Height
Height Percentile Tracking
Check your child's height or recumbent length against WHO and CDC growth standards for exact age and sex.
About this site
About Growth Chart Calculator
Growth Chart Calculator is a free online tool that helps parents track their child's height, weight, head circumference, and BMI percentiles from birth to age 20 using WHO and CDC growth standards.
Independent and parent-focused
Who We Are
We are an independent team focused on making pediatric growth data easier for parents to access and easier to understand. Growth Chart Calculator was built around a simple problem: growth charts are everywhere, but plain-language explanations of what those numbers mean for an individual child are often hard to find.
Our goal is to give families accurate percentile results with clear, jargon-light context so checkup conversations can start from understanding rather than confusion. We write for parents first, while staying anchored to established WHO and CDC growth references.
How the calculator helps
What This Tool Does
Weight
Weight Percentile Tracking
See how weight compares with same-age peers by using internationally recognized pediatric reference data.
BMI
BMI-for-Age Percentile
Calculate BMI percentile for ages 2 to 20 and pair the result with plain-language interpretation.
Head
Head Circumference Tracking
Monitor head growth for infants and toddlers through the first 36 months, where this measurement matters most.
WHO + CDC
WHO and CDC Standards
Use WHO standards from birth to 24 months and CDC growth charts from age 2 onward, matching the age split used in U.S. pediatric practice.
Privacy
Privacy-First Calculations
Percentile calculations run in your browser. We do not send a child's measurements to our server, and saved profiles stay local to your browser unless you export them.
Authoritative references
Our Data Sources
The growth reference data used in this calculator comes from internationally recognized public-health authorities rather than from custom or editorialized reference tables. These sources define the measurement distributions that the percentile outputs are based on.
World Health Organization
WHO Child Growth Standards (2006)
- Used for
- Birth to 24 months
- Source
- WHO Multicentre Growth Reference Study (MGRS)
- Official link
- who.int/tools/child-growth-standards
Centers for Disease Control and Prevention
CDC Growth Charts (2000 revision)
- Used for
- 2 to 20 years
- Source
- National Center for Health Statistics (NCHS)
- Official link
- cdc.gov/growthcharts
We do not rewrite or editorialize the underlying reference parameters. Percentiles are calculated locally in the browser with the published LMS method used by WHO and CDC growth references.
Important
Medical Disclaimer
This tool is for informational purposes only.
Growth Chart Calculator is designed to provide general reference information to help parents understand growth measurements. It is not a medical device, it does not provide diagnoses, and it is not medical advice or a substitute for professional medical advice.
Percentile results should always be interpreted in the context of a child's health history, feeding pattern, family background, and clinical assessment by a qualified healthcare provider. If you are concerned about your child's growth, weight, height, or development, consult a healthcare professional or your child's pediatrician.
Do not delay seeking medical advice because of information you read on this website.
Reach our team
Contact Us
We welcome questions, feedback, and partnership inquiries.
We aim to respond to all inquiries within 2-3 business days.
What you can reach us about
- General questions about the calculator
- Feedback on growth chart data or percentile results
- Bug reports or technical issues
- Content correction requests
- Partnership or collaboration inquiries
Required policy pages
Legal Links
For privacy, usage terms, and the site-wide informational disclaimer, use the policy pages below. These pages are available from the main site footer as well.
Legal & Policies