BMI Calculator

Calculate your Body Mass Index (BMI) and understand your weight category. BMI is a screening tool that can indicate whether an adult is underweight, normal weight, overweight, or obese.

Calculate Your BMI

Enter your height and weight to calculate your BMI:

BMI = weight (kg) / [height (m)]Âē

What is BMI?

Body Mass Index (BMI) is a simple screening tool that can indicate whether an adult is at a healthy weight for their height. It's calculated by dividing weight in kilograms by height in meters squared.

BMI Categories (WHO Standards)

BMI Range Category Description Risk Level
Below 18.5 Underweight Below normal weight Increased risk
18.5 - 24.9 Normal Weight Healthy weight range Lowest risk
25.0 - 29.9 Overweight Above normal weight Increased risk
30.0 - 34.9 Obese Class I Moderately obese High risk
35.0 - 39.9 Obese Class II Severely obese Very high risk
40.0 and above Obese Class III Very severely obese Extremely high risk

BMI Limitations

🏃 Athletes

High muscle mass can result in high BMI without excess fat

ðŸ‘ī Elderly

Lower muscle mass can result in lower BMI despite adequate fat

🏗ïļ Body Composition

Doesn't distinguish between fat and muscle mass

ðŸ‘ķ Children

Different growth patterns affect BMI interpretation

Healthy BMI Ranges by Age

Age Group Healthy BMI Range Notes
19-24 years 19-24 Young adult range
25-34 years 20-25 Adult range
35-44 years 21-26 Middle age range
45-54 years 22-27 Middle age range
55-64 years 23-28 Older adult range
65+ years 24-29 Senior range

BMI and Health Risks

âĪïļ Heart Disease

Higher BMI increases cardiovascular risk

ðŸĐļ Diabetes

Obesity is a major risk factor for type 2 diabetes

ðŸĶī Joint Problems

Excess weight puts stress on joints

ðŸ˜ī Sleep Issues

Obesity can contribute to sleep apnea

ðŸ’Ą Important: BMI is a screening tool, not a diagnostic tool. Consult with a healthcare professional for personalized health advice and body composition assessment.

When to See a Doctor

  • BMI below 18.5 (underweight) - May indicate malnutrition or underlying health issues
  • BMI 25-29.9 (overweight) - Consider lifestyle changes to reduce health risks
  • BMI 30+ (obese) - Consult healthcare provider for comprehensive weight management plan
  • Any BMI with concerning symptoms - Always seek medical advice

BMI Calculator Features

  • 🔄 Multiple Units: Supports kg/lb for weight, cm/m/ft/in for height
  • 📊 WHO Categories: Uses World Health Organization BMI classifications
  • ⚡ Real-time Calculation: Updates instantly as you type
  • 🔒 Privacy: All calculations done in your browser, no data stored