Child growth Percentile Calculator

Child Growth Percentile Calculator - Baby Growth Charts

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Child Growth Percentile Calculator

What Is Growth Percentile?

Growth percentiles are measurements of a child in comparison with other children. The percentiles are usually shown as curved lines on growth charts.

Here is a simpler way to understand:

If your three-month-old daughter is in the 40th percentile for weight, it means 40% of three-month-old girls weigh either the same or less than your baby.The rest 60% weigh more than your baby.

This means that the bigger the percentile number, the bigger the baby compared to other babies that age. If your baby is in the 50th percentile, it means half the children her age weigh more than that number and the other half weigh less than it (1).

Growth Charts – How Do They Work?

Growth charts help in comparing the child’s height, weight, and head circumference with other children of the same age. They help you and the health care provider keep a check on your child’s growth. They also signal if your child has any medical condition.

Boys and girls have separate growth charts as they have different growth patterns. Boys are slightly heavier and taller than girls.

Although each baby is unique and has his or her growth pattern, most healthy babies follow a similar growth pattern. This does not mean that they are of same height and weight, but that they put on weight in proportion to their size and gender.

The growth charts were developed by gathering information from the height, weight, and head-size measurements of thousands of children. The curves on the charts show how many children weigh a certain amount at a certain age (5).

What Do Growth Charts Tell?

Growth charts are designed to track a baby's growth using three parameters:

• Weight

• Height

• Head circumference

Your baby’s doctor will take note of these parameters. Over time, these measurements show if the baby’s growth is on par with the standard growth rate. If it is equal to the standard chart, it is a good sign that your baby is healthy.

The graph shows the percentile your baby falls in, and how she fares in comparison to other babies her age.

What Do Weight-By-Age, Height-By-Age And Head Circumference-By-Age Mean?


Weight-by-age compares your baby’s weight with that of the other babies of the same age. The percentile tells you what percentage of children weigh less than your child. For instance, out of 100 children, a value of 40% means your child weighs more than 40% children, and less than the rest 60%.


Height-by-age chart compares your child’s height with other children of the same age. The percentile tells you what percentage of children is shorter than your child. For instance, out of 100 children, a value of 40% means your child is taller than more than 40% children and shorter than other 60%.

Head circumference-by-age:

Head circumference-by-age compares your child’s head circumference based on age. The percentile shows what percentage of children have a head smaller than your child’s. For instance, of 100 children, a value of 40% means your child’s head is bigger than 40% children and smaller than the rest 60%.

How Big Or Small Is Your Child?

The child growth percentile calculator shows your child’s size in comparison to other children of the same age. You just have to enter your child’s weight, height, and head circumference along with gender and age to calculate the percentile for each parameter (weight, height, or head circumference). You will get a number that reflects the percentage of children who are smaller or larger. Your doctor will also note these numbers to ensure your baby is growing healthily (2).

What If My Baby's Growth Curve Does Not Follow The Chart?

Your baby’s growth curve can show temporary ups and downs that are normal and should not be alarming. Ups may be due to growth spurt and downs can happen due to illness.

However, if these happen for longer periods, then your child’s doctor will examine the baby to check if anything is wrong. If your baby is breastfeeding, then the provider will check if she is latching on correctly. If your baby is on solid foods, the provider may ask about her stool (3).

The health care provider will keep an eye on differences in percentiles. For instance, if your baby is in the 75th percentile for height and 25th for weight, you would be asked to feed your baby well, so she puts on weight.

Therefore, if you have a concern regarding the baby’s growth curve, it is best to see a doctor for advice.

What Can I Do To Get My Baby On A Higher Percentile Curve?

The primary objective of using a growth chart to track baby’s measurements is not to put her on a high percentile curve. It is to ensure that whatever percentile your baby is in, she grows along that curve.

If the curve has fallen, your child’s doctor will advise you on ways to get your baby back to her original percentile. Unless any medical illness or concern is affecting the baby’s growth, all the percentiles are considered normal.

If the baby is premature, your doctor will suggest a different growth chart to track the baby’s growth. This is adjusted as per her age (calculated from due date) but not chronological age (calculated from the date of birth).

Premature and low birth weight babies may start on a low percentile curve. But they usually catch up with their peers by the age of three (4).

Disclaimer: While the growth percentile calculator tells you what growth percentile your child falls in, it is imperative that you consult a doctor before making any changes in the child's diet, exercise regime, etc. You must remember that a percentile value is not the same as actual growth value, but a comparison of your child's growth with other children of that age group. Hence, a doctor would help you best in understanding if there are any developmental delays in your child, and ways of correcting them.

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