How to check fetal weight by week
Fetal weight by week is described as a distribution rather than one correct number. Comparisons should use accurate gestational age and one clearly identified reference.
Use the calculatorHow to use the calculator
Enter the pregnancy week, days, and the estimated fetal weight from the ultrasound report. Before 22 weeks, the form switches from estimated fetal weight to fetal biometry measurements.
Interpolation
When the entered gestational age falls between table weeks, the calculator interpolates between neighboring rows and percentile columns.
WHO fetal growth charts
WHO references provide international fetal growth and biometry data. They are used for early checks and remain available as an international comparison.
Can I compare different references?
You can change the data source, but each result is shown against the selected reference and study population. Datasets are not mixed or combined.