BMI Calculator
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About Body Mass Index (BMI)
Body Mass Index (BMI) is a simple index of weight-for-height that is commonly used to classify underweight, overweight and obesity in adults. It is defined as the weight in kilograms divided by the square of the height in metres (kg/m²).
BMI Categories & Healthy Weight
For most adults, an ideal BMI is in the 18.5 to 24.9 range. Below is the full classification based on WHO standards:
| Category | BMI Range (kg/m²) |
|---|---|
| Underweight | < 18.5 |
| Normal Weight | 18.5 – 24.9 |
| Overweight | 25.0 – 29.9 |
| Obese Class I | 30.0 – 34.9 |
| Obese Class II | 35.0 – 39.9 |
| Obese Class III | > 40.0 |
Why Monitoring Your BMI is Important
🌱 Health Screening
Maintaining a healthy BMI can reduce the risk of serious health conditions like heart disease, type 2 diabetes, and certain cancers.
💪 Understanding Body Composition
BMI is a general screening tool. It's important to remember it doesn't distinguish between muscle mass and body fat.
🍎 Balanced Weight Management
Focus on nutrient-dense foods and regular physical activity to maintain a BMI within the healthy range.
BMI Frequently Asked Questions
Is BMI accurate for everyone?
BMI is a general guide. It may not be accurate for athletes or older adults because it doesn't account for muscle mass vs. fat.
What is a "Normal" BMI?
For most adults, a healthy BMI is between 18.5 and 24.9.
How can I lower my BMI?
Consistency is key! Combine regular physical activity with a balanced, calorie-controlled diet for sustainable weight management.
This Professional BMI Calculator is designed to provide quick, accurate results for your health monitoring needs. All processing happens locally in your browser for maximum privacy.