Child BMI Calculator: A Simple Way to Monitor Your Child's Growth

What Is the Child BMI Calculator?

The child bmi calculator estimates body mass index for children ages 2 to 19.

Body mass index is weight divided by height squared. The calculator uses metric or imperial units.

It compares the result with Centers for Disease Control and Prevention growth charts.

You see a BMI number. You also see a percentile and a weight status category.

This screening tool helps you track growth at home.

How to Use the Tool

Gather age, gender, weight and height. Choose metric or imperial units, then follow the steps below.

What each field means

• Age: Enter a whole number from 2 to 19.
• Gender: Select boy or girl.
• Unit system: Choose metric or imperial.
• Weight: Enter kilograms or pounds. You can use one decimal.
• Height metric: Enter whole centimeters.
• Height imperial: Enter feet and inches. Inches can include a decimal.

Step-by-Step Instructions

• Select your unit system.
• Type the age from 2 to 19.
• Pick the gender.
• Enter the weight in kilograms or pounds.
• Enter the height in centimeters or in feet and inches.
• Click Calculate BMI.
• Read the BMI and the percentile and the category.

Understanding the Results

Your results include three parts.

BMI appears to one decimal. You also see a percentile by age and gender. You also see a weight status category.

A color bar shows the range. A small marker points to the place on that bar.

A percentile compares your child with peers. Seventieth percentile means higher BMI than 70 percent of peers.

Weight status uses Centers for Disease Control and Prevention ranges.

• Underweight less than the 5th percentile.
• Healthy weight 5th to less than 85th percentile.
• Overweight 85th to less than 95th percentile.
• Obese 95th percentile or higher.

Every child has a unique growth pattern. Use this result as one data point. For care and next steps, speak with a healthcare provider.

This calculator estimates percentiles using Centers for Disease Control and Prevention charts. Values round to whole numbers and BMI rounds to one decimal.

• Age range is 2 to 19 years.
• Measure barefoot and in light clothing.
• The gender field uses boy or girl.
• Growth during puberty can shift BMI for a short time.
• Use the same unit system for each check.
• Large changes or concerns call for a pediatrician visit.

Why Use Our Child BMI Calculator?

It gives fast feedback for growth checks. It supports both metric and imperial units. It helps you plan talks with your pediatrician. It also helps organize notes for checkups.

Common ways families use this child bmi calculator

• Quick screening before a well child visit.
• Track changes during a sports season.
• Review growth after a big height change.
• Share numbers with a dietitian or coach.
• Convert measurements while you compare results.

Making Health Checks Part of Your Routine

Simple habits make results more reliable. Use these tips for steady tracking.

• Measure at the same time each day.
• Use the same scale and measuring tool.
• Enter whole centimeters for metric height.
• Keep notes in a paper or digital journal.
• Review trends each month and adjust as needed.

Many families set a monthly reminder after dinner on Sunday. Small rituals keep the task easy.

Final Thoughts

The child bmi calculator gives a clear view of growth in minutes. Use it to track progress and plan next steps. Make the child bmi calculator part of your health routine. For health advice, speak with a healthcare provider. This calculator uses Centers for Disease Control and Prevention growth charts and gives estimates.