About the BMR Calculator
The BMR Calculator is designed to give you a quick, practical estimate using the information you enter. Estimate resting energy expenditure with the Mifflin-St Jeor equation. The tool supports the unit choices shown in the calculator and presents the result in a format that is easy to compare with related weight-management measures.
Use the calculator by entering the requested values and selecting Calculate. The result card explains the main estimate and, where useful, shows supporting values that help you understand how the answer was derived. Select Reset to clear the form and start again.
This calculator is intended for general educational and planning purposes. It uses published equations or standard mathematical relationships, but individual needs and outcomes can vary. Treat the result as an estimate rather than a diagnosis, prescription, or guarantee.
Estimate resting energy expenditure with the Mifflin-St Jeor equation.
What Is Basal Metabolic Rate?
Basal Metabolic Rate (BMR) estimates energy used at rest to support essential functions such as breathing, circulation, temperature regulation, and cellular activity.
BMR is a starting point for estimating total daily energy needs; it does not include the full energy cost of daily activity.
Formula / Method Used
Mifflin-St Jeor: 10×weight(kg) + 6.25×height(cm) − 5×age + sex constant (+5 male, −161 female).
How to Use the BMR Calculator
- Choose the unit system or options requested by the tool.
- Enter the required measurements or planning values.
- Select Calculate to view your result and supporting details.
- Review the explanation and limitations before using the estimate for planning.
Example Calculation
A 40-year-old male at 80 kg and 175 cm has an estimated BMR around 1,680 kcal/day.
Limitations
Measured resting energy expenditure can differ because of body composition, genetics, health status, medications, and other factors.
Frequently Asked Questions
Is this calculator exact?
No. It provides an estimate based on the inputs and method shown on the page.
Can I use the result as medical advice?
No. The result is for general informational and educational use and does not replace individualized advice from a qualified healthcare professional.
Can I switch between Metric and US units?
Where measurements are required, the calculator supports the unit systems displayed in the form.
Methodology & References
Uses the Mifflin-St Jeor resting energy equation.