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Free Online BMI Calculator
Our Body Mass Index (BMI) Calculator is a simple, fast, and accurate tool designed to help you check your body weight relative to your height. Whether you use the metric or imperial system, you can instantly find out if you are underweight, normal weight, overweight, or obese.
What is BMI?
BMI is a widely used screening tool that estimates total body fat and assesses your risk for diseases related to increased body fat. While it does not measure body fat directly, it is a reliable indicator for most adults.
How BMI is Calculated
The BMI formula is simple and universal:
- Metric: BMI = weight (kg) / [height (m)]²
- Imperial: BMI = 703 × weight (lbs) / [height (in)]²
BMI Categories
- Underweight (Under 18.5): You may need to gain weight. Consider consulting a doctor or a dietitian.
- Normal Weight (18.5 – 24.9): You are at a healthy weight for your height. Maintain your healthy habits!
- Overweight (25.0 – 29.9): You are slightly over your ideal weight. A balanced diet and regular exercise can help.
- Obese (30.0 and above): You are in a higher health risk category. Please seek guidance from a healthcare provider.
Limitations of BMI
While BMI is a useful general guide, it has limitations. It does not distinguish between fat and muscle mass. Therefore, highly muscular individuals (like athletes) may have a high BMI but low body fat. It also does not account for age, bone mass, or fat distribution.
Privacy & Security
All calculations are performed entirely in your browser. No personal data, weight, or height measurements are sent to any server. Your inputs and selected unit preferences are only saved locally on your own device.