Height, weight and BMI percentile charts powered by WHO standards. Designed for parents and pediatricians. Free to start.
Features
Clinical-grade tools made simple for everyday use — no medical degree required.
Weight-for-age and height-for-age charts plotted against WHO standard deviation bands — the same charts paediatricians use.
Our LMS-based calculation engine computes exact z-scores and percentile ranks for every measurement, automatically.
Linear regression predictions estimate future height and weight trends, and a mid-parental estimate shows the likely adult height range based on both parents' heights.
Generate professional PDF reports with full chart history and statistics — perfect for paediatrician visits.
Smart alerts for unusual growth changes, plus vaccination and milestone reminders.
Your child's data is stored securely with row-level access control and never sold. Full GDPR data export and deletion rights.
How it works
Add your child's weight and height. GrowChart instantly plots them on WHO standard charts, calculates z-scores, and flags any concerns.
Pricing
Start free. Upgrade when you need PDF reports, multi-child tracking, and advanced predictions.
FAQ
We use the official WHO Child Growth Standards (2006) and the WHO Growth Reference (2007) for children aged 0–19 years. The same charts used by paediatricians globally.
GrowChart is self-hosted on our own infrastructure. We use Plausible Analytics, a cookieless and privacy-friendly analytics tool, and we never sell your data. We are GDPR-aligned and you can export or delete your data at any time.
A z-score (or standard deviation score) tells you how far your child's measurement is from the WHO median for their age and sex. A z-score between -2 and +2 is considered normal.
Free accounts support 1 child. Premium accounts support up to 5 children, and Clinic Pro supports unlimited patient profiles.
Yes, you can cancel anytime from your Billing Portal. You'll retain access until the end of your current billing period.
Every paid feature is free right now while we finish billing setup. Join the list and we'll email you first when it goes live — and you'll lock in a founding-family discount.
Free Tools
Instant WHO percentiles and z-scores — no sign-up needed. Save & track when you create a free account.
Guides for Parents
Evidence-based guides on growth tracking, WHO standards and paediatric health.
Learn to read a WHO growth chart in five minutes — centile lines, SD bands, and spotting a real problem.
Typical baby weight gain month by month in the first year, what the WHO curves show, and when a dip deserves a second look.
Measure your baby's length and height accurately at home in minutes — with or without a measuring board.
Why tracking the trend beats any single percentile — and how to log measurements so the curve stays meaningful.
Newborn weight loss in the first days is normal — here's how much, why it happens, and when it needs attention.
How WHO created the global gold standard for child growth — and why it replaced country-specific charts.