BMR Calculator
Calculate your Basal Metabolic Rate - the number of calories your body burns at rest
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About BMR
Basal Metabolic Rate (BMR) is the number of calories your body needs to perform basic life-sustaining functions like breathing, circulation, cell production, and brain function.
This calculator uses the Mifflin-St Jeor Equation, which is considered the most accurate BMR formula.
Your BMR accounts for approximately 60-75% of your total daily calorie expenditure. The remaining calories are burned through physical activity and digestion.
Note: BMR is an estimate. Individual metabolic rates can vary based on muscle mass, genetics, and other factors.
Your BMR
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Est. BMR
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How BMR (Basal Metabolic Rate) is Calculated?
Basal Metabolic Rate (BMR) represents the number of calories your body burns at rest to maintain basic physiological functions such as breathing, circulation, cell production, and brain function. It accounts for approximately 60-75% of your total daily calorie expenditure.
For Men:
BMR = (10 × W) + (6.25 × H) - (5 × A) + 5
For Women:
BMR = (10 × W) + (6.25 × H) - (5 × A) - 161
Where:
- W = Weight in kilograms
- H = Height in centimeters
- A = Age in years
Example:
Let's calculate BMR for a 30-year-old man who weighs 75 kg and is 175 cm tall.
Given: W = 75 kg, H = 175 cm, A = 30 years, Gender = Male
Step 1: Apply the Mifflin-St Jeor Equation for Men
BMR = (10 × W) + (6.25 × H) - (5 × A) + 5
BMR = (10 × 75) + (6.25 × 175) - (5 × 30) + 5
BMR = 750 + 1,093.75 - 150 + 5
BMR = 1,698.75 calories/day
Step 2: Calculate Weekly and Monthly Calories
Per Week = 1,698.75 × 7 = 11,891 calories
Per Month = 1,698.75 × 30 = 50,963 calories
Result: This person burns approximately 1,699 calories per day at rest, which is the minimum calories needed to maintain basic body functions.
This formula is considered the most accurate BMR calculation method and is widely used by healthcare professionals and nutritionists worldwide. It takes into account your gender, age, height, and weight to provide a personalized estimate of your metabolic rate.
Use Cases for BMR Calculator
Weight Management
Calculate your daily calorie needs for weight loss, maintenance, or gain goals
Fitness Planning
Determine optimal calorie intake for muscle building or athletic performance
Meal Planning
Plan daily meals and snacks based on your metabolic needs
Health Monitoring
Track metabolic changes over time as you age or change lifestyle
Medical Reference
Used by healthcare professionals for nutritional assessments
Diet Programs
Foundation for personalized diet plans and calorie counting
Benefits of Knowing Your BMR
Accurate Calorie Planning
Know exactly how many calories your body needs at rest, helping you plan meals more effectively.
Effective Weight Management
Create sustainable calorie deficits or surpluses based on your actual metabolic rate.
Prevent Metabolic Slowdown
Avoid eating too few calories, which can slow down your metabolism over time.
Optimize Nutrition
Ensure you're getting enough nutrients to support your body's basic functions.
Track Progress
Monitor changes in your BMR as you lose weight, gain muscle, or age.
Personalized Approach
Get calculations tailored to your specific age, gender, height, and weight.
BMR Calculator FAQs
❓What is BMR and why is it important?
BMR (Basal Metabolic Rate) is the number of calories your body burns at rest to maintain basic life functions. It's important because it forms the foundation for calculating your total daily calorie needs, which is essential for weight management and nutrition planning.
❓How accurate is the Mifflin-St Jeor equation?
The Mifflin-St Jeor equation is considered the most accurate BMR formula for the general population, with an accuracy rate of approximately 90%. It's widely used by healthcare professionals and is more accurate than older formulas like Harris-Benedict.
❓Does BMR change over time?
Yes, BMR changes with age (decreases as you get older), weight changes, muscle mass changes, and hormonal fluctuations. It's recommended to recalculate your BMR periodically, especially after significant weight changes.
❓What's the difference between BMR and TDEE?
BMR is the calories burned at rest, while TDEE (Total Daily Energy Expenditure) includes BMR plus calories burned through physical activity and digestion. TDEE is typically 1.2-1.9 times your BMR depending on activity level.
❓Can I use this calculator for weight loss?
Yes, knowing your BMR helps you create a calorie deficit for weight loss. Generally, a deficit of 500 calories per day leads to about 1 pound (0.45 kg) of weight loss per week. However, never eat below your BMR without medical supervision.
❓Is this BMR calculator free?
Yes, our BMR calculator is completely free to use with no registration required. You can use it as many times as needed to track changes in your metabolic rate.