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ObstetriCalc is designed to provide a set of pregnancy key dates. It is the only obstetrical wheel that allows for defining your own date or date range (e.g., LMP+3Weeks+2days, or Conception + 20weeks). A special interface dedicated to an easy definition of dates allows for daily and intensive use. The key data to be defined or calculated are:
•The last menstrual period,
•The conception date,
•The due date,
•The embryo length at a given date,
•The gestational age at a given date.
The embryo length or the gestational age could therefore be defined by using previous ultrasound measure.

At any time a set of consistent data (dates, gestational age or embryo length) is proposed, the reference data being outlined with a blue star.

A large calendar allows for a global view of all user-defined dates.

ObstetriCalc is highly adaptable through the definition of additional dates (or date range) that are defined by adding days or weeks to one of the previous reference date (LMP, due date, conception date).