Human Body Energy Consumption Calculator

This calculator estimates your daily energy expenditure based on your age, weight, height, gender, and activity level. Understanding your energy consumption helps with nutrition planning, fitness goals, and overall health management.

How to Use This Calculator

To calculate your human body energy consumption:

Enter your age in years
Select your gender (male or female)
Enter your weight in kilograms
Enter your height in centimeters
Choose your activity level from the dropdown
Click "Calculate" to see your results

The calculator provides your Basal Metabolic Rate (BMR) and Total Daily Energy Expenditure (TDEE) in kilocalories per day.

Formula Used

The calculation uses the Mifflin-St Jeor equation to estimate Basal Metabolic Rate (BMR):

For men: BMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age in years) + 5

For women: BMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age in years) - 161

Total Daily Energy Expenditure (TDEE) is calculated by multiplying BMR by an activity factor:

Sedentary (little or no exercise): BMR × 1.2
Lightly active (light exercise 1-3 days/week): BMR × 1.375
Moderately active (moderate exercise 3-5 days/week): BMR × 1.55
Very active (hard exercise 6-7 days/week): BMR × 1.725
Extra active (very hard exercise, physical job): BMR × 1.9

Interpreting Results

Your BMR represents the calories your body needs at complete rest. Your TDEE accounts for physical activity and provides a more accurate estimate of your daily calorie needs.

For weight maintenance, consume approximately your TDEE. To lose weight, create a calorie deficit by consuming fewer calories than your TDEE. For muscle gain, create a calorie surplus by consuming more calories than your TDEE.

Worked Example

Let's calculate the energy consumption for a 30-year-old woman who weighs 65 kg, is 165 cm tall, and is moderately active:

BMR = (10 × 65) + (6.25 × 165) - (5 × 30) - 161 = 650 + 1031.25 - 150 - 161 = 1350.25 kcal/day
TDEE = 1350.25 × 1.55 = 2100.39 kcal/day

This woman would need approximately 2100 kcal/day to maintain her weight with moderate activity.

Frequently Asked Questions

What is the difference between BMR and TDEE?

BMR (Basal Metabolic Rate) is the number of calories your body needs to perform basic functions at rest. TDEE (Total Daily Energy Expenditure) accounts for your activity level and provides a more accurate estimate of your daily calorie needs.

How accurate is this calculator?

This calculator provides an estimate based on standard formulas. Individual results may vary due to factors like genetics, muscle mass, and overall health.

Can I use this for children or elderly people?

The formula used is most accurate for adults aged 18-65. For children and elderly people, specialized formulas may be more appropriate.