Scientific Calorie Calculator
Calculate your Basal Metabolic Rate (BMR) and Total Daily Energy Expenditure (TDEE).
Male
Female
Sedentary (Little or no exercise)
Lightly Active (Exercise 1-3 days/week)
Moderately Active (Exercise 3-5 days/week)
Very Active (Hard exercise 6-7 days/week)
Extra Active (Very hard exercise & physical job)
Your Results
Basal Metabolic Rate (BMR):
0 kcal
Daily Maintenance (TDEE):
0 kcal
Weight Loss (-500 kcal):
0 kcal
Weight Gain (+500 kcal):
0 kcal
How to Calculate Calorie Needs Manually
Understanding how many calories your body requires is the cornerstone of fitness and weight management. Our calculator uses the Mifflin-St Jeor Equation, which is currently considered the most accurate method for estimating metabolic rate in healthy adults.
The calculation is a two-step process. First, we determine your Basal Metabolic Rate (BMR)—the energy your body burns at rest to maintain vital functions like breathing and heart rate. Second, we apply an activity multiplier to find your Total Daily Energy Expenditure (TDEE).
The Formula:
• 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
• 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
Understanding Activity Multipliers
Once the BMR is calculated, it is multiplied by a factor based on your lifestyle:
- Sedentary (1.2): If you work a desk job and do little to no exercise.
- Moderately Active (1.55): If you engage in intentional exercise 3 to 5 times per week.
- Extra Active (1.9): For athletes or people with highly physical labor jobs.
Example Calculation
Let's look at a realistic example for a 30-year-old male who weighs 80kg, stands 180cm tall, and has a moderate activity level:
- BMR: (10 × 80) + (6.25 × 180) – (5 × 30) + 5 = 1,780 kcal.
- TDEE: 1,780 × 1.55 = 2,759 calories per day to maintain weight.
- Weight Loss: To lose roughly 0.5kg per week, he would aim for 2,259 calories (a 500-calorie deficit).
Why Accuracy Matters
While formulas provide a scientific baseline, individual metabolism can vary due to muscle mass, genetics, and hormonal health. It is recommended to use these numbers as a starting point and adjust your intake based on real-world progress over 2-4 weeks.