Body mass index, or BMI, may be a measure of body size. It combines a person’s weight with their height. The results of a BMI measurement can give a thought about whether an individual has the right weight for his or her height.
BMI may be a screening tool which will indicate whether an individual is underweight or if they need a healthy weight, excess weight, or obesity. If a person’s BMI is outside of the healthy range, their health risks may increase significantly.
Carrying an excessive amount of weight can cause a spread of health conditions, like type 2 diabetes, high vital sign , and cardiovascular problems.
A weigh that’s too low can increase the danger of malnutrition, osteoporosis, and anemia. The doctor will make suitable recommendations.
BMI doesn’t measure body fat directly, and it doesn’t account for age, sex, ethnicity, or muscle mass in adults.
However, it uses standard weight status categories which will help doctors to trace weight status across populations and identify potential issues in individuals.
BMI in adults
Calculating BMI involves measuring a person’s height and weight .
- To calculate BMI in metric units, use the followingTrusted Source method: BMI = kg/m2
- So, to calculate an adult’s BMI: Divide their weight in kilograms (kg) by the square of their height in meters (m2)
Since most of the people measure height in centimeters (cm), divide height in cm by 100 to urge height in meters.
- When using imperial units, the formula is: BMI = lbs x 703/in2
- In other words: Multiply a person’s weight in pounds (lbs) by 703. Then divide by their height in inches, squared (in2)
To avoid using the maths , an individual can use a calculator or a chart to seek out their BMI.
Enter height or weight in either imperial or metric measurements to seek out your BMI.
People also can compute their BMI employing a chart. Click here to ascertain a chart provided byTrusted Source the National Heart, Lung, and Blood Institute (NHLBI).
Locate your height in inches on the side of the chart, then look out on to seek out your weight in pounds. Scan to the highest to ascertain if the result corresponds to a traditional weight, overweight, or obesity.
Understanding the results
The following table shows standard weight status categories related to BMI ranges for adults.
|30.0 and above||Obese|
BMI of but 18.5
A BMI of but 18.5 indicates that you simply are underweight, so you’ll got to placed on some weight. you’re recommended to ask your doctor or a dietitian for advice.BMI of 18.5–24.9
A BMI of 18.5-24.9 indicates that you simply are at a healthy weight for your height. By maintaining a healthy weight, you lower your risk of developing serious health problems.BMI of 25–29.9
A BMI of 25-29.9 indicates that you simply are slightly overweight. you’ll be advised to lose some weight for health reasons. you’re recommended to speak to your doctor or a dietitian for advice.BMI of over 30
A BMI of over 30 indicates that you simply are heavily overweight. Your health could also be in danger if you are doing not reduce . you’re recommended to speak to your doctor or a dietitian for advice.
BMI in children and teenagers
In adults, BMI values aren’t linked to age and are an equivalent for both sexes.
However, measuring BMI in children and teenagers is slightly different. Girls and boys develop at different rates and have different amounts of body fat at different ages. For this reason, BMI measurements during childhood and adolescence take age and sex into consideration.
Doctors and other health professionals don’t categorize children by healthy weight ranges because:
- they change with monthly aged
- male and feminine body types change at different rates
- they change because the child grows taller
Doctors calculate BMI for youngsters and teenagers within the same way as they are doing for adults, by measuring height and weight. Then they locate the BMI number and person’s age on a sex-specific BMI-for-age chart. this may indicate whether the kid is within a healthy range.
Calculator and charts for child and teenage BMI
The Centers for Disease Control and Prevention (CDC) have produced a calculator that gives BMI and therefore the corresponding BMI-for-age percentile on a CDC growth chart for youngsters and teenagers .
First, click here for the calculatorTrusted Source.
Next, use the charts to ascertain if a child’s weight is suitable for his or her age.
Click here for the charts:
- Girls aged 2 to twenty years Trusted Source
- Boys aged 2 to twenty yearsTrusted Source
What do the results mean?
The following categories explain the meaning of the results:
- Weight status category Percentile range
- Underweight Below the 5th percentile
- Healthy weight 5th percentile to but the 85th percentile
- Overweight 85th to but the 95th percentile
- Obesity Equal to or greater than the 95th percentile
How doctors use BMI
BMI isn’t accurate enough to use as a diagnostic tool, but it can screen for potential weight problems in adults and youngsters .
If someone features a high or low BMI, a doctor or other healthcare professional might then consider other factors, such as:
- skinfold thickness measurements, which indicate what proportion fat is within the body in adults and youngsters
- evaluations of diet and physical activity
- discuss any case history of the disorder and other health problems
- recommend other appropriate health screenings
- The doctor or healthcare professional can then make diet and exercise recommendations that supported these results.
Health risks of additional weight
Excess weight has the subsequent effects on the body:
- It increases how hard the guts has got to work.
- It raises vital sign , blood cholesterol and triglyceride levels.
- It lowers HDL (HDL), or good cholesterol levels.
- It can make diabetes and other health problems more likely.
According to the National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), carrying extra weight can increase the danger of the subsequent conditions:
- hypertension, or high vital sign
- dyslipidemia, which involves high LDL cholesterol , low HDL cholesterol , or high levels of triglycerides
- type 2 diabetes
- coronary heart condition
- gallbladder disease
- sleep apnea and respiratory problems
- some cancers, including endometrial, breast and carcinoma
Carrying extra weight as a toddler or teenager also can pose significant health risks, both during childhood and into adulthood.
As with adult obesity, childhood obesity increases the danger of varied health problems, including disorder , diabetes, and apnea .
The American Heart Association (AHA), means that children with a high BMI even have a better risk of:
- low self-esteem and psychological stress
Benefits of a healthy weight
Apart from reducing the danger of the health conditions, maintaining a healthy weight offers additional benefits:
- fewer joint and muscle pains
- increased energy and skill to hitch in additional activities
- improved regulation of bodily fluids and vital sign
- reduced burden on the guts and cardiovascular system
- improved sleep patterns
Other measures of a healthy body
BMI may be a useful gizmo , but it cannot identify whether a person’s weight is formed from muscle or fat.
For example, an athlete with tons of muscle tissue may have a better BMI than an individual who isn’t very active. But, this doesn’t mean that the athlete is overweight or unhealthy.
In addition, disorder and high vital sign are more likely to occur in people that have additional fat — referred to as visceral fat — around their middle instead of their hips.
Other measures of body size include waist-hip ratio, waist-to-height ratio, and body composition, which measures body fat and lean body mass. These measurement systems focus more on the quantity of fat an individual has and its distribution round the body.
Together with BMI, these additional measures can help to assess more accurately the health risks related to an individual’s weight.