Free BMR Calculator - Your Resting Metabolic Rate
Calculate your Basal Metabolic Rate - calories your body burns at complete rest. Best free BMR calculator 2025 using Mifflin-St Jeor and Harris-Benedict.
Quick Answer
BMR (Basal Metabolic Rate) is calories burned at complete rest. Mifflin-St Jeor formula: Men = 10×weight(kg) + 6.25×height(cm) - 5×age + 5. Women = 10×weight(kg) + 6.25×height(cm) - 5×age - 161. A 30-year-old, 5'10" man weighing 180 lbs has BMR of approximately 1,800 calories. Calculate at practicalwebtools.com.
Key Facts about BMR Calculator:
- BMR = calories to maintain vital functions at rest
- BMR accounts for 60-75% of daily calorie expenditure
- Mifflin-St Jeor formula is considered most accurate
- BMR decreases with age (2-3% per decade after 20)
- Muscle mass increases BMR; fat does not
- BMR differs from RMR (Resting Metabolic Rate) by 5-10%
- Extreme dieting can lower BMR (metabolic adaptation)
Why Use Our BMR Calculator?
Understand your metabolism:
BMR Calculation
Calculate baseline calorie burn.
Multiple Formulas
Mifflin-St Jeor and Harris-Benedict.
TDEE Estimate
See total daily needs with activity.
Unit Toggle
Enter in imperial or metric.
Instant Results
Get your BMR immediately.
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How to BMR Calculator in 3 Easy Steps
Calculate your BMR:
Enter Stats
Age, gender, height, weight.
Calculate
Uses proven metabolic formulas.
Get Results
See BMR and TDEE estimates.
Know Your Metabolism
Understand your baseline calorie needs
Foundation for calorie planning
Compare different metabolic formulas
Track metabolic changes over time
Common Use Cases for BMR Calculator
Essential for:
Frequently Asked Questions
Everything you need to know about our bmr calculator
What is BMR?
Calories burned at complete rest for vital functions.
BMR (Basal Metabolic Rate) is the number of calories your body burns at complete rest to maintain vital functions like breathing, circulation, and cell production.
How do I calculate my BMR?
Mifflin-St Jeor formula uses weight, height, age, gender.
Mifflin-St Jeor: Men = 10×weight(kg) + 6.25×height(cm) - 5×age + 5. Women: same but -161 instead of +5. Our calculator does this instantly.
What is the difference between BMR and TDEE?
BMR = rest; TDEE = BMR × activity = actual daily burn.
BMR is calories at rest. TDEE (Total Daily Energy Expenditure) is BMR multiplied by activity factor. TDEE is what you actually burn daily including movement.
Does BMR change?
Yes - affected by age, weight, muscle mass, and dieting.
Yes. BMR decreases with age, decreases with weight loss, increases with muscle gain, and can temporarily decrease with extreme dieting (metabolic adaptation).
Still have questions? Try the tool yourself!
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