How accurate is this?

Only about 5% of babies are born on their due date. Most arrive within 2 weeks before or after.

Pregnancy Due Date Calculator

Estimate your baby's due date

Last Period Year

Last Period Month

Last Period Day

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.

Due date approximately October 22, 2026.

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

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