maratoolObstetric calculators
Pregnancy dating and obstetric calculators.
Gestational Age by LMP Calculator
Calculate gestational age and estimated due date from last menstrual period (Naegele rule).
Gestational Age by Ultrasound Calculator
Calculate gestational age and due date from ultrasound biometry.
Pregnancy Due Date Calculator
Calculate your pregnancy due date from LMP, conception date, or IVF transfer using Naegele’s rule, plus current gestational age and trimester.