About BabyCurve and our editorial policy
BabyCurve is an independent web calculator that makes fetal growth reference data easier to understand. It identifies sources and limitations and does not replace medical diagnosis.
Use the calculatorWhat this service provides
Enter gestational age and estimated fetal weight to compare the value with a selected reference. This page is informational and does not diagnose fetal health.
Editorial policy
Content is based on published studies and reference charts, with the source population, measurement type, scope, and limitations shown together. We do not claim clinical review by a medical professional unless it is explicitly stated.
Source and change review
When data or explanations change, we recheck the original source, publication date, measurement method, study population, and limitations. Values from different references are not mixed or combined into one diagnostic standard.
WHO, INTERGROWTH-21st, Korean, Japanese, and NICHD datasets are not mixed or combined. The calculator uses the percentile values from the selected reference only.
When the entered gestational age falls between table weeks, the calculator interpolates between neighboring rows and percentile columns.
The calculator can calculate a raw percentile, but the displayed label shows values below the 10th and above the 90th percentile as ranges.
Medical boundaries
No. The result is a reference percentile only. It does not diagnose growth restriction, macrosomia, placental function, or future outcome.
Ask your clinician to interpret the value together with the full ultrasound report, exam history, and local clinical guidance.