WHO Growth Chart Calculator (0–60 months)
Enter your child’s details to estimate weight-for-age, height-for-age, and BMI-for-age z-scores and percentiles.
Educational tool only. This calculator uses interpolated WHO-style reference values for ages 0–60 months and is not a substitute for pediatric clinical assessment.
What is a WHO growth chart calculator?
A WHO growth chart calculator helps compare a child’s measurements with international growth standards. Instead of looking only at raw weight or height, it shows how a child compares to other healthy children of the same age and sex.
Clinicians usually evaluate growth with z-scores (standard deviation scores) and percentiles. These indicators help identify whether growth is following an expected trajectory or if further assessment may be needed.
How this calculator works
This tool estimates three common growth indicators:
- Weight-for-age (WFA): Screens for low or high body weight relative to age.
- Height-for-age (HFA): Screens for shorter or taller stature relative to age.
- BMI-for-age (BMIFA): Uses weight and height together to assess body size patterns.
After entering age, sex, weight, and length/height, the calculator estimates z-scores and percentiles using age-based interpolation. A short interpretation is then provided for each metric.
Why z-scores matter
Percentiles are easy to read, but z-scores are better for tracking change over time and for identifying clinically meaningful shifts. In growth monitoring, values below -2 SD or above +2 SD typically deserve closer review by a health professional.
Tips for accurate measurements
- Measure at roughly the same time of day when possible.
- Use a calibrated scale and remove heavy clothing before weighing.
- For children under 2 years, recumbent length is generally preferred.
- For older toddlers and preschoolers, standing height is more common.
- Record values to one decimal place for better trend tracking.
Interpreting results responsibly
One measurement should never be used alone to make health decisions. Pediatricians focus on trends across multiple visits, feeding history, illness, activity level, and family growth patterns.
A percentile is not a “grade.” For example, the 25th percentile can be perfectly healthy if the child is consistently tracking near that line over time.
When to consult a pediatric professional
- Rapid drop across growth channels over a short period.
- Persistent values below -2 SD or above +2 SD.
- Concerns about feeding, development, chronic illness, or hydration.
- Any parental concern about appetite, energy, or visible growth change.
Frequently asked questions
Is this identical to clinical software?
No. Clinical systems may use exact WHO LMS tables and additional quality checks. This page provides a practical educational estimate, not a diagnostic tool.
What age range is supported?
This calculator supports children from birth to 60 months (0 to 5 years), matching the common WHO under-five growth monitoring range.
Can I use this to diagnose undernutrition or obesity?
No. Only qualified healthcare providers can diagnose growth disorders or nutrition-related conditions. Use this output to guide discussion, not to self-diagnose.