BMI Calculator

The (Body mass index) BMI calculator helps you measure body fat on the basis of your height and weight for both men and women. Estimate whether you are healthy, overweight, or underweight. It also serves you in finding the BMI of your children.

Age (2-20 years):

The calculation of an individual's leanness or corpulence in accordance with height and weight is known as body mass index. The BMI is also projected as the quantity of tissue mass. The primary purpose of calculating the BMI of a person is to find whether he/she has healthy body weight for his/her height.

BMI calculator is used to measures whether the person is underweight, overweight, healthy weight, or obese. Age, region, and height are crucial factors that must be mentioned while finding the BMI. The estimation of your body mass index will help you find the current health situation and enable you to take required actions timely.

It’s an advanced web-based utility that saves you from making any manual efforts and provides you instant results.

BMI Formula in Kilograms and metres =

Weight (kg) [Height (m)] 2

In the metric system, the formula for BMI is weight in kilograms divided by height in metres squared.

BMI Formula in Pounds and inches =

Weight (lbs) [Height (in)] 2 x 703

Divide weight in pounds by height in inches squared then multiply by a conversion factor of 703 to calculate BMI.

Calculate your BMI straightaway by following the simple and easy to perform instructions given below.

  • Access this online BMI calculator after landing on
  • Then insert your age, weight, and height in the respective fields.
  • After entering all the inputs, press the Calculate button to start the processing.

The BMI calculator will process your query and provide you with reliable body mass index results against your input.

The following table is the world health organization's recommended body weight for adults and can be used for both genders with the age 18 or above.

Category BMI range - kg/m2
Severe Thinness < 16
Moderate Thinness 16 - 17
Mild Thinness 17 - 18.5
Normal 18.5 - 25
Overweight 25 - 30
Obese Class I 30 - 35
Obese Class II 35 - 40
Obese Class III > 40

For teens and children aged between 2 to 18, the centre for disease control and prevention has recommended the BMI table shared below.

Category Percentile Range
Underweight < 5%
Healthy weight 5% - 85%
At risk of overweight 85% - 95%
Overweight > 95%

The BMI is divided into four categories depending on an individual's height, weight, and age. We have elaborated the BMI categories below to help you understand the results gained from the BMI calculator effectively.


If you find out that you are underweight after getting the results from the BMI calculator, then it denotes that you are not eating enough and need a good diet. Or you are going through sickness.

Healthy Weight

Individuals who find out that they are healthy must keep up with the routine and diet. Also, it is suggested to continue their workout routine to maintain their healthy weight. You should also regularly calculate your BMI with our free online utility to ensure you are not gaining weight.


People who are overweight must pay attention to their diet and routine. If you find out that you are overweight through our BMI calculator, you need to check your food and diet and increase exercise hours to control your weight and save yourself from various diseases.


Obesity is a severe disease that can cause various diseases in your body. Therefore, it holds great significance to improve your workout routine and has only an organic diet. Moreover, you can also take medicines as per your doctor's instructions.

Individuals who are overweight are more vulnerable to severe diseases and health conditions. The said risks and prominent health issues that can hit the people with overweight are as follows:

  1. Immensely High Blood pressure (BP)
  2. Excessive levels of bad cholesterol or low levels of HDL (good cholesterol).
  3. Diabetes
  4. Heart Problems
  5. Brain Strokes
  6. Gallbladder disease
  7. Breathing Issues
  8. Cancers
  9. Disturb Sleep
  10. Joint Diseases
  11. Severe headache, mental illness, and depression
  12. Body Pain
  13. Higher risk of mortality

The shared list might have educated you about the negative and even some fatal outcomes that can cause due to being overweight. Therefore, a person needs to maintain BMI below 25 kg/m2, and if you have more BMI, you must consult a doctor and change your life routine and diet as per the instructions.

Similarly, underweight individuals may also face different issues and risks shared below.

  • Vitamin deficiencies, Anemia
  • Weak bones
  • Disturbed immune function
  • Growth Problems
  • Reproductive issues (particularly for women because of hormonal imbalance)
  • Unexpected complications as a result of surgery

If you have found through the BMI test that you are underweight, you must consult your doctor, especially if you are not sure about the reason to avoid any underlying condition or diseases.

Undoubtedly, BMI is a useful method to check healthy body fat, but it also includes various limitations. It is important to understand that BMI is only a measurement that doesn't include body composition. There are various types of body types with the distribution of muscle mass and fat. Therefore, the perfect way to get reliable and accurate results is using other measurements rather than relying only on this sole method.

In adults

The primary issue with the BMI method is that it is an estimation of body weight instead of body fats. The prominent aspects or components that influence BMI are age, weight, height, etc. There might be a possibility that a person who is having a healthy weight but is not active in his daily life. You can easily understand that there is a high possibility that the person has excess body fat, which will make him unhealthy. Similarly, athletes are considered overweight if they have muscles heavier than fat; however, there is a possibility that they are heavyweight because of their body composition. It has also been observed that women have more body fat than men. Must explore a list of countries by body mass index.

In children

The factors we have discussed limit the usefulness of BMI for adults also affect its efficacy for children. We have found that height and weight are the most influential factors for BMI and body fat among youngsters. However, we can say that BMI is a more reliable indicator of excess body fat for obese children than overweight children.

BMI calculators are not ideal for athletes, bodybuilders, pregnant women, young children, etc. The major reason behind this statement is BMI cannot differentiate whether the weight is carried as muscle or fat, as it mainly relies on the numbers. For example, athletes or muscle builders mostly have high BMI not because they are overweight but they have higher muscle mass. You cannot say on the basis of BMI results that they are at high health risk at all. Similarly, children or elders might be losing some muscle, and that's why they have lower BMI, but it cannot be claimed that they are vulnerable to diseases. Furthermore, pregnant women often face various body composition changes, so an Adult BMI calculator is not adequate at all for them in that scenario.

Frequently Asked Questions

The body mass index (BMI) estimates your health structure on the basis of your height and weight. However, the precision of the results as an indicator of body fatness seems higher in individuals with higher levels of body fatness and BMI. For example, a person with a high BMI (38 kg/ m2) is expected to have higher body fat. But, it would be hard to define that it's because of weight or muscle mass. Consulting a doctor for better and proper health assessments would be a better option to ensure your health status.

The ideal BMI for a woman would be between 18.5-24.9. However, muscle mass and body weight are also two critical factors that must be analyzed accurately. Use the BMI calculator for women and make sure you have a perfect BMI.

BMI is interpreted using standard categories for 20 years old and older individuals. There is no difference between males and females in these categories.

BMI Weight Status
Below 18.5 Underweight
18.5 – 24.9 Healthy Weight
25.0 – 29.9 Overweight
30.0 and Above Obesity

For more information, both genders can use the BMI calculator men and women to determine whether they are underweight, healthy, overweight, or obese.

Individuals with BMI between 18.5 to 24.9 fall in the healthy weight range. If anyone is below or above this range, then he/she might be underweight or overweight and need to concentrate on diet and exercise.

If you have a BMI of 25, you will fall under the category of overweight. Therefore, you must focus on your diet and increase physical activities, or else your health status will be at risk.