Fetal Weight Percentile
Compare baby's estimated weight to fetuses at same gestational age. <10th SGA, 10-90th AGA, >90th LGA.
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<10th SGA 10-90th AGA >90th LGA
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Why: Growth percentiles identify SGA/IUGR or LGA. Serial measurements track trajectory.
How: Enter EFW and GA. Z-score and percentile from Hadlock/Intergrowth-21st standards.
Run the calculator when you are ready.
📊 Normal 28 Weeks
Third trimester - normal growth
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👶 Normal 36 Weeks
Late pregnancy assessment
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⚠️ SGA Concern
Below 10th percentile
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📈 Large Baby
Above 90th percentile
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🎯 Full Term
40 weeks assessment
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Enter Ultrasound Data
For informational purposes only — not medical advice. Consult a healthcare professional before acting on results.
🏥 Health Facts
±15% ultrasound error
— Obstetrics
Serial > single
— Growth monitoring
Understanding Fetal Growth Percentiles
Growth percentiles compare your baby's weight to other babies at the same gestational age. The 50th percentile means your baby weighs the same as the average, while percentiles above or below indicate larger or smaller size.
SGA (<10th)
Small for Gestational Age
- • May indicate growth restriction
- • Requires additional monitoring
- • Multiple causes possible
AGA (10-90th)
Appropriate for Gestational Age
- • Normal growth range
- • Routine monitoring
- • Majority of babies
LGA (>90th)
Large for Gestational Age
- • Check for diabetes
- • Monitor for macrosomia
- • Delivery planning needed
Why Percentiles Matter
Growth Monitoring
Track baby's development over time
Early Detection
Identify potential concerns early
Delivery Planning
Inform decisions about delivery
Risk Assessment
Guide additional testing if needed
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