BMI Calculator – Understand Your Body Mass Index Easily

Body Mass Index (BMI) is a simple number used worldwide to check if a person’s weight is healthy compared to their height. It helps you know if you are underweight, normal weight, overweight, or obese.

BMI is an easy way to get a quick idea about your weight health, but it does not show everything about fitness or body fat. It is important to understand how it works.

What is BMI?

BMI is a number calculated using your weight and height. It is the same for both men and women, and is generally used for adults aged 18 to 65 years.

Since the calculator here takes height in centimetres, the formula you should use is:

BMI = (Weight in kilograms) ÷ (Height in centimetres ÷ 100)²

Example:

  • Weight = 70 kg
  • Height = 175 cm

Steps:

  • First, convert height into metres: 175 ÷ 100 = 1.75 metres
  • Then square the height: 1.75 × 1.75 = 3.0625
  • Now divide the weight by the squared height: 70 ÷ 3.0625 = 22.86

So, the BMI will be 22.86, which falls into the "Normal weight" category.

BMI Categories

According to the World Health Organization (WHO), BMI falls into these groups:

BMI RangeCategoryBelow 18.5Underweight18.5 – 24.9Normal weight25 – 29.9Overweight30 and aboveObesity

These categories give you a general idea about your weight health.

Why is BMI Important?

  • Simple Health Check: BMI gives a quick idea of whether your weight is in a healthy range.
  • Health Risk Awareness: Being overweight or underweight can increase the chances of health issues like diabetes, heart disease, and blood pressure problems.
  • Easy to Calculate: You only need your weight in kilograms and height in centimetres to find your BMI.

However, BMI does not tell everything. For example, muscular people or athletes may have a higher BMI without being unhealthy. Other factors like body fat percentage, waist size, and general fitness are also important.

How to Use Our BMI Calculator

Using our free BMI Calculator is very easy:

  • Enter your weight in kilograms (kg).
  • Enter your height in centimetres (cm).
  • Click the "Calculate" button.
  • You will see your BMI number along with the category it falls into.

This helps you get a quick view of your body weight status.

Final Thoughts

BMI is a simple tool to understand if your weight is healthy for your height. It is easy, quick, and used all around the world. But remember, your health depends on many things, not just BMI. Stay active, eat healthy, and visit a doctor if you need a full health check-up.

You can use our online BMI Calculator anytime to check your BMI quickly and easily!



Published on May 04, 2025
Category: Health & Fitness