BMR Calculator
Basal Metabolic Rate

Your Basal Metabolic Rate (BMR) represents the number of calories your body burns at complete rest to maintain vital functions like breathing, circulation, and cell production. Understanding your BMR is crucial for effective weight management and fitness planning.

Discover your metabolic rate and optimize your health journey today

Calculate Your BMR
15 years100 years
30 kg300 kg
100 cm250 cm
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Adjust the sliders to calculate BMR

BMR Formulas

Mifflin-St Jeor (Recommended)

Men: BMR = 10 × weight(kg) + 6.25 × height(cm) - 5 × age + 5
Women: BMR = 10 × weight(kg) + 6.25 × height(cm) - 5 × age - 161

More accurate for modern lifestyles and body compositions

Harris-Benedict

Men: BMR = 88.362 + 13.397 × weight(kg) + 4.799 × height(cm) - 5.677 × age
Women: BMR = 447.593 + 9.247 × weight(kg) + 3.098 × height(cm) - 4.33 × age

Original formula, may overestimate for some individuals

What is BMR?

Basal Metabolic Rate (BMR) is the number of calories your body needs to perform basic physiological functions while at complete rest. These functions include breathing, circulation, cell production, nutrient processing, and protein synthesis.

Your BMR accounts for about 60-75% of your total daily energy expenditure, making it the largest component of your metabolism. Understanding your BMR helps you determine your daily caloric needs for weight maintenance, loss, or gain.

Factors Affecting BMR

  • Age (decreases with age)
  • Gender (men typically higher)
  • Body composition (muscle burns more)
  • Genetics
  • Hormones
  • Body temperature

How to Use BMR

  • Calculate daily calorie needs
  • Plan weight loss/gain strategies
  • Understand metabolic health
  • Set realistic fitness goals
  • Monitor metabolic changes
  • Optimize nutrition timing
Frequently Asked Questions

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