Body Mass Index (BMI) is a widely used metric that can help gauge whether your weight is healthy in proportion to your height. Understanding your BMI is a crucial first step in assessing your health risks. This guide will walk you through how to calculate it and what the result means.

What is BMI?

BMI is a simple calculation that uses your height and weight to produce a single number. This number is used to categorize you as underweight, normal weight, overweight, or obese. While it's not a perfect measure of body fat (as it doesn't distinguish between muscle and fat), it is a reliable and easy-to-use indicator for the general population.

How to Calculate BMI

You can calculate your BMI using either the metric or imperial system. The formulas are different for each.

Metric System (Kilograms & Meters)

The formula for BMI using the metric system is:

BMI = weight (kg) / [height (m)]²

For example, if you weigh 70 kg and are 1.75 meters tall, your BMI would be 70 / (1.75 * 1.75) = 22.9.

Imperial System (Pounds & Inches)

The formula for BMI using the imperial system is:

BMI = 703 * weight (lbs) / [height (in)]²

For example, if you weigh 150 lbs and are 65 inches tall, your BMI would be (703 * 150) / (65 * 65) ≈ 24.96.

Understanding Your BMI Result

Once you have your BMI number, you can use the standard categories to understand where you fall:

• Below 18.5: Underweight
• 18.5 – 24.9: Healthy Weight
• 25.0 – 29.9: Overweight
• 30.0 and Above: Obese

Why BMI Matters

While BMI has its limitations (for example, it may misclassify muscular athletes as overweight), it is a valuable screening tool. A high BMI is associated with an increased risk of several health problems, including:

• Type 2 diabetes
• Heart disease
• High blood pressure
• Certain types of cancer

Knowing your BMI can empower you to have a more informed conversation with your healthcare provider about your health and take proactive steps toward a healthier lifestyle.