How it works
Enter the first day of your last menstrual period and your average cycle length to get an estimated due date, how many weeks pregnant you are today, and a likely conception date, using the standard Naegele's rule method.
Pregnancy Due Date Calculator
Estimate your due date and how many weeks pregnant you are today.
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Estimated due date
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Weeks pregnant today
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Estimated conception date
For informational purposes only — not professional advice.
FAQ
How accurate is this estimate?
It's an estimate based on average cycle timing, the same method many midwives and doctors use as a starting point — only around 5% of babies actually arrive on their exact estimated due date, so treat it as a helpful guide, not a guarantee.
Is this medical advice?
No — this tool is for general information only. Always confirm dates and monitor your pregnancy with a qualified healthcare provider.
What if I don't remember my last period date exactly?
Use your best estimate — being off by a few days only shifts the estimate slightly. An ultrasound dating scan gives a more precise result if you need exact dates.