BMR Calculator - Basal Metabolic Rate
Calculate your Basal Metabolic Rate (BMR) instantly. Our Free BMR Calculator uses advanced scientific formulas to estimate the exact number of calories your body burns at rest, processed privately on your device.
What is the BMR Calculator?
Your Basal Metabolic Rate (BMR) is the total number of calories your body requires to perform basic, life-sustaining functions (like breathing and circulation) while at rest. Understanding your BMR is the absolute foundation for any weight loss or muscle building journey. This calculator utilizes the highly accurate Mifflin-St Jeor equation to estimate your baseline metabolism based on your height, weight, age, and gender. Because we take health data privacy seriously, all mathematical processing occurs strictly within your browser, ensuring your physical metrics are never transmitted or saved.
Why Use Our BMR Calculator?
- Scientific Accuracy: Powered by the industry-standard Mifflin-St Jeor equation.
- Diet Planning Foundation: Know exactly how many calories you need to survive before adding exercise.
- Absolute Privacy: Health inputs are calculated locally and never leave your device.
- Instant Updates: See your BMR change in real-time as you adjust your weight or age.
How to Use the BMR Calculator
Select your biological gender.
Input your current age, weight, and height.
Click 'Calculate BMR'.
View your exact baseline calorie requirements for a 24-hour resting period.
Frequently Asked Questions
BMR is the calories you burn simply existing in bed all day. TDEE (Total Daily Energy Expenditure) multiplies your BMR by your physical activity level to give you your actual daily burn.
No, this calculator runs 100% locally. We do not have access to the data you type in.
Yes! Once you know your BMR, you can use our Calorie Calculator to factor in exercise and create a deficit or surplus.
All file processing is performed locally in your web browser. We do not upload, store, or view your data.