Underweight
BMI below 18.5
Being underweight may indicate nutritional deficiencies or underlying health conditions. Consider consulting a healthcare provider for personalized guidance.
Body Mass Index
Calculator
Enter your height and weight to instantly see your BMI and understand what it means for your health journey. Free, private, and no sign-up needed.
Understanding Your BMI
Body Mass Index is a widely used screening tool that estimates body fat based on height and weight. While it doesn’t measure body fat directly, it provides a useful starting point for conversations about weight and health.
Normal Weight
BMI 18.5 – 24.9
Your weight is within a healthy range for your height. Maintaining this through balanced nutrition and regular activity supports long-term well-being.
Overweight
BMI 25 – 29.9
Carrying extra weight can increase risk for certain conditions. Small lifestyle adjustments can make a meaningful difference over time.
Obese
BMI 30 and above
A higher BMI is associated with increased health risks. Professional support can help you explore evidence-based strategies that fit your life.
Why Use Our BMI Calculator?
Instant & Free
No accounts, no fees. Get your BMI in seconds anytime you need a quick health snapshot.
Private by Design
All calculations happen in your browser. Your height and weight never leave your device.
Metric & Imperial
Switch easily between centimeters/kilograms and inches/pounds to match your preference.
Clear Categories
Understand your result with easy-to-read weight categories and balanced health context.
A Note on BMI
BMI is a screening tool, not a diagnostic test. It does not distinguish between muscle, fat, and bone mass, and it may not accurately reflect body composition for athletes, older adults, pregnant individuals, or growing children. Always discuss your health concerns with a qualified healthcare professional who can consider your full medical history and lifestyle.
This calculator is intended for adults aged 20 and older. For children and teens, BMI is interpreted differently using age- and sex-specific percentiles.