How Doctors Date Pregnancies, Explained



Methods for Estimating the Due Date

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This calculator gives you two options for estimating EDD estimated date of delivery. Input any parameters to compare the two date calculations. The Current Date is set to your local workstation date. Gestational Age by LMP is calculated from the first day of the last menstrual period. EDD by LMP is calculated by adding days 40 weeks to the first day of the last menstrual period.

Gestational Age by US is measured by ultrasound US on the Ultrasound Date. EDD by US is the estimated date of delivery based on the Gestational Age by US and the Ultrasound Date. Mul T, Mongelli M, Gardosi J. A comparative analysis of second-trimester ultrasound dating formulae in pregnancies conceived with artificial reproductive techniques. Westerway SC, Davison A, Cowell S. Aust N Z J Obstet Gynaecol.

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EDD EXPECTED DATE OF DELIVERY