Due Date Calculator

Estimate your pregnancy due date and current week of pregnancy based on last period or conception date. Free, no signup.

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Frequently asked questions

How is due date calculated?
Naegele's rule: 280 days (40 weeks) added to first day of LMP. Conception date subtracts 14 days first.
Why different from doctor?
Doctors refine with ultrasound. This uses LMP-based math only.
Medical advice?
No. For general information only. Confirm with qualified healthcare provider.