What is the due date if the last menstrual period was May 20, 2026?
February 24, 2027
Current Time
What timezone are the calculations shown in?
All calculations are performed and displayed in Vancouver time (America/Vancouver). You can easily switch to any other timezone using our timezone selector.
How accurate are the date calculations?
Our calculations are 100% accurate and account for leap years, different month lengths, daylight saving time changes, and historical calendar transitions.
How accurate are pregnancy due date calculations?
Our calculator uses the standard 280-day (40-week) pregnancy duration from the last menstrual period. Only about 5% of babies are born exactly on their due date, with most births occurring within 2 weeks before or after.
What method does the calculator use?
We use Naegele's Rule, adding 280 days (40 weeks) to the first day of your last menstrual period. This is the same method used by most healthcare providers worldwide.
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