BMR Calculator
Estimate your Basal Metabolic Rate (BMR) and daily caloric needs using the Mifflin-St Jeor formula.
How to Use the BMR Calculator
Enter the required values in the fields above and click Calculate. All calculations are executed directly inside your web browser using proven mathematical formulas, ensuring instantaneous results and 100% privacy without transmitting your numbers to remote servers.
Mathematical Formula
Worked Example
A 30-year-old male weighing 80 kg and 180 cm tall has a baseline BMR of ~1,780 calories/day.
Important Notes & Limitations
Actual metabolic rate varies based on genetics, lean body mass, hormone levels, and ambient temperature.
Want an in-depth walkthrough? Read our full guide on How to Calculate BMR and Daily Calorie Needs (TDEE Guide) → with complete step-by-step examples and formula breakdowns.
Calculations and classifications produced by HK Smart Tools are based on established clinical benchmarks (such as World Health Organization and Mifflin-St Jeor formulas) and are intended solely for general educational and informational reference. They do not constitute personalized medical advice, clinical diagnosis, or treatment plans. Body composition, muscle mass, age, and genetics affect individual results. Always consult a licensed healthcare professional for clinical decisions.
Frequently Asked Questions
Basal Metabolic Rate is the number of calories your body burns at complete rest to maintain vital functions like breathing, circulation, and cell production.