Due Date Calculator — Perinatology.com

Calculate Estimated Due Date (EDD) from LMP, Ultrasound Report, Reverse Ultrasound (EDD known), IVF/ART, or Date of Conception. After the EDD is calculated, the gestational age on a given date may be calculated at the bottom of the "Important dates & windows".

Choose a method and enter the required dates/values. Reverse Ultrasound (EDD known) returns gestational age today, calculated LMP, and estimated conception date.

Calculation method

First day of last menstrual period (LMP)

Cycle length (days)

LMP will be cycle-corrected using: corrected LMP = LMP + (cycle length − 28 days).

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Due Date & Gestational Age Calculator

Calculate Estimated Due Date (EDD) from LMP, Ultrasound Report, Reverse Ultrasound (EDD known), IVF/ART, or Date of Conception. After the EDD is calculated, the gestational age on a given date may be calculated at the bottom of the "Important dates & windows".