BMR Calculator - Free Basal Metabolic Rate Calculator
Calculate your Basal Metabolic Rate (BMR) using the Harris Benedict formula. Determine your resting metabolic rate and daily calorie needs with our free online BMR calculator.
What is Basal Metabolic Rate (BMR)?
Your Basal Metabolic Rate (BMR) is the minimum number of calories your body needs to maintain basic life functions while at complete rest. This online BMR calculator uses the scientifically-validated Harris Benedict formula and Mifflin St Jeor equation to compute your basal metabolic rate accurately.
Your BMR Powers Essential Body Functions:
- ✓Breathing
- ✓Blood circulation
- ✓Cell production
- ✓Nutrient processing
- ✓Brain function
- ✓Temperature regulation
💡 Key Insight
BMR typically accounts for 60-75% of your total daily calorie burn. The rest comes from activity and digesting food.
How to Calculate Your BMR
Our free BMR calculator uses your weight, height, age, and gender to determine your basal metabolic rate. The calculation is based on the widely-accepted Harris Benedict BMR formula:
BMR Formula for Men:
BMR = 10 × weight(kg) + 6.25 × height(cm) - 5 × age(years) + 5
BMR Formula for Women:
BMR = 10 × weight(kg) + 6.25 × height(cm) - 5 × age(years) - 161
BMR vs RMR: What's the Difference?
Basal Metabolic Rate (BMR) and Resting Metabolic Rate (RMR) are often used interchangeably. RMR is measured under less restrictive conditions than BMR, making it slightly higher (typically by 10-20%). Our BMR calculator provides both estimates for your resting metabolism.
How to Use Your BMR for Weight Loss
Understanding your basal metabolic rate is the first step in creating an effective weight loss plan. To lose weight, you need to consume fewer calories than your body burns. Use our BMR calculator for weight loss to:
- Calculate your baseline calorie needs
- Determine your Total Daily Energy Expenditure (TDEE) by factoring in activity level
- Set appropriate calorie deficit goals
- Track your metabolic rate as you lose weight
Factors That Affect Your Metabolic Rate
Age
BMR decreases by about 2% per decade after age 20
Gender
Men typically have 5-10% higher BMR than women
Body Composition
Muscle tissue burns more calories at rest than fat
Genetics
Some people naturally have faster or slower metabolism
Why Use Our Online BMR Calculator?
- ✓100% Free: No registration or payment required to calculate your BMR
- ✓Scientifically Accurate: Uses the Harris Benedict and Mifflin St Jeor formulas
- ✓Instant Results: Calculate your basal metabolic rate in seconds
- ✓Comprehensive: Get BMR, RMR, and TDEE calculations in one place