Dates Calculator

Calculate important pregnancy dates such as LMP, GA, and EDC, from other dates available. Select which information you have available, enter the necessary details, and the other important dates will be calculated.

If you have a first trimester ultrasound with the appropriate measurements, SOGC guidelines recommend using crown rump length (CRL) to determine the estimated date of confinement (EDC) rather than LMP or ovulation information. Consider using the 1st trimester US dating calculator in these situations.