (Moderately Active):

TDEE = 1648.75 × 1.55 = 2555 calories

Use Our Calculator

Don't want to do the math? Use our TDEE Calculator — just enter your info for instant results!

Common TDEE Calculation Mistakes

1. Overestimating Activity Level

This is the most common mistake. Many people think they're "Moderately Active" when they're actually "Lightly Active." Start with an activity factor one level lower than you think.

2. Ignoring "Hidden Calories"

Drinks, condiments, snacks, extra sauces when eating out... these "hidden calories" are easily overlooked but can add up to over 500 calories.

3. Weekend Binge Eating

Strictly controlling on weekdays but indulging on weekends can negate an entire week's effort. One big meal out can easily reach 2000-3000 calories.

4. Only Looking at Weight Changes

Weight can be affected by water, bowel movements, and women's menstrual cycles. Watch the 2-4 week weight trend rather than daily fluctuations.

How to Adjust Your Diet Based on TDEE?

Week 1: Observe and Record

First, use Eatmoji to record your current diet and understand your actual calorie intake. Many people are surprised to find they eat more than they thought.

Starting Week 2: Gradual Adjustment

Don't drastically change your diet all at once. Adjust by 100-200 calories per week to let your body gradually adapt.

Every 2-4 Weeks: Re-evaluate

As your weight changes, your TDEE will also change. After losing 5 kg, your TDEE might decrease by 100-200 calories. Recalculate regularly to ensure your diet plan is still effective.

Frequently Asked Questions

Q: Does TDEE change?

Yes! TDEE changes with your weight, age, and activity level. Recalculate every 2-4 weeks. Additionally, long-term dieting can lead to metabolic adaptation, causing TDEE to decrease.

Q: How much should I eat to lose weight?

Start by subtracting 300-500 calories from your TDEE. Losing 0.3-0.5 kg per week is healthy and sustainable. If you're losing weight too fast, you might be losing muscle rather than fat.

Q: Why am I not losing weight even though I eat very little?

Possible reasons include:

Underestimating actual calorie intake (hidden calories)
Overestimating activity level
Metabolic adaptation (long-term dieting causing TDEE to decrease)
Stress or lack of sleep affecting metabolism

Try using Eatmoji to record every meal for more accurate calorie tracking!

Q: How accurate are TDEE calculators?

TDEE calculators provide estimates, and actual TDEE may vary by 10-15%. Use the calculated result as a starting point and adjust based on actual weight changes.

Q: Should I eat back exercise calories?

If the activity factor you chose already includes exercise, you don't need to add extra calories. If you had an unusually intense workout day, you can add an extra 100-200 calories.

Want to track daily calories more easily? Download Eatmoji — snap a photo to count calories, making food logging simple and fun!