Pregnancy Due Date Calculator
Enter the first day of your last period to see your estimated due date, how many weeks pregnant you are and your trimester.
Calculator
Weeks pregnant
10 weeks 0 days
Trimester
First
Estimated due date
May 10, 2027
Days to go
210
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Formula
Due date = LMP + 280 days (Naegele's rule)Frequently Asked Questions
How is the due date calculated?
Naegele's rule adds 280 days (40 weeks) to the first day of your last menstrual period.
How accurate is a due date?
Only about 5% of babies arrive on their exact due date. Your doctor's ultrasound dating is more precise.