BMR Calculator
Calculate Basal Metabolic Rate using the validated Mifflin-St Jeor formula at rest.
Basal Metabolic Rate (BMR)
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How to Calculate Basal Metabolic Rate (BMR)
- Select biological sex, age in years, height, and current weight.
- The calculator applies the clinically validated Mifflin-St Jeor equation.
- View the baseline number of calories your body burns every 24 hours at absolute rest.
Mifflin-St Jeor Clinical Equation
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For Men:
BMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age in years) + 5 -
For Women:
BMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age in years) - 161
Clinical Example
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Male,
30 years old,80 kg,180 cm:BMR = (10 × 80) + (6.25 × 180) - (5 × 30) + 5 = 800 + 1125 - 150 + 5 = 1,780 kcal/day.
Common Applications
- Establishing a biological floor below which caloric intake should not drop.
- Building tailored weight loss or muscle building nutrition plans.
Limitations
- Does not include energy expended during physical movement, working, or digestion.
- Thyroid function and hormonal variations can alter resting metabolic rates.
Frequently Asked Questions
What is Basal Metabolic Rate?
BMR is the energy your body requires purely to maintain vital autonomic functions (breathing, cardiac circulation, cellular repair) while completely at rest.
Should I eat below my BMR to lose weight?
Consistently eating below your BMR is generally discouraged because it can trigger metabolic slowdown, nutritional deficiencies, and muscle loss.
Notice: BMR provides an empirical estimation of baseline resting caloric burn and does not substitute for clinical metabolic testing (indirect calorimetry).