Calculate Your Basal Metabolic Rate
Discover how many calories your body burns at rest. Free, accurate BMR calculation using the Harris-Benedict equation.
Your Basal Metabolic Rate (BMR) is the number of calories your body needs to perform basic life-sustaining functions like breathing, circulation, and cell production while at complete rest. Understanding your BMR is the foundation of any successful weight management plan.
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Basal Metabolic Rate (BMR) represents the minimum number of calories your body requires to maintain vital functions such as:
BMR typically accounts for 60-75% of your total daily calorie expenditure, making it crucial for understanding your nutritional needs.
This calculator uses the revised Harris-Benedict equation, one of the most accurate BMR formulas:
For Men:
BMR = 88.362 + (13.397 × weight) + (4.799 × height) - (5.677 × age)
For Women:
BMR = 447.593 + (9.247 × weight) + (3.098 × height) - (4.330 × age)
Note: Weight in kg, height in cm, age in years.
Calories burned at complete rest - just staying alive with no activity.
Example: If your BMR is 1,500 calories, your body needs 1,500 calories daily just to maintain basic functions if you stayed in bed all day.
BMR + calories from all daily activities including exercise, walking, working, etc.
Example: If your BMR is 1,500 and you're moderately active, your TDEE might be 2,300 calories (BMR × 1.55).
Create a calorie deficit by eating 300-500 calories below your TDEE (not BMR).
Example:
BMR: 1,500 cal
TDEE: 2,300 cal (moderate activity)
Target: 1,800-2,000 cal/day
Eat at your TDEE level - matching energy in with energy out.
Example:
BMR: 1,500 cal
TDEE: 2,300 cal (moderate activity)
Target: 2,300 cal/day
Create a calorie surplus of 300-500 calories above TDEE, with strength training.
Example:
BMR: 1,500 cal
TDEE: 2,300 cal (moderate activity)
Target: 2,600-2,800 cal/day
Important: Never eat below your BMR for extended periods. This can slow your metabolism, cause muscle loss, and lead to nutritional deficiencies. Always calculate your TDEE and create deficits from that number.
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BMR (Basal Metabolic Rate) is the number of calories your body needs to perform basic life-sustaining functions at complete rest. It's important because it represents 60-75% of your total daily calorie expenditure and helps you understand your minimum caloric needs for weight management.
You can calculate BMR using the Harris-Benedict equation. For men: BMR = 88.362 + (13.397 × weight in kg) + (4.799 × height in cm) - (5.677 × age). For women: BMR = 447.593 + (9.247 × weight in kg) + (3.098 × height in cm) - (4.330 × age).
BMR is your calorie burn at complete rest, while TDEE (Total Daily Energy Expenditure) includes all activities. TDEE = BMR × activity factor. For sedentary lifestyle, multiply BMR by 1.2; for very active, multiply by 1.725.
Yes! Build muscle through strength training (muscle burns more calories than fat), stay hydrated, eat enough protein, get quality sleep, and avoid crash diets. Small frequent meals may also help maintain metabolic rate.
The Harris-Benedict equation used in this calculator has approximately 90% accuracy for most people. However, factors like muscle mass, genetics, and medical conditions can affect individual results. Use it as a starting point and adjust based on real-world results.
No, eating below your BMR is not recommended as it can slow metabolism, cause muscle loss, and lead to nutritional deficiencies. Instead, calculate your TDEE and create a 300-500 calorie deficit from that number for safe, sustainable weight loss.
Men typically have higher BMR because they have more muscle mass and less body fat percentage on average. Muscle tissue requires more energy to maintain than fat tissue, resulting in higher calorie burn at rest.
Yes, BMR typically decreases by about 1-2% per decade after age 20. This happens due to loss of muscle mass and hormonal changes. However, maintaining muscle through strength training can significantly slow this decline.
Several factors influence BMR including: body composition (muscle vs fat), age, gender, genetics, hormones (thyroid, cortisol), body temperature, medications, and overall health conditions. Stress and sleep quality also play a role.
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