BMI Calculator - Calculate Your Body Mass Index
Use our free BMI calculator to determine your Body Mass Index and understand your health category. Get instant results with detailed health insights and recommendations.
Free BMI Calculator - Check Your Body Mass Index Online
Calculate your Body Mass Index (BMI) quickly and accurately with our free online BMI calculator. BMI is a widely used screening tool that helps assess whether you're at a healthy weight for your height. Our calculator supports both metric (kg/cm) and imperial (lbs/ft-in) measurements, providing instant results with detailed health category classifications.
Understanding your BMI is crucial for maintaining good health and identifying potential weight-related health risks. Whether you're tracking your fitness journey, consulting with healthcare providers, or simply curious about your health status, our BMI calculator provides accurate, instant results you can trust.
Calculate Your BMI Now
Medical Disclaimer: This BMI calculator provides an estimate and should not be considered medical advice. BMI has limitations and may not be accurate for all individuals. Always consult with healthcare professionals for proper health assessments and medical guidance.
Comprehensive BMI Chart and Classification
This BMI chart shows the standard weight classifications according to the World Health Organization (WHO) guidelines. Use this reference to understand where your BMI falls and associated health risks.
| BMI Range | Weight Classification | Health Risk Assessment |
|---|---|---|
| Below 18.5 | Underweight | Increased risk of nutritional deficiency, osteoporosis, and immune system problems |
| 18.5 - 24.9 | Normal Weight (Healthy) | Lowest risk of weight-related health problems and chronic diseases |
| 25.0 - 29.9 | Overweight | Increased risk of heart disease, high blood pressure, stroke, and type 2 diabetes |
| 30.0 - 34.9 | Obesity Class I (Moderate) | High risk of cardiovascular disease, diabetes, and metabolic syndrome |
| 35.0 - 39.9 | Obesity Class II (Severe) | Very high risk of serious health complications and reduced life expectancy |
| 40.0 and above | Obesity Class III (Morbid) | Extremely high risk of severe health problems requiring immediate medical attention |
How to Calculate BMI: Step-by-Step Guide
Manual BMI Calculation (Metric)
Step 1: Measure Your Height
Measure your height in centimeters or convert to meters (e.g., 170 cm = 1.70 m)
Step 2: Measure Your Weight
Weigh yourself in kilograms (e.g., 70 kg)
Step 3: Apply the Formula
BMI = weight(kg) ÷ height²(m²)
Example: 70 ÷ (1.70)² = 24.2
Manual BMI Calculation (Imperial)
Step 1: Measure Your Height
Measure your height in inches (e.g., 5'7" = 67 inches)
Step 2: Measure Your Weight
Weigh yourself in pounds (e.g., 154 lbs)
Step 3: Apply the Formula
BMI = (weight(lbs) × 703) ÷ height²(in²)
Example: (154 × 703) ÷ (67)² = 24.1
Evidence-Based Tips for Maintaining a Healthy Weight
Achieving and maintaining a healthy BMI involves a combination of balanced nutrition, regular physical activity, and lifestyle modifications. Here are science-backed strategies recommended by health professionals:
Regular Physical Activity
Aim for at least 150 minutes of moderate aerobic activity or 75 minutes of vigorous activity per week, plus muscle-strengthening activities on 2+ days per week.
Balanced Nutrition
Focus on nutrient-dense foods: fruits, vegetables, whole grains, lean proteins, and healthy fats. Limit processed foods, sugary beverages, and excessive alcohol consumption.
Portion Control
Practice mindful eating with appropriate portion sizes. Use smaller plates, read nutrition labels, and avoid eating directly from packages to manage caloric intake.
Regular Health Monitoring
Track your weight, BMI, and other health metrics regularly. Consistent monitoring helps identify changes early for timely lifestyle adjustments and medical consultations.