This version was machine-translated from German and has not been medically reviewed. The authoritative version is the German version.
Day of life (DOL) and chronological age
Day of life and exact age from date of birth and examination date
About this calculator
Calculates the day of life (birthday = day 1) and the chronological age in days, weeks and months from the date of birth and date of examination.
Frequently asked questions
Day of life (DOL) and chronological age: What does this calculator compute?
Calculates the day of life (birthday = day 1) and the chronological age in days, weeks and months from the date of birth and date of examination.
Day of life (DOL) and chronological age: Which sources is this calculator based on?
Naegele FC; Loytved CAL, Fleming V (ZHAW): Textbook of Obstetrics for Midwives, edition 7, Heidelberg: Mohr 1847, p. 89–90 – cited from Loytved CAL, Fleming V: Naegele's rule revisited (Sexual & Reproductive Healthcare 8:100–101, 2016) (2016); American College of Obstetricians and Gynecologists, American Institute of Ultrasound in Medicine, Society for Maternal–Fetal Medicine: Methods for Estimating the Due Date. Committee Opinion No. 700 (Obstet Gynecol 129:e150–e154) (2017); DGGG, OEGGG, SGGG: S2k guideline Induction of labor (AWMF register number 015-088), as of 12/2020 with addendum 04/2021, version 1.1 – Section on indications for induction of labor, p. 29 (2021); DEGUM, ÖGUM, SGUMGG, DGGG, ÖGG et al.: S2e guideline First-trimester diagnostics and therapy @ 11–13+6 weeks of gestation (AWMF register number 085-002), as of 07/2025 – Recommendation 4.1 (dating by crown-rump length) (2025)