The Body Mass Index (BMI) Calculator can be used to calculate your BMI value and weight status while taking your age into consideration. Use the "metric units" tab if you are more comfortable with the international standard metric units. The referenced weight range and calculation formula is listed following the calculator.
Your BMI is a measurement of your body weight based on your height and weight. Although your BMI does not actually "measure" your percentage of body fat, it is a useful tool to estimate a healthy body weight based on your height. Due to its ease of measurement and calculation, it is the most widely used diagnostic indicator to identify a person's optimal weight depending on his height. Your BMI "number" will inform you if you are underweight, of normal weight, overweight, or obese. However, due to the wide variety of body types, the distribution of muscle and bone mass, etc., it is not appropriate to use this as the only or final indication for diagnosis.
Body Mass Index Formula
The formulas to calculate BMI based on two of the most commonly used unit systems:
BMI = weight(kg)/height2(m2) (Metric Units)
BMI = 703·weight(lb)/height2(in2) (U.S. Units)
BMI Table for Adults
This is the World Health Organization's (WHO) recommended body weight based on BMI values for adults. It is used for both men and women, age 18 or older.
|Category||BMI range - kg/m2|
|Severely underweight||< 16.5|
|Underweight||16.5 - 18.5|
|Normal||18.5 - 25|
|Overweight||25 - 30|
|Obese Class I||30 - 35|
|Obese Class II||35 - 40|
|Obese Class III||> 40|
BMI Chart for Adults
This is a graph of BMI categories based on the World Health Organization data. The dashed lines represent subdivisions within a major categorization.
BMI Table for Children and Teens, Age 2-20
The Centers for Disease Control and Prevention (CDC) recommends BMI categorization for children and teens between age 2 and 20.
|Healthy weight||5% - 85%|
|At risk of overweight||85% - 95%|
BMI Chart for Children and Teens, Age 2-20
The Centers for Disease Control and Prevention (CDC) BMI-for-age percentiles growth charts.chart for boys
chart for girls