BMI Calculator

How to Calculate Body Mass Index (BMI)

Body Mass Index (BMI) is a simple measure that uses your height and weight to work out if your weight is healthy. Understanding how to calculate BMI can help you assess your body weight in relation to your height.

BMI Formula

The formula used to calculate BMI is:

$$BMI = \frac{\text{weight (kg)}}{(\text{height (m)})^2}$$

Where:

• BMI is Body Mass Index
• Weight is measured in kilograms (kg)
• Height is measured in meters (m)

Calculation Steps

1. Measure your weight in kilograms
2. Measure your height in meters
3. Square your height
4. Divide your weight by your squared height
5. The result is your BMI

Example Calculation

Let's calculate the BMI for a person who weighs 70 kg and is 1.75 m tall:

Step 1: Apply the formula

$$\begin{align} BMI &= \frac{70}{(1.75)^2} \end{align}$$

Step 2: Calculate

$$\begin{align} BMI &= \frac{70}{3.0625} \\ &= 22.86 \end{align}$$

Step 3: Final result

The calculated BMI is 22.86, which falls within the "Normal weight" category.

Visual Representation

This bar chart illustrates the calculated BMI (22.86) in comparison to the standard BMI categories: Underweight (<18.5), Normal (18.5-24.9), Overweight (25-29.9), and Obese (≥30).