Calorie Needs Calculator
Estimate daily caloric needs based on age, gender, height, weight, and activity level using the Mifflin-St Jeor equation.
Medical Disclaimer
This calculator provides estimates based on the Mifflin-St Jeor equation for informational purposes only. Individual caloric needs vary based on many factors. Consult a registered dietitian or healthcare provider for personalized nutrition advice, especially if you have medical conditions.
What This Calculator Does
This calculator estimates your Total Daily Energy Expenditure (TDEE) using the Mifflin-St Jeor equation, which is considered the most accurate formula for estimating basal metabolic rate (BMR). It provides calorie targets for maintenance, weight loss, and weight gain.
The Formula
W = weight in kg, H = height in cm, A = age in years. BMR represents calories burned at complete rest. Multiplying by an activity factor (1.2-1.9) estimates total daily calorie needs.
Step-by-Step Example
Enter personal info
Input age, biological sex, height, and weight.
Select activity level
Choose from sedentary to extra active based on your weekly exercise habits.
Calculate
Example: 30-year-old male, 178cm, 77kg, moderately active. BMR = 1,731. TDEE = 2,683 cal.
Use goal targets
For weight loss, eat 250-500 calories below TDEE. For gain, eat 250-500 above.
Real-World Use Cases
Weight Management
Understand your calorie baseline to create an effective deficit or surplus for your goals.
Nutrition Planning
Use TDEE as the foundation for macronutrient calculations and meal planning.
Fitness Assessment
Adjust calorie intake based on changes in activity level or training phase.
Common Mistakes to Avoid
Overestimating activity level. Most people are less active than they think. When in doubt, choose one level lower.
Setting too aggressive a calorie deficit (more than 500-750 cal/day below TDEE), which can lead to muscle loss and metabolic adaptation.
Not recalculating as your weight changes. Lighter bodies need fewer calories.
Frequently Asked Questions
Accuracy and Disclaimer
MEDICAL DISCLAIMER: This calculator provides estimates for informational purposes only. Individual caloric needs vary based on genetics, medical conditions, medications, and other factors not captured here. Consult a registered dietitian or healthcare provider for personalized nutrition advice, especially if you have medical conditions.
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