BMR Calculator - Basal Metabolic Rate Calculator
Free online BMR calculator to calculate your basal metabolic rate. Determine your daily calorie needs at rest with accurate BMR formulas.
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About BMR Calculator
The BMR Calculator helps you determine your Basal Metabolic Rate - the number of calories your body needs to maintain basic physiological functions at rest.
Formulas Used:
- Mifflin-St Jeor (2005): Most accurate and widely used equation
- Harris-Benedict (1919): Original equation, still referenced in many contexts
- Katch-McArdle: Based on lean body mass, requires body fat percentage
Factors Affecting BMR:
- Age: BMR decreases with age
- Gender: Men typically have higher BMR
- Weight: Higher weight = higher BMR
- Height: Taller people have higher BMR
- Muscle Mass: More muscle = higher BMR
- Genetics: Some people naturally have faster/slower metabolism
Using Your BMR:
- Multiply by activity factor to get total daily calorie needs
- Use as baseline for weight loss/gain calculations
- Track changes over time to monitor metabolism
Note: BMR calculations are estimates. Individual metabolism can vary significantly. For precise measurements, consider professional metabolic testing.
Frequently Asked Questions
What is BMR?
BMR (Basal Metabolic Rate) is the number of calories your body burns at rest to maintain basic physiological functions like breathing, circulation, and cell production.
Which BMR formula is most accurate?
The Mifflin-St Jeor equation is considered the most accurate and widely used BMR formula, especially for modern populations.
How is BMR different from TDEE?
BMR is calories burned at rest, while TDEE (Total Daily Energy Expenditure) includes calories burned through physical activity and daily tasks.
Can I use BMR for weight loss?
Yes, BMR helps determine your baseline calorie needs. For weight loss, you typically need to consume fewer calories than your TDEE (BMR + activity).
Why do men have higher BMR than women?
Men generally have more muscle mass and less body fat than women, and muscle tissue burns more calories at rest than fat tissue.