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Pregnancy Due Date Calculator

Calculate estimated due date from last period, conception, or IVF date. Week-by-week milestones.

Default: 28 days (21-35 range)

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Frequently Asked Questions

How is the pregnancy due date calculated?+
The due date is estimated by adding 280 days (40 weeks) to the first day of your last menstrual period (LMP), which is the standard Naegele's rule.
How accurate is the due date calculator?+
It provides an estimated due date. Only about 5% of babies are born on their exact due date. Most arrive within 2 weeks before or after.
Can I calculate based on conception date?+
Yes. If you know the conception date, the tool can calculate the due date by adding 266 days (38 weeks) from that date.