This version was machine-translated from German and has not been medically reviewed. The authoritative version is the German version.
Gestational age
5 calculators · due date, last menstrual period, PMA, day of life, corrected age, ROP screening
This category contains calculators for time and age data related to pregnancy and preterm birth. The Gestational Age calculator derives all remaining values from two known ones, including estimated due date, postmenstrual age, day of life, and chronological and corrected age. There are also separate calculators for postmenstrual age (PMA), day of life (DOL), conversion between due date and last menstrual period, and the date of the first screening for retinopathy of prematurity according to AAP 2018. Each calculator states its formula and sources.
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Gestational age calculator
EDD, last menstrual period, birth, GA at birth → PMA, day of life, chronological and corrected age -
Postmenstrual age (PMA)
Gestational age at birth + chronological age -
Day of life (DOL) and chronological age
Day of life and exact age from date of birth and examination date -
Estimated due date (EDD) and last menstrual period (LMP)
Convert due date, last menstrual period and gestational age at birth into one another -
ROP screening date
First examination for retinopathy of prematurity according to AAP 2018
Frequently asked questions
How do I calculate postmenstrual age?
The Postmenstrual Age (PMA) calculator computes it from the gestational age at birth and the age in days of life. It additionally outputs day of life, chronological age and corrected age. The Gestational Age calculator also derives it from the due date or last menstrual period.
When is the first ROP examination due in preterm infants?
The ROP Screening Date calculator determines the date according to the AAP recommendation 2018: 31 weeks postmenstrual age or 4 weeks after birth, whichever is later. It is based on gestational age and date of birth.
How do I calculate the estimated due date from the last menstrual period?
The Estimated Due Date (EDD) and Last Menstrual Period (LMP) calculator sets the due date 280 days after the last menstrual period. It converts due date, last menstrual period and gestational age at birth into one another; a back-calculated LMP equivalent does not necessarily correspond to the actual last menstrual period.