The spreadsheet is used to help users confirm the results. Percentile Range Spreadsheetįetal Growth Calculator Percentile Range (PDF 1.55 MB) If the input is not within the expected range, the results will be displayed based on the values of the inputted data. You may need to scroll down to view the results table. After the Submit button is clicked, information for EFW will appear below it. To estimate fetal weight, enter information below, and select the “Submit” button. Definitions of the measurements used for the EFW calculator are available, as are ranges for the measurements (spreadsheet linked below). Users should keep in mind that factors beyond those used to calculate EFW may affect an infant's birth weight. Unlike other estimation methods, the NICHD EFW calculator results take the mother's self-identified race/ethnicity into account, a critical issue following the Study’s findings that EFW percentiles could be incorrect for non-white fetuses if a single growth standard is used. Depending on the ultrasound measurements included, the calculator can provide four estimates of EFW percentiles.
This calculator uses data from the NICHD Fetal Growth Study to calculate Estimated Fetal Weight (EFW) for a singleton (one) fetus between 10 weeks 0 days and 41 weeks 6 days of pregnancy. The NICHD Fetal Growth Study, started in 2009, aims to set evidence-based standards for normal fetal growth and size for each stage of pregnancy. Normal fetal growth is important not only for a healthy pregnancy, but also for ensuring health and well-being throughout childhood and adolescence.
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