The Body Mass Index BMI Calculator can be used to determine BMI and weight status, taking into account age. For the International System of Units, select "Metric Units" from the drop-down menu, and for US or metric conversions, select "Other Units". Both Ponderal Index and BMI are also calculated by the calculator. Details for each are provided below.
Enter BMI.
Based on height and weight, a person's BMI is a calculation that determines how thin or fat they are, and is used to estimate the amount of tissue in the body. It is often used as a broad indicator of body weight for height to determine whether a person is healthy. A person is classified as underweight, normal weight, overweight, or obese based on the value obtained from the BMI calculation. These BMI ranges are sometimes further divided into subgroups, such as severely underweight or severely obese, depending on variables such as geography and age. Although BMI is a poor indicator of a healthy body weight, it can be used to determine whether further testing or treatment is necessary.
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Risks of Obesity
Overweight people are more likely to develop a number of serious diseases and health problems. The Centers for Disease Control and Prevention (CDC) has provided the following list of risks.
- High blood pressure
- High levels of triglycerides, low levels of HDL cholesterol, which is generally considered "moderately good cholesterol," and high levels of LDL cholesterol, which is generally considered "bad cholesterol."
- Type II disease
- Coronary artery disease
- Stroke
- Gallbladder disease
- Poor quality of life
- Mental illnesses such as anxiety, severe depression, and others
Risks associated with being underweight
The following are some of the risks related with being underweight:
- Vitamin deficiency, malnutrition, and anemia (low blood vessel capacity)
- Hormonal abnormalities that can interfere with menstruation can cause reproductive problems in women. Additionally, underweight mothers have a higher rate of first-trimester miscarriage.
- Risks related to surgery that may arise.
Adult BMI table
Based on BMI readings, this is the recommended body weight for adults by the World Health Organization (WHO). Both men and women who are at least 20 years old can benefit from it.
BMI Category Range: kg/m2
Significant underweight 16
16 to 17 Mildly moderate underweight Normal 17 to 18.5 - Underweight 17 to 18.5 -
Overweight
25 - 30
Class I obesity 30 to 35
II obesity 35 to 40
Class III obesity
BMI chart for children and young aged 2 to 20
According to the Centers for Disease Control and Prevention (CDC), BMI classification is recommended for children and adolescents aged 2 to 20.
Category Percentile Range
<5% for underweight
5% to 85% Healthy weight
85% to 95% Overweight At risk of becoming overweight
>95%
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