BMR Calculator calculates your Basal Metabolic Rate using scientifically validated formulas to determine daily calorie needs for weight management.
What is Basal Metabolic Rate?
Basal Metabolic Rate (BMR) is the number of calories your body needs at rest to maintain basic physiological functions like breathing, circulation, and cell production.
BMR Calculation Formulas
Harris-Benedict Formula (1919)
- Men: BMR = 88.362 + (13.397 × weight in kg) + (4.799 × height in cm) – (5.677 × age in years)
- Women: BMR = 447.593 + (9.247 × weight in kg) + (3.098 × height in cm) – (4.330 × age in years)
Mifflin-St Jeor Formula (1990)
- Men: BMR = (10 × weight) + (6.25 × height) – (5 × age) + 5
- Women: BMR = (10 × weight) + (6.25 × height) – (5 × age) – 161
How to Use BMR Calculator
- Enter age, gender, weight, and height
- Select calculation formula
- Get BMR value
- Multiply by activity factor for TDEE
Activity Level Multipliers
| Activity Level | Multiplier | Description |
|---|---|---|
| Sedentary | 1.2 | Desk job, little exercise |
| Lightly Active | 1.375 | Light exercise 1-3 days/week |
| Moderately Active | 1.55 | Moderate exercise 3-5 days/week |
| Very Active | 1.725 | Hard exercise 6-7 days/week |
| Extremely Active | 1.9 | Physical job or 2x training |
Normal BMR Ranges
- Men: 1,400-2,000 calories/day
- Women: 1,200-1,800 calories/day
- Factors: Age, weight, height, muscle mass
BMR Calculator Applications
Essential for weight loss planning, nutrition counseling, fitness assessment, and metabolic health evaluation.
When to Use BMR Calculator
- Weight loss planning
- Dietary recommendations
- Fitness goal setting
- Metabolic assessment
Frequently Asked Questions
What is the difference between BMR and TDEE?
BMR is calories needed at rest, while TDEE (Total Daily Energy Expenditure) includes all daily activities. TDEE = BMR × activity factor.
How accurate are BMR calculators?
BMR formulas are approximately 90% accurate for most people. Individual variations exist based on genetics, body composition, and health status.
Can BMR change?
Yes, BMR decreases with age, increases with muscle mass, and can be affected by hormones, medications, and health conditions.
Conclusion
The BMR Calculator provides essential information for understanding daily calorie needs and creating effective weight management plans.