Calculate Body Mass Index for Adults and Kids


INPUT YOUR AGE calculate age here*
To calculate bmi for kids is 2 to 20 years and more then 20 years is for adults
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Your BMI is..

About BMI

BMI or Body Mass Index is an index that indicates human health based on the height and weight of the body. The value calculated from the body mass or weight and height of a person. The body mass divided by the square of body height is indicated Body Mass Index or BMI. The unit of BMI is Kg/m2, where kg for body mass in kilogram and height in meter (m).

BMI indicator used to determine the underweight, normal weight, overweight, or obesity of a person.

This indicator widely uses to measure body health but it also has limitations. It is an estimation that is not considered body composition. Differences in body type and distribution of bone, muscle, and fat can not define BMI as the only method to determine the health status. Other health indicators also used along with the BMI.

BMI for women or men:

Adult women with more then 20 years of age considered normal if BMI falls between 18.5 - 24.9 kg/m2for all body types and ages. In general, with the same BMI as men and women, women tend to have more fat than men. So the level of body fitness may differ for the same BMI for men and women.

Similarly, older people tend to have more fat than younger and athletes have less fat than non-athletes.

BMI calculation for children:

The methods and measurement procedures are different for children between the age of 2-20 years of age. Children's health status defined with percentile, calculated with age, gender, height , and weight-based on CDC guides line.

BMI CDC (Centres for Disease Control and Prevention) Chart for boys and girls according to BMI-age percentile growth given below. To download the BMI CDC chart click the link below.

Download BMI Chart

How to calculate BMI?

A simple general method or formula used to determine the BMI of a person is to divide body mass by square of height. To calculate BMI in SI units the body mass considered in Kilogram and height in miter and in the USC system body mass is considered in pounds and height in inches. Besides the Ponderal Index (PI) methods used similar to BMI.


BMI=Body mass(kg) / height(m)2


BMI=703 x Body mass(lbs) / height(in)2

Categories based on BMI for Women, Men, Children, and Teens.

WHO's categories for adults Men and women:The World Health Organisation recommended the following categories for BMI. The healthy BMI range considered 18.5-24.9 kg/m2

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

BMI category for children and teens age 2 to 20 years:According to the CDC or Centers for Disease Control, a Prevention category considered percentile calculated base on BMI and age, and sex. Table shows below the category based on percentile.The CDC charts are different for boys and girls.

Percentile (%ile) Status / Category
<5%< /td> Underweight
5%-85% Healthy Weight
85%-95% Overweight
95% Obese

BMI for country-specific people like in America, India, etc.

BMI range differs significantly by ethnicity throughout the world as ethnicity differs in different countries. As per WHO is normal BMI is 18.5-25, which follows the same in different countrues. And the same formula uses to calculate BMI. But the adverse effect of obesity is the same in whether in India, the USA, or other countries.

Who should not use BMI?

The following person should not use BMI

  1. Muscle builders
  2. Pregnant women
  3. Young or elderly children
  4. Athletes

Features of this BMI calculator:

  • It is a completely offline process for the calculation of adult BMI. we do not collect your information. As kids, BMI calculation methods are complex so it is processed in the server but we do not store the information.
  • This online BMI calculator displays the most accurate result from your data.
  • It automatically detects whether you kids or an adult when you enter your age.
  • It also gives you over all concept of BMI and how to calculate it.

How to use this BMI calculator?

  1. Just enter in required fields.
  2. Press "CALCULATE" button.
  3. The calculation shows BMI and Category.
  4. To calculate again press 'NEW CALCULATION' button.

IMPORTANT:BMI is not the only indicator to determine health status. Other health indicators also used along with the BMI to get your health status. In our online tools for BMI, tried our best to calculate the accurate value. It is suggested to check other tools to compare the value. If you have any problem or want suggest us please feel free to contact us. While our efforts to make this calculator perfect. So, we are not liable by any means for damage for using this online calculator. Please visit our disclaimerbefore using this. This is pure as a service to you, so use your won risk.