Pregnancy Due Date Calculator

    Estimate your baby's due date

    Formula

    Due Date = Last Menstrual Period + 280 days

    Naegele's rule estimates due date as 280 days (40 weeks) from the first day of the last menstrual period.

    Examples

    LMP Jan 15, 2026

    Due date approximately October 22, 2026.

    Frequently Asked Questions

    About Pregnancy Due Date

    Estimate your baby's due date using Naegele's rule based on your last menstrual period.