Pregnancy Due Date Calculator
Estimate a due date from the last period, conception or IVF transfer.
Estimated due date
About the Pregnancy Due Date Calculator
Based on Naegele's rule — 280 days from the first day of the last period — with an adjustment for cycles that are longer or shorter than 28 days. Conception and IVF transfer dates are supported too.
You also get how far along you are now, the trimester, and the key milestone dates through the pregnancy.
Frequently asked questions
How accurate is a due date?
Only about 4% of babies arrive on their exact due date. Most births happen within two weeks either side, and a dating scan in the first trimester is more accurate than any calculation.
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