Health Guide
How to Calculate BMI & Understand Results
Published on July 21, 2026 • 5 min read
Body Mass Index, or BMI, is a quick and widely used medical screening tool to check if a person has a healthy ratio of weight to height. While it doesn't measure body fat percentage directly, it correlates strongly with metabolic health risks.
📐 The Mathematical Formula for BMI
Calculating your BMI is straightforward. The formula differs depending on whether you use the metric system or the imperial system:
Metric System (Standard):
BMI = Weight (kg) / [Height (m)]²
Imperial System (US Standard):
BMI = [Weight (lbs) / (Height (in))²] × 703
📊 Understanding BMI Classifications
According to the World Health Organization (WHO), adults over 20 years old are grouped into the following categories based on their BMI score:
| BMI Range | Classification | Health Risk Level |
|---|---|---|
| Below 18.5 | Underweight | Moderate Risk |
| 18.5 – 24.9 | Normal Weight | Minimal Risk (Healthy) |
| 25.0 – 29.9 | Overweight | Increased Risk |
| 30.0 and Above | Obesity | High Clinical Risk |
💡 Tips to Maintain a Healthy BMI
- Eat a Balanced Diet: Focus on whole foods, vegetables, fruits, lean proteins, and complex carbohydrates. Limit processed sugars.
- Stay Physically Active: Aim for at least 150 minutes of moderate aerobic exercises (like brisk walking or cycling) every week.
- Track Your Metrics: Consistently monitor your progress using online tools to keep tabs on weight changes.
Want to check your own BMI score instantly?
⚖️ Run BMI Calculator