Your Physiology

Energy Expenditure

Maintenance Calories (TDEE)
0 kcal/day
Basal Metabolic Rate (BMR)
0 kcal
Fat Loss Target (-500)
0 kcal
Muscle Gain Target (+500)
0 kcal

A TDEE (Total Daily Energy Expenditure) Calculator is one of the most important tools for planning your personal fitness journey. It calculates the total number of calories your body burns in a single 24-hour period. By understanding your TDEE, you can accurately determine exactly how much you need to eat to maintain, lose, or gain weight.

How TDEE is Calculated

The calculation requires two critical components: your Basal Metabolic Rate (BMR) and your physical activity level. The process uses the highly precise Mifflin-St Jeor equation to estimate your baseline energy needs.

  • Basal Metabolic Rate (BMR): This is the number of calories your body burns at complete rest, just to keep your vital organs functioning (breathing, circulating blood, cellular growth).
  • Activity Multiplier: Because nobody stays perfectly still all day, your BMR is multiplied by an activity factor ranging from 1.2 (for highly sedentary individuals) to 1.9 (for extreme athletes or heavy physical laborers).

How to Use Your TDEE Results

  • Maintenance: If you consume the exact number of calories indicated by your TDEE, your body weight will remain stable and unchanged.
  • Cutting (Fat Loss): To lose body fat, you must create a caloric deficit. Subtracting 500 calories from your TDEE is widely recommended for a safe and sustainable loss of about 0.5 kg (1 lb) per week.
  • Bulking (Muscle Gain): If you want to build muscle mass, you need to be in a caloric surplus. Adding roughly 300 to 500 calories to your TDEE provides the extra energy your body requires to synthesize new muscle tissue.

Frequently Asked Questions

Does my TDEE change if I lose weight?

Yes. As your body weight decreases, you require less energy to move your body and maintain your mass. You should recalculate your TDEE for every 3 to 5 kilograms (or roughly 10 pounds) of weight lost to ensure your caloric deficit remains effective.

Why is my BMR lower than my TDEE?

Your BMR strictly represents your coma-state caloric requirements. Even if you work a desk job and do not exercise, simply walking around your house, digesting food, and typing on a keyboard requires additional energy. That is why your TDEE is always higher than your BMR.

Is the TDEE calculation 100 percent accurate?

A TDEE calculator provides a highly educated mathematical estimate based on statistical averages. While it is incredibly close for the majority of people, individual variations in genetics, muscle density, and daily activity can shift the exact number. Use your calculated TDEE as a starting point and monitor your actual scale weight to make small adjustments.