Free baby growth percentile calculator using WHO and CDC charts for children 0–5 years
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30-day free trial with full access, no credit card required. After trial: Plus €2.99/month for 1 loved one, or Family €8.99/month for up to 4 loved ones. Free Basic mode available after trial ends with limited access.
Key features
WHO Child Growth Standards charts for ages 0–60 months
CDC 2000 growth charts available from age 24 months
Weight, length/height, head circumference, and weight-for-length measurements
Separate growth curves for boys and girls
Corrected age calculation for premature babies born before 37 weeks
Private browser-only growth log with no server upload
Trend alert for faltering growth based on UK NICE guidance
Gain-per-day check between measurements
Works offline after initial page load
Daily "I'm OK" check-in button for loved one
Family dashboard showing check-in status
Last-known location context
Battery status information
Missed check-in alerts
Multiple caregiver coordination
"Call me" and "I need help" buttons
Consent-based setup
No route history tracking
Support for up to 6 caregivers
What makes it different
No ads, no account, no data collection—measurements never leave your browser
Official WHO LMS parameters and CDC data with published formulas shown explicitly
Handles measurement precision automatically with date-of-birth mode for young babies
Applies WHO's 0.7 cm adjustment for lying vs standing measurement method at 24 months
Cross-checked data with automated test suite validating WHO medians and clinical thresholds
Consent-first design where setup happens together with loved one's knowledge
Last-known location only, no route history or movement tracking
Large buttons and simple interface designed for older users
No paywall for active help status
Free Basic mode available after trial without payment required
BabyPercentile
KinStatus