The standard method used by Irish GPs and maternity hospitals. Adds 280 days (40 weeks) to the first day of your last period, assuming a 28-day cycle.
If your cycle is longer or shorter than 28 days, we adjust the due date accordingly. A 35-day cycle pushes the due date 7 days later than the standard calculation.
Your GP will refer you for a dating scan at 10–14 weeks. This is the most accurate way to confirm your due date and is free under the Irish maternity care system.
Irish Tip: Register with your maternity hospital early
As soon as you get a positive pregnancy test, contact your GP. They will refer you to your local maternity hospital — the Rotunda, Coombe, National Maternity Hospital (Dublin), Cork University Maternity Hospital, or University Hospital Galway. Early registration is essential to secure your booking.