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BMI Calculator

Wee Tool’s Standard BMI Calculator Finds your Body Mass Index. It Categorizes you based on your BMI according to the WHO (World Health Organization).


Pound Kg


Your BMI is 00

What is the Body Mass Index (BMI)?

Body Mass Index is the measurement of body fat or tissue mass of a person corresponding to his/her height and weight. It was first developed by a mathematician from Belgium named Adolphe Quetelet in the 19th century. Now it has become a standard method to find weight in adults.

What is a Body Mass Index (BMI) Calculator?

BMI calculator is a specific tool to find the body mass index of a person. It gives the estimation of whether a person has healthy body weight as compared to his/her age and height. The BMI Calculators have a formula in which weight is measured in Kilometers (Kg) while height is measured in meters (m). This formula is written as:

BMI= Weight(Kg)/Height(m)^2


There are different categories that are made to classify the people according to their BMI value. These are the categories with their values made according to World Health Organization (WHO) and NHLBI:

  1. Underweight: BMI less than 18.5
  2. Normal or Healthy weight: BMI between 18.5 and 24.9
  3. Overweight: BMI between 25 and 29.9
  4. Obesity: BMI 30 or higher

Why Do We Use Body Mass Index (BMI) Calculator?

Simply checking your weight on any scale is not enough. It does not take other conditions as a factor on your weight such as your height, gender and age etc. This is where we need a tool to precisely find our body mass considering other factors. Having more than a normal weight can cause a lot of health diseases with deathrisk. According to the Centres of Disease Control and Prevention (CDC) following are diseases that are caused by obesity:

  • Stroke
  • Type II diabetes
  • High blood pressure and cholesterol levels
  • Coronary heart disease
  • Sleep apnea and breathing problems
  • Mental illnesses
  • Osteoarthritis

On the other hand, there are problems related to being underweight or weak as well

  • A decrease in immune function
  • Growth and development issues
  • Malnutrition, vitamin deficiencies, anemia
  • Osteoporosis
  • Reproductive issues for women

So, in order to protect ourselves from these diseases, we have to eat healthy meals, take proper sleep, exercise regularly and maintain an optimistic body weight.

Where Should We Use Body Mass Index (BMI) Calculator?

BMI Calculator tool has a lot of applications in the healthcare and medical industry.

Health Maintenance and goal tracker:

You can lose and gain weight by setting a goal of healthy weight. It can prevent you from many health related issues and helps to make your lifestyle more healthy and better. This is only possible by checking your weight through a BMI Calculator tool.

Prevention from Health Diseases:

BMI Calculator enables you to prevent and easily detect the arrival of any kind of health issue. Public health organizations also use this tool to do surveys on overall health and obese rate.

Nutritionist Tool:

Many healthcare experts and nutritionists use this tool to check and keep track of their patients weight. People can also share their BMI with their healthcare doctors. They can give you advice and recommendations to maintain a healthy lifestyle.

How to use the BMI Calculator Tool?

Using a BMI calculator is simple and easy:

  • Add Input: Add your height and weight in any unit you want such as inches, feet and pounds into the input box. The tool will automatically convert it into standard units. You can also select your gender.
  • Conversion: Click the “Calculate” button to find your BMI.
  • Output: The tool will quickly calculate your BMI and show it in the output box and classify you according to the categories mentioned above.

Ponderal Index

The Ponderal index is the same as BMI. It measures the leanness and fatness of a body according to its height and weight. The main difference between PI and BMI is that PI is used to consider a wide population instead of an individual. It can also be used to find the weight of a very tall and short person or to calculate an index for an extremely weak and obese person. Its formula differs by adding a cube for height instead of square.

PI = Weight (Kg)/ Height (m)^3

PI = Kg/m^3


BMI Calculator tool helps individuals as well as health experts to check their health status and detect the potential health risks. Keep in mind that it is a weight measuring tool. It does not diagnose illness or diseases. Wee tool’s BMI Calculator is completely free and easy to access. No need for subscription and software installation. Just browse our tool and find your BMI online.