Calculator For Kids

Welcome to our kid’s BMI calculator. It is suitable for anyone from one year of age to anyone under 19 years of age. Simply input the information and gain your results. Below you will find information about what your child’s BMI value means. If you are looking for our adult BMI calculator, click here.

 

BMI Calculator
Use this calculator to check your kid's body mass index (BMI).
Unit type
Select gender
Age
yr.
mth.
Please enter value between 0 and 19 years.
Height
cm.
Please enter value between 40 and 225.
Weight
kg.
Please enter value between 1.0 and 250.0 ( one decimal ).
Height
ft.
in.
Please enter value between 1.4 and 7.3
Weight
lb.
st.
Please enter value between 2.3 and 500.0 ( one decimal ).
Calculate BMI
Use this calculator to check your body mass index (BMI), which can be a helpful tool in determining your weight category. Or, use it to calculate your child’s BMI.

 

 

Understanding Your Child’s BMI Results

 

Body Mass Index (BMI) is a tool used to assess your child’s weight in relation to their height. However, unlike adults, children’s BMI is compared to other children of the same age and sex. This is called BMI-for-age.

 

 Understanding BMI-for-age Percentiles

Your child’s BMI-for-age result will be shown as a percentile. This means that your child’s weight is compared to other children of the same age and sex.

  •  Below the 5th percentile: This generally means your child is underweight.
  •  Between the 5th and 85th percentiles: This is considered a healthy weight range.
  •  Between the 85th and 95th percentiles: This indicates overweight.
  •  Above the 95th percentile: This suggests obesity.

 

Understanding Percentiles with an Example

When we talk about your child’s BMI being in a certain percentile, it means we’re comparing them to other children of the same age and sex. A higher percentile means your child’s weight is higher compared to others, and a lower percentile means their weight is lower compared to others.

Imagine a class of 25 girls aged 12. Let’s say there’s a girl named Lily who is 12 years old. She’s 5 feet tall and weighs 80 pounds. When we calculate her BMI and compare it to other 12-year-old girls, we find that her BMI is in the 75th percentile. This means that Lily is taller and/or heavier than 75% of the other 12-year-old girls in the group. Only 25% of the girls in her age group are taller and/or heavier than her.

Remember: This is just an example. It’s important to consider other factors like muscle mass, bone structure, and overall health when interpreting BMI percentiles.

 

Important Notes About Children’s BMI

  •  Growth spurts: Children experience growth spurts at different ages. A temporary increase in BMI during a growth spurt is normal.
  •  Muscle mass: Children, especially active ones, may have a higher BMI due to muscle mass rather than excess body fat.
  •  Individual differences: Children vary greatly in size and shape. BMI is just one tool to assess a child’s health.

It’s crucial to remember that BMI is just one indicator of your child’s health. Other factors, such as diet, physical activity, and overall growth and development, play a significant role. If you have concerns about your child’s weight or growth, consult with a healthcare professional. They can provide personalized advice and guidance based on your child’s specific needs.

 

 

 

 

author avatar
Jason Demant Clinical Hypnotherapist
London hypnotherapist. Seeing clients in King's Cross and online. Diploma in clinical hypnotherapy, counselling and Neuro-linguistic programming (NLP) from Life Matters Training College, based on Harley Street, London. Fully insured and a validated practitioner of the General Hypnotherapy Standards Council and member of the General Hypnotherapy Register.