Rotunda Due Date Calculator – Accurate Pregnancy Due Date Estimator (Ireland)
Planning for your baby’s arrival starts with knowing your estimated due date. Our Rotunda Due Date Calculator is an easy and reliable tool designed for expectant Parents in Ireland who want a quick and accurate way to estimate their EDD (Estimated Due Date) using the same method used in the Rotunda Hospital Dublin and other maternity hospitals worldwide.
This calculator helps you find out when your baby is likely to arrive, track your pregnancy week-by-week, and prepare confidently for labour, delivery, and maternity appointments.
Planning your pregnancy journey? You may also find our Gestational Age Calculator, Conception Date Calculator, and Maternity Leave Calculator Ireland helpful. For more tools like this, explore our Pregnancy & Health Calculators section.
What Is the Rotunda Due Date Calculator?
The Rotunda Due Date Calculator is a pregnancy tool that estimates your baby’s expected arrival date based on the LMP (Last Menstrual Period).
It uses the standard 40-week pregnancy formula, the same method used by the Rotunda Maternity Hospital, midwives, obstetricians, and pregnancy clinics across Ireland.
This tool is especially helpful for women attending antenatal care in Ireland who want a fast, accurate, and medical-grade due date estimate without visiting a hospital.
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How to Use the Due Date Calculator
Using the calculator is simple and takes less than 5 seconds:
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Select the first day of your last menstrual period (LMP).
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Click “Calculate Due Date.”
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The tool instantly displays your Estimated Due Date (EDD).
No medical knowledge needed — the tool does all the calculations for you.
How the Due Date Calculation Works
The calculator uses Naegele’s Rule, the standard method used by obstetricians:
EDD = LMP + 280 days (40 weeks)
Here’s what happens behind the scenes:
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The tool takes the date of your LMP
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Adds 40 weeks / 280 days
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Generates an accurate estimate of when your baby is likely to be born
This is the same process used in:
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Rotunda Maternity Hospital
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National Maternity Hospital (NMH)
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Coombe Women & Infants University Hospital
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All antenatal care centres in Ireland
The calculation is reliable for most women with regular menstrual cycles.
Why Use This Rotunda Due Date Calculator?
✔ Accurate & Medical-Standard
Uses the same due date formula used in Irish hospitals and antenatal clinics.
✔ Free, Instant & Easy to Use
No sign-up, no medical jargon — just pick a date and get your results instantly.
✔ Perfect for Expectant Mothers in Ireland
Designed for Irish pregnancy timelines, maternity leave planning, and hospital appointments.
✔ Helps You Plan Ahead
Knowing your due date helps with:
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Booking maternity visits
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Planning scans and check-ups
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Maternity leave & workplace arrangements
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Preparing for labour and delivery
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Creating a pregnancy timeline
✔ Reliable Pregnancy Tracking
You can also calculate:
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Gestational age
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Conception date (approx.)
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Week-by-week pregnancy milestones
Frequently Asked Questions (FAQ)
1. What is the Rotunda Due Date Calculator?
It’s an online pregnancy calculator that estimates your baby’s due date using the first day of your last period. It follows the same method used by the Rotunda Hospital Dublin and Irish maternity units.
2. How accurate is the Rotunda Due Date Calculator?
The estimate is medically reliable, but the actual delivery date can vary. Most babies are born between 37 and 42 weeks, so the calculator gives a close estimate — not a guaranteed date.
3. How does the calculator determine the due date?
It adds 280 days (40 weeks) to the LMP to calculate your EDD using Naegele’s Rule.
4. Can I use this if I don’t remember my LMP?
If you’re unsure about your cycle dates, an early ultrasound scan at the Rotunda or any maternity hospital in Ireland can provide an accurate dating scan.
5. Does this calculator work for irregular cycles?
It works for most people, but if your cycles are irregular, the due date may vary. Ultrasound scans are more accurate in such cases.