BMI Calculator

BMI Calculator
Use this calculator to check your body mass index (BMI).
Height
cm.
Please enter value between 125 and 225.
Weight
kg.
Please enter value between 10.0 and 500.0 ( one decimal ).
Calculate BMI
Use this calculator to check your body mass index (BMI), which can be a helpful tool in determining your weight category. Or, use it to calculate your child’s BMI.

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Understanding your body mass index (BMI) is key to staying healthy and knowing your ideal weight range. Knowing your BMI is an important part of assessing and monitoring the state of your health. Armed with this knowledge, you can make more informed decisions about how to improve your overall well-being.

Whether it’s through exercise, dieting, or other lifestyle changes—knowing your BMI will help ensure that you take the right steps for a healthier future. Calculate your BMI using our BMI Calculator and use it as a powerful tool in guiding positive change in your life!

What is BMI?

Body mass index (BMI) is a measure of body fat based on height and weight that applies to both adult men and women.

BMI is calculated by dividing your weight in kilograms (kg) by your height in meters (m). BMI values are generally expressed in kg/m2.

A high BMI can be an indicator of high body fatness. BMI is not a direct measure of body fatness, however, and some people, such as athletes, may have a high BMI but not have high body fatness.

To calculate your BMI, use the following formula:

BMI = Weight (kg) / Height2 (m2) or use our free BMI calculator.

If your BMI is:

  • Below 18.5 – you are considered underweight
  • 18.5 to 24.9 – you are considered a healthy weight Above 25 – you are considered overweight

How to Calculate Your BMI

Your BMI, or body mass index, is a measure of your body fat based on your height and weight. To calculate your BMI, you can use a BMI calculator or you can do the math yourself.

To calculate your BMI manually, start by converting your height into meters. For example, if you’re 5 feet 9 inches tall, that’s 1.75 meters. Once you have your height in meters, square it. So 1.75 squared is 3.0625.

Then, multiply your weight in kilograms by itself. For example, if you weigh 68 kilograms, that’s 68 x 68 = 4661.

Finally, divide your weight kg by your height m squared. In our example, that would be 4661 ÷ 3.0625 = 1516.863715277778

Your BMI is 1516.863715277778 kg/m2

Now that you know how to calculate your BMI, what does your number mean? A healthy BMI falls between 18.5 and 24.9 kg/m2. If yours is below 18.5 kg/m2 , you may be considered underweight; if it’s above 24.9 kg/m2 , you may be considered overweight; and if it’s 30 or higher kg/m2 , you may be considered obese

Factors Influencing BMI

There are several factors that can influence a person’s BMI, including height, weight, age, gender, and muscle mass. While BMI is a helpful tool for assessing someone’s general health, it is not a perfect measure and other factors should be considered when determining whether someone is at a healthy weight.

Height: A person’s height can affect their BMI in two ways. First, taller people will generally have a higher BMI than shorter people of the same weight because they have more body mass. Second, taller people may have a higher BMI because they often have more muscle mass than shorter people.

Weight: Obviously, weight is the biggest factor influencing BMI. Heavier people will have a higher BMI than lighter people of the same height. However, it’s important to remember that muscle mass also contributes to weight and so someone who is very muscular may have a high BMI even if they are not overweight.

Age: Age can also affect BMI because as we get older we tend to lose muscle mass and our bodies become less efficient at burning calories. This means that an older person of the same weight and height as a younger person may have a higher BMI.

Gender: Men and women tend to carry different amounts of body fat and muscle mass, which can influence their BMIs. In general, men have more muscle mass than women and women tend to carry more body fat. This means that men tend to have lower BMIs than women of the same height and weight.

Normal Ranges of BMI

Body mass index (BMI) is a measure of body fat based on height and weight that applies to both adult men and women. BMI is an estimate of body fat and is used as a screening tool to identify possible weight-related health problems.

While BMI can be used as a general guideline, it does have some limitations. For example, it does not directly measure body fat, and it may overestimate body fat in people who are very muscular or who have a lot of bone mass. In addition, BMI does not consider whether the weight is carried as muscle or fat, just the total amount.

A healthy BMI for adults falls between 18.5 and 24.9. People with BMIs below 18.5 are considered underweight, while those with BMIs above 24.9 are considered overweight or obese. BMI is just one part of the picture when it comes to assessing someone’s health; other factors such as waist circumference, diet, and activity level also play a role.

Benefits of Knowing Your BMI

There are a number of benefits to knowing your BMI. Perhaps the most obvious benefit is that it can help you to gauge whether you are a healthy weight for your height. If you are overweight or obese, knowing your BMI can be a useful tool in helping you to lose weight. It can also help you to set realistic weight-loss goals.

In addition, knowing your BMI can help you to avoid health problems associated with being overweight or obese. For example, those who are overweight or obese are at increased risk for developing type 2 diabetes, high blood pressure, and heart disease. By knowing your BMI, you can take steps to reduce your risk for these and other health problems.

Finally, understanding your BMI can simply give you a better understanding of your overall health. It can provide valuable information about your body composition and how much fat you are carrying around. This knowledge can be empowering and motivating, especially if you are trying to make healthier lifestyle choices.

Risks Associated with Low or High BMIs

There are a number of risks associated with having a low or high BMI. Low BMIs can increase the risk of developing health problems such as anemia, osteoporosis, and eating disorders. High BMIs can increase the risk of developing health problems such as heart disease, stroke, and type 2 diabetes.

How to Maintain a Healthy BMI

If you want to maintain a healthy body weight and BMI, there are a few things you can do. First, make sure you’re eating a balanced diet that includes plenty of fruits, vegetables, and whole grains. You should also limit your intake of saturated fats, trans fats, and added sugars. And be sure to get enough physical activity every day—aim for at least 30 minutes of moderate-intensity aerobic activity most days of the week.

Second, watch your portion sizes. It’s easy to overeat, even if you’re eating healthy foods. So pay attention to how much you’re eating and be mindful of when you start to feel full. Stop eating when you’re no longer hungry and avoid second helpings.

Finally, monitor your weight regularly. If you see that your weight is starting to creep up, make some changes to your diet and activity level so that you can get back on track. 

Alternatives to Calculating Your BMI

Body mass index, or BMI, is a measure of body fat based on height and weight that applies to both adult men and women. BMI does not measure body fat directly, but it is a reliable indicator of body fatness for most people.

There are a few alternatives to calculating your BMI:

  1. Waist-to-height ratio: This measures your waist circumference divided by your height. A healthy ratio is below 0.5 for women and below 0.6 for men.
  2. Body fat percentage: This measures the amount of fat in your body by using skinfold calipers to pinch different areas of skin and underlying fat deposits. However, this method is not as accurate as other methods and can be subject to error.
  3. Bioelectrical impedance analysis: This uses a very low electrical current to estimate the proportion of water in your body, which is then used to calculate body fat percentage. However, this method can also be inaccurate, especially if you are dehydrated or have any type of medical condition that affects the amount of water in your body.