WHO growth calculator 0 to 24 months
Calculate WHO infant chart percentiles for weight, recumbent length, head circumference, BMI, and weight-for-length from birth through 24 months. This page is built for routine term-infant WHO chart workflows and corrected-age follow-up when clinically appropriate.
Last reviewed: 2026-04-28
WHO is the usual under-2 chart
What this page calculates
The calculator uses WHO LMS data and the LMS z-score method. You can enter any available measurements, and the page calculates all matching WHO chart outputs.
- Weight-for-age, length-for-age, head-circumference-for-age, and BMI-for-age use age in months.
- Weight-for-length is independent of age and appears when weight and recumbent length are both entered.
- Percentile and z-score should be interpreted with serial trend and measurement quality.
WHO infant growth workflow
- Confirm whether the plotted age is chronological or corrected age.
- Use recumbent length, not standing height, under age 2.
- Check weight-for-length when weight and length patterns do not move together.
- Document chart source before the age-2 transition to CDC charts.
When to use another page
- CDC growth calculator 0 to 36 months for CDC infant chart-specific workflows.
- CDC growth calculator 2 to 20 years after the CDC chart transition.
- Adjusted age calculator for preterm corrected-age setup.
- Head circumference percentile calculator for a focused head-growth page.
Related calculators
References
FAQs
Yes. It uses WHO LMS data to calculate weight-for-age, length-for-age, head-circumference-for-age, BMI-for-age, and weight-for-length percentiles for ages 0 to 24 months.
WHO standards describe growth among healthy children living in conditions that support optimal growth. CDC and AAP resources recommend WHO growth tools for term infants from birth to 2 years in the United States.
Use corrected age when your preterm follow-up plan calls for it, and document whether the plotted age is chronological or corrected.
Weight-for-length and serial trend are common routine anchors under age 2. Infant BMI can be useful as a screening measure in some contexts, but there is no universal under-2 BMI category system like the CDC 2-to-20-year BMI bands.
Many U.S. workflows switch from WHO infant charts to CDC 2-to-20-year charts at age 2. Keep chart source changes visible in documentation so serial trend review is not misleading.