Body Mass Index Calculator

Whether you want to know if you are obese, overweight, underweight, or healthy in terms of weight, our Body Mass Index (BMI) calculator may help you decide if your body mass index is acceptable or not. Simply enter your height and weight in the appropriate units into the calculator. Then click on the "Calculate" button to estimate your BMI.

Choose a Calculation

Body Mass Index Calculator: The bigger your BMI, the more likely you are to suffer from illnesses such as high blood pressure, heart disease, type 2 diabetes, gallstones, and respiratory difficulties. There is no need to be concerned since you may use an online Body Mass Index (BMI) calculator to help you. In the part that follows, you will learn how to calculate the BMI and how it is useful.

What is Body Mass Index?

A Body Mass Index (BMI) is an easy and convenient way to determine whether you are overweight, obese, underweight, or healthy in terms of weight. It depends on height and weight and is standardized for both men and women. The BMI is an approximate measure based on an overall average - if you have a large frame and are well-built, your BMI may be higher than an average person, but within the healthy range.

How BMI is useful?

You can use your BMI score to evaluate risk factors for certain diseases and illnesses. The higher your BMI score, the higher your risk for ailments like high blood pressure, heart disease, type 2 diabetes, gallstones, breathing problems, and some types of cancer. Having a high BMI and being concerned about your health may be a sign you should see your doctor.

Body Mass Index Chart

Body Mass Index value

Remarks on the equivalent BMI

Less than 20


Between 20 to 25


Between 25 to 30


Between 30 to 40


Above 40

Morbidly Obese

How to Calculate BMI using the formulae?

To calculate the BMI, we need mainly two parameters from a person. First is the body weight of a person & total height of a person.

  • Just need to divide the weight of a person by the square of his height.
  • Once we get the body weight of a person in kilograms & total height of a person in meters, then we can apply the formula to calculate BMI.

The formula of BMI = (Body Weight) / (Body Height)2

Here, weight is measured in kg & height is measured in meters.

  • If a person wants to calculate BMI using imperial units, then we need the body weight of a person in pounds & total height of a person in inches. Then we can apply the formula to calculate BMI using imperial units.

BMI Formula = (Weight in Pounds ⨰ 703) / (Height in Inches)²

  • Once we get the BMI, we can assess the health of a person & if the value of BMI is very high then it is recommended to consult a doctor.

Begin using other calculators for your convenience, and go to Arithmetic Calculators for information regarding math concepts.

Solved Example of BMI Calculation using Age

Example: If a person has a body weight of 85kg & body height of a person is 1.66m. Then what is the body mass index of a person?

Solution: Firstly, we will check what is given in the above example. 

That is weight = 85kg & height = 1.66m

Now, to calculate the body mass index,

Formula of BMI = (Body Weight) / (Body Height)²

= (85) / (1.66)² = (85) / (2.75)

= 30.90

By referring to the BMI chart, we can say that BMI of this person lies between overweight & obese.

FAQs on Body Mass Index Calculator

1. Is a body mass index of 21 good?

Yes, 21 can be considered as a normal BMI, because the normal BMI in adults is seen between 18.5 to under 24.9.

2. What is the normal BMI of a person?

The normal BMI of a person ranges between 18.5 and 24.9. So, if you are having BMI below 18.5, then you're in the underweight range and if you are having BMI between 25 and 29.9 then you will be considered in the overweight range.

3. How do you calculate BMI with pounds?

To calculate BMI with pounds and inches you can use this Body Mass Index formula, 

BMI = (body weight in pounds) / (body height in inches) ⨰ 703.

4. What is the method to calculate your ideal body weight?

The ideal body weight can be computed using a simple method, the weight equivalent to an ideal body mass index of 22 kg/m² is considered the ideal body weight.

BMI calculator