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Due Date Calculator

NEW

pregnancy · due date · baby · 出産予定日 · 출산예정일

First day of last menstrual period

Average cycle length (days)

Naegele's rule (280 days) · estimate only, not medical advice.

Enter the first day of your last period to estimate your due date and current week.

Yes — completely free, no account or installation.

Naegele’s rule: last period plus 280 days, adjusted for cycle length.