BMI Percentile Calculator

What is BMI?

The Body Mass Index (BMI) is a screening tool for detecting potential weight issues in youngsters. A person’s BMI is computed using their weight and height.

This calculator can assist evaluate if a child’s weight is appropriate for his or her height, age, and gender. Boys and girls have different quantities of body fat, muscle, and bone as they get older. This BMI calculator accounts for variances in height, age, and gender, making it one of the most useful tools for assessing the weight of a developing child.

It’s important to remember that BMI isn’t a diagnostic tool. Body fat is not directly measured by BMI or BMI-percentile-for-age. Extra muscle mass, not necessarily excess body fat, can cause a high BMI for age in very athletic children. As a result, a child may have a high BMI for their age and gender, but more testing is required to identify whether excess fat is a concern. As a result, children with a BMI-percentile-for-age greater than the 85th percentile should be assessed by a health expert.

To compute percentiles for BMI, Height, and Weight, all numbers must be entered.


How Do You Figure Out BMI Percentile?

Body Mass Index (BMI) is a simple calculation that can be done with merely body mass and height by using the BMI formula:

BMi calculating formula with apple
BMI = weight / height²

Because BMI units are kg/m², weight and height must be in SI units (kilograms and meters, respectively). Remember that you can use any of our converters or change the units directly in our BMI percentile calculator.

What is BMI classification?

The BMI charts for children and adults are not the same. First and foremost, you must interpret a unique pediatric growth chart (or use our BMI percentile calculator) to determine where your child falls inside the percentiles.

This is because a prepubescent child’s BMI may be unreliable because they tend to grow quickly, making their BMI particularly inaccurate. Teens, especially females, gain weight quickly during puberty, and their BMI rises as a result. Because muscles weigh more than fat, a child’s BMI may be higher and perhaps erroneous if they are sporty.

Why is the BMI chart for children useful?

Any indicators of developmental abnormalities are immediately detected via a pediatric growth chart. There are certain thresholds that indicate that action is required:

BMI for Age – Weight Status Categories

A BMI Percentile of:Suggests that a child is:
Less than the 5th percentileUnderweight
5th percentile to less than the 85th percentileHealthy Weight
85th to less than the 95th percentileOverweight
Equal to or greater than the 95th percentileObese

Because the youngster is underweight, he or she is below the fifth percentile. Loss of appetite, a growth spurt, or more serious disorders, such as a result of the mother smoking during pregnancy, are all possible causes of a child’s low weight. Calorie restriction may be beneficial in all of these situations.

The night is the most important part of the day for a child’s appropriate development. It’s not just about getting enough sleep but also about going to bed at the right time because of hormone release. Because the biggest pulses happen before midnight, all youngsters (including teenagers) should be sleeping at that time.

Why is BMI important?

Beginning at the age of two, the American Academy of Pediatrics (AAP) and the Centers for Disease Control and Prevention (CDC) recommend using BMI to screen for overweight and obesity in children.

Keeping track of your child’s weight

Using the appropriate CDC growth chart to plot a kid’s BMI for age can alert parents to early signals that their child is gaining weight too quickly, allowing them to help their child avoid developing weight problems by making simple modifications to their family’s diet and physical activity routines. Parents who plot the calculator findings should look for substantial “drifting,” either up or down, in their child’s BMI-for-age percentile over time, according to Roman Shypailo, a CNRC body composition expert who developed the calculator.

How to interpret BMI chart for teens/kids?

You’ll see some numbers after entering all of the required information into this BMI calculator for kids. The first is the precise percentile result, as previously stated. The range in which your child falls, for example, between the 15th and 50th percentile, is just below that.

A BMI percentile below the 5th percentile or beyond the 95th percentile should be cause for concern. In the first situation, it could indicate that your child is underweight for his or her height. In the second, they are overweight and may need to lose weight. We urge that you visit a physician and a dietitian in both cases. Always check your child’s weight before giving them any medication, as the dosage may vary based on their weight. For additional information on this issue, see our paracetamol calculator.

Otherwise, check out the details listed below.

Body Mass Index for Age Percentiles (Boys)

Body Mass Index for Age Percentiles (Girls)

When looking at a pediatric growth chart, doctors see the pace of growth as a significant factor:

  • As the child grows, the percentile line on the chart should remain the same.
  • If your findings cross two or more percentile lines (rising or falling by at least two ranges), such as from the 75th to the 85th percentile to the 15th to the 25th percentile, you should see a doctor.
  • Check if the baby has always been in those ranges if their BMI is below the 5th or above the 95th percentile. Consult a doctor if your youngster has recently reached these ranges. A visit to a dietitian may also be beneficial, as well as limiting their daily calorie intake.

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