Body Mass Index (BMI) is one of the most widely used tools by doctors and health professionals around the world to quickly assess whether a person is at a healthy weight.
But what exactly do those numbers mean?
In this guide, we will break down what a healthy BMI range looks like, how the calculation works, and how you can figure out your own number right now using our **Free BMI Calculator**.
What is BMI?
Body Mass Index (BMI) is a simple numerical value based on two things: your height and your weight.
It was designed as a quick, inexpensive screening tool to identify possible weight problems for adults. While it does not measure body fat directly, research shows that BMI strongly correlates with more direct measures of body fat.
The Standard BMI Categories
The World Health Organization (WHO) and most medical institutions use the following standard weight status categories associated with BMI ranges for adults:
1. Underweight (BMI less than 18.5)
A BMI below 18.5 indicates that you may be underweight. Being underweight can pose health risks, including a weakened immune system, fragile bones, and feeling constantly tired. If your BMI falls in this range, a healthcare provider might recommend dietary changes to help you safely gain weight.
2. Healthy Weight (BMI 18.5 to 24.9)
This is considered the healthy or "normal" weight range. Statistically, individuals in this range have the lowest risk of weight-related health conditions, such as heart disease, high blood pressure, and type 2 diabetes.
3. Overweight (BMI 25.0 to 29.9)
A BMI in this range suggests that you are overweight. Risk factors for chronic diseases begin to increase in this category. For many people, adopting healthier eating habits and increasing physical activity can help bring their BMI back into the healthy range.