Pregnancy Due Date Calculator Ireland

Pregnancy Due Date Calculator

Congratulations if you are expecting. Enter the first day of your last period to estimate your due date and how far along you are.

Last updated 10 October 2026 · Written for patients in Ireland

✓ Irish-registered GPs

✓ From €35

✓ 7 days a week

✓ Not charged until confirmed

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How your due date is worked out

A pregnancy is usually dated from the first day of your last period, and the average pregnancy lasts 40 weeks (280 days) from that date. If your cycle is longer or shorter than 28 days, the date is adjusted. Your dating scan will usually confirm or adjust it.

Next steps in Ireland

Contact your GP to confirm the pregnancy and start free maternity and infant care
Start taking folic acid if you are not already
Avoid alcohol and smoking
Tell any doctor or pharmacist that you are pregnant before taking medicines

When to get urgent help

Contact your maternity unit or call 112 or 999 straight away for heavy bleeding, severe tummy pain, a bad headache with vision changes, or if your baby’s movements slow down or stop later in pregnancy.

Frequently asked questions

How accurate is a due date calculator?

It gives the standard estimate used by doctors and midwives. Only about 1 in 20 babies arrive on their due date; most come within two weeks either side.

When will I have my first scan?

Arrangements vary by maternity unit. Your GP or maternity unit will advise.

Official sources and further reading

HSE: pregnancy and birth

This page is general information for patients in Ireland, not a diagnosis or personal medical advice. If you are worried about your health, speak to a doctor. In an emergency call 112 or 999.

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