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Calculators
Pregnancy Due Date Calculator - When Is My Baby Due?
Pregnancy Due Date Calculator - When Is My Baby Due?
Calculate your estimated due date and current week of pregnancy
Calculators
Calculator
Reset
Last Menstrual Period
Average Cycle Length
(days)
Calculate
Reset
How to Use
1
Enter the first day of your last menstrual period
2
Optionally adjust your cycle length (default 28 days)
3
Click Calculate to see your due date and current pregnancy week
Frequently Asked Questions
How is the due date calculated?
Using Naegele's rule: add 280 days to the first day of your last menstrual period, adjusted for cycle length.
How accurate is this calculator?
Only about 5% of babies are born on their exact due date. Most are born within 1-2 weeks before or after.
What are the trimesters?
First trimester: weeks 1-12. Second trimester: weeks 13-26. Third trimester: weeks 27-40.