Free online BMI calculator | kg and cm + lb and ft/in

We all want to maintain a healthy weight, but sometimes it can be difficult to know what our ideal weight should be. That's where our online BMI (body mass index) calculator comes. This simple tool uses your height and weight to give you an estimation of whether you are underweight, overweight, obese, or have a healthy weight.

Body Mass Index Calculator (METRIC)


Your BMI is:

Body Mass Index Calculator (IMPERIAL)


Your BMI is:

How does our Online BMI calculator work?

To use our Online BMI Calculator, follow the steps below:

~ Step 1 ~

Enter your height in either metric units (centimetres) or imperial units (feet/inches)

~ Step 2 ~

Next, enter your weight in either metric units (kilograms) or imperial units (pounds)

~ Step 3 ~

Once you have inputted this information, click on the "Calculate BMI" button. Your BMI will be displayed in both metric and imperial units
online bmi calculator

What is BMI?

BMI, or Body Mass Index, is a calculation that allows health professionals to estimate how much body fat you have about your height. BMI does not measure body fat directly, but it is a useful tool to estimate whether you are carrying too much weight for your height.

BMI Categories

Underweight <18.5
Normal Weight 18.5-24.9
Overweight 25-29.9
Obese 30-39.9
Morbidly Obese >40

Why is BMI important?

Maintaining a healthy weight is important for overall health and can help reduce your risk for conditions such as heart disease, high blood pressure, type 2 diabetes or unhealthy cholesterol.

What are the limitations of BMI?

BMI is not a perfect measure, as it does not directly measure body fat. It is also important to remember that BMI varies depending on age and sex. For example, boys and girls have different BMIs at the same age, and adults have different BMIs at different ages.

BMI calculation

The BMI calculator uses the following formula:

~ Example of calculation: ~

BMI = weight (kg) / height2 (m2)
For example, if you weigh 72 kg and your height is 1.8 m, your BMI would be calculated as follows:
BMI =72 / (1.8 x 1.8) = 23.1
This BMI would be considered healthy.

What is a healthy BMI?

The answer to this question depends on your age and sex. For adults 20 years and older, a BMI of 18.5 to 24.9 is considered healthy. For women who are pregnant or breastfeeding, a BMI of 18.5 to 29.9 is considered healthy. For children and teens aged 2 to 19 years, a healthy BMI depends on their age and sex.

What is BMI used for?

BMI is used as a screening tool to identify possible weight problems for children and adults. However, BMI is not perfect. It does not directly measure body fat and it may overestimate or underestimate body fat in people who are very muscular or have a lot of bone mass. That's why health professionals also consider factors such as waist circumference and body fat percentage when assessing someone's risk of developing obesity-related health problems.

Why should we use online BMI calculator?

There are many reasons why you might want to use an Online BMI Calculator.

  • Maybe you're trying to lose weight and you want to know if you're on track. Or maybe you're curious about whether your weight is healthy.
  • Whatever the reason, our Online BMI Calculator is a quick and easy way to get an estimate of your BMI.
  • Remember, BMI is just one tool to help you assess your weight. It's not a perfect measure, but it's a good starting point for starting a conversation with your health care provider about your weight.

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