BMR Calculator
Your Basal Metabolic Rate (BMR) is the amount of energy (in calories) your body requires to maintain fundamental life-sustaining functions—such as breathing, blood circulation, cell production, and body temperature maintenance—while at complete physical and digestive rest. Understanding your BMR vs TDEE is essential for structuring weight loss, muscle gain, or body recomposition goals.
How to Use the BMR Calculator
- Select your biological gender (Male or Female) to apply the correct metabolic offset equation.
- Input your current age, height (in cm or inches), and weight (in kg or lbs).
- Review your baseline Basal Metabolic Rate (BMR) - the exact calories your body burns sleeping or at rest.
- Factor in your weekly physical exercise level to convert your BMR into Total Daily Energy Expenditure (TDEE) for custom meal planning.
Formula & Calculation Methodology
Our mathematical algorithms adhere to standard scientific and financial guidelines to deliver maximum accuracy.
Frequently Asked Questions
What is the difference between BMR and TDEE?
BMR (Basal Metabolic Rate) represents the calories your body consumes purely to stay alive at 100% rest. TDEE (Total Daily Energy Expenditure) includes your BMR plus additional calories burned through daily movement, work, and exercise.
How do I use my BMR with exercise to lose or gain weight?
Multiply your BMR by an activity factor (1.2 for sedentary up to 1.9 for intense daily exercise) to get your TDEE. To lose weight safely, consume 300-500 calories below your TDEE. To gain muscle, eat 300-500 calories above your TDEE.
Why is the Mifflin-St Jeor equation used for BMR?
The Mifflin-St Jeor formula was developed in 1990 and is recommended by the Academy of Nutrition and Dietetics because research shows it is more accurate than older formulas like the Harris-Benedict equation.
Can I switch between Metric (kg/cm) and US units (lbs/in)?
Yes, our BMR calculator allows you to toggle seamlessly between US Imperial units (pounds, inches) and Metric units (kilograms, centimeters).
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