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Calorie Calculator: Complete Guide to BMR & TDEE

Calories represent the energy your body uses to function, and understanding your daily calorie needs is essential for weight management, fitness progress, and long-term health. Whether you want to lose fat, build muscle, maintain your weight, or improve athletic performance, knowing your BMR and TDEE is the foundation of any successful health plan.

Our Calorie Calculator uses the Mifflin-St Jeor Equation, the most accurate and widely used formula in nutrition science, trusted by hospitals, gyms, and nutritionists worldwide.

What Is BMR?

Basal Metabolic Rate (BMR) is the number of calories your body burns at rest to maintain basic life functions, including breathing, blood circulation, cell production, nutrient processing, and organ function. BMR makes up 60–75% of your total daily calorie burn and decreases with age.

What Is TDEE?

Total Daily Energy Expenditure (TDEE) is the total number of calories you burn in a day, including exercise, daily movement, and basic bodily functions. TDEE is calculated by multiplying your BMR by your activity level multiplier.

How Calorie Balance Works

• Maintenance: Calories eaten = TDEE → weight remains stable
• Fat Loss: Calories eaten < TDEE → body uses stored fat for energy
• Muscle Gain: Calories eaten > TDEE → body uses extra energy to build muscle

Activity Levels Fully Explained

• Sedentary: Little to no exercise, desk job, minimal walking
• Light Activity: Light exercise or walking 1–3 days per week
• Moderate Activity: Moderate exercise 3–5 days per week
• Active: Hard exercise or physical labor 6–7 days per week
• Very Active: Very intense daily exercise + physically demanding job

Calorie Goals Explained

• Maintain Weight: Eat exactly your TDEE calories
• Mild Fat Loss: TDEE – 300 calories (safe, sustainable)
• Fast Fat Loss: TDEE – 500 calories (loses ~0.5kg per week)
• Muscle Gain: TDEE + 250 calories (clean bulking)

The Science of Fat Loss

One kilogram of body fat contains approximately 7700 calories. This means a daily calorie deficit of 500 calories will result in roughly 0.5kg of fat loss per week — the medically recommended rate for healthy, sustainable weight loss.

Who Can Benefit From This Calculator?

• People who want to lose weight safely and permanently
• Bodybuilders and fitness enthusiasts building muscle
• Anyone trying to maintain a healthy lifestyle
• Athletes improving energy and performance
• Nutritionists, trainers, and health coaches

How to Use This Calorie Calculator

1. Enter your age, gender, weight, and height
2. Select your daily activity level
3. Choose your fitness goal (maintain, lose, gain)
4. View your BMR, TDEE, and daily calorie target
5. Enter your goal weight to see your timeline
6. Follow your personalized calorie plan for results

Scientific Formulas Used

Male BMR: 88.362 + (13.397 × weight in kg) + (4.799 × height in cm) − (5.677 × age in years)

Female BMR: 447.593 + (9.247 × weight in kg) + (3.098 × height in cm) − (4.330 × age in years)

TDEE: BMR × Activity Multiplier

Important Health & Fitness Tips

• Recalculate your calories every 4–6 weeks as your weight changes
• Consume enough protein to preserve muscle during weight loss
• Drink at least 2 liters of water daily
• Sleep 7–9 hours per night for hormone balance
• Combine calorie management with strength training
• Be consistent — sustainable habits beat quick fixes

Final Notes

This calculator provides a highly accurate scientific estimate. Individual results may vary slightly due to genetics, hormones, stress, sleep quality, and medical conditions. Use this tool as a reliable foundation for your health and fitness journey.

Calorie management is not about deprivation — it’s about using science to reach your goals safely, efficiently, and permanently.