BMI (Body mass index) Calculator

In this BMI calculator, you can quickly assess your body mass index, a measure of your body's weight relative to your height. Simply enter your gender, age, weight and height to calculate your BMI and check weather you are within a healthy weight range for your height.

Body Mass Index (BMI)

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Your BMI is






18.5 - 24.9



25 - 29.9



30 - 34.9








What is Body Mass Index (BMI) ?

BMI, which stands for Body Mass Index, is a number calculated from a person's weight and height. BMI provides a reliable indicator of body fat for most people and is used to screen for weight categories that could potentially impact health, including fertility issues.

How to Calculate BMI? (BMI calculator online / BMI calculator Malaysia)

Check your BMI quickly using our Body Mass Index calculator. Find out if you are underweight, normal, obese or overweight. Body Mass Index (BMI) is an indication of the amount of fat in a person's body based on the ratio of body weight compared to a person's height. There's another, more precise way to estimate body fat that's both simpler and more accurate than BMI. It's called Relative Fat Mass (RFM). The Body Mass Index (BMI) value tells whether a person is thin/underweight, normal/ideal weight, obese/overweight. 

Body Mass Index (BMI) is an indication of the amount of fat in a person's body based on the ratio of body weight compared to a person's height. It is a widely used tool to determine a person's optimal body weight and can provide insights into the relationship between obesity and immune system health. The higher the BMI, the greater the level of fat in a person's body, which can impact the functioning of the immune system. Due to its simplicity in calculation, BMI is commonly utilized as a tool to determine a person's optimal body weight.

Is there any easy way to calculate Body Mass Index (BMI)?

With the Online BMI calculator and interactive below, you don't need to make calculations to get Body Mass Index (BMI).

You just need to:

Enter your Gender, Age, Weight, Height in the boxes provided.

Press the Calculate button.

Your BMI value and its classification will be automatically displayed in the Body Mass Index (BMI) Results column.

What are the different BMI categories?

BMI, or Body Mass Index, is typically divided into four categories that help to classify an individual's weight in relation to their height. The BMI categories are as follows:

Underweight: A BMI below 18.5 is considered underweight. This category indicates that a person's weight is lower than what is considered healthy for their height. Being underweight can be associated with health risks, such as nutritional deficiencies and a weakened immune system.

Normal Weight (ideal/superior weight): A BMI between 18.5 and 24.9 falls within the normal weight range. Individuals in this category typically have a weight that is considered healthy for their height. It suggests that they are at a lower risk of certain weight-related health issues.

Overweight: A BMI between 25.0 and 29.9 falls into the overweight category. This indicates that a person's weight is higher than what is considered healthy for their height. Overweight individuals may be at an increased risk of health problems like heart disease, diabetes, and joint issues.

Obese (Obesity): A BMI of 30.0 or higher is classified as obesity. This category signifies that a person has a significantly higher body weight relative to their height, and it is associated with a greater risk of serious health conditions, including type 2 diabetes, heart disease, hypertension, and cancers. Mainly, lack of sleep causes obesity by disrupting the body's hormonal balance and increasing cravings for high-calorie foods. So, it is important to address sleep quality and duration as a crucial factor in managing and preventing obesity, highlighting the interconnectedness of lifestyle choices and overall health.

BMI Classification Chart

BMI RangeCategory
Under 18.5Underweight
18.5 - 24.9Normal (ideal/superior weight)
25.0 - 29.9Overweight
30.0 and aboveObese (Obesity)

How do I calculate my BMI using the formula?

To calculate Body Mass Index (BMI) manually, use the following formula:

Metric System

Body Mass Index = Wt (in kilograms) / [Ht (in meters)]2

Imperial System

Body Mass Index = Wt (in pounds) / [Ht (in inches)]2 x 703

Note: The BMI calculation mentioned above is appropriate for evaluating adult men and women aged 18 to 64. It's not recommended for use by children, infants, pregnant or breastfeeding women, individuals with high muscle mass (like athletes or bodybuilders), and older adults who may have experienced muscle loss.

What is the Accuracy of BMI Calculator?

BMI takes into consideration your height and weight to categorize you into a weight range. However, the BMI calculator is unable to differentiate between fat and muscle. If you have a significant amount of muscle, which is denser than fat, you might find yourself classified as overweight or obese based on your BMI result. The BMI calculator is also unable to determine if you’re pregnant, so it's advisable to check in with your doctor or healthcare professionals if you have any concerns about your weight.

Additionally, childhood obesity, which is a growing concern worldwide, can also be inaccurately assessed using the BMI calculator, as it does not account for factors such as body composition and the unique growth patterns of children.

  1. Centers for Disease Control And Prevention - CDC
  2. Diabetes Canada - Body Mass Index (BMI) Calculator.
  3. National Center for Biotechnology Information - Relationship of Ethnicity and Body Mass Index with the Development of Hypertension and Hyperlipidemia
  4. Statista Research Department - Prevalence of obesity in the ASEAN region in 2019, by country
  5. Forbes - BMI Chart For Men And Women: Your Guide To This Common Health Metric
  6. Body mass Index

Frequently Asked Questions

Using health calculators is important because they provide valuable insights into your well-being. They help you understand your current health status, which can be the first step toward improving it.

The frequency of using health calculators can vary, but regular check-ins, such as monthly or quarterly, can help you track your progress and stay motivated on your health journey.

While health calculators are useful tools, they should not replace medical advice. Always consult with a healthcare professional for accurate and personalized guidance, especially if you have specific health conditions.

Health calculator results are generally accurate based on the information you provide. Interpretation often comes with recommended ranges, but for a detailed analysis, consult with a healthcare provider.

GoodHealthByYourself's calculators are user-friendly, scientifically validated, and designed with your well-being in mind. We are dedicated to help you achieve your fitness and health goals. Our calculators provide accurate results and actionable advice, empowering you to make the most of your health data. A healthier you begins with understanding where you are now, and our tools are here to support you on that journey.

Yes, most health calculators are designed to be relevant for individuals of all age groups. However, it's a good idea to consult with a healthcare professional for personalized advice.

To use health calculators effectively, ensure you input accurate data, revisit them regularly, and use the results to make informed decisions about your health and fitness.

Health calculators provide data-driven insights into various aspects of your health. They can help you gain a better understanding of your body's composition, metabolism, and overall well-being.