BMI Calculator
Calculate Body Mass Index (BMI) in metric or imperial units and determine your healthy weight range.
How to Use the BMI 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 person weighing 70 kg at a height of 175 cm has a BMI of 22.9, categorized as Normal Weight.
Important Notes & Limitations
BMI is a statistical screening metric. It does not measure body fat percentage directly and does not distinguish muscle mass from fat mass in athletes or elderly individuals.
Want an in-depth walkthrough? Read our full guide on How to Calculate BMI and What It Means → 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
Underweight (< 18.5), Normal weight (18.5–24.9), Overweight (25.0–29.9), and Obesity (30.0 or higher).