Pregnancy Due Date Calculator

Enter the first day of your last menstrual period (LMP). We estimate the due date using the 40-week rule (280 days). This is a standard screening estimate; your provider may use ultrasound for a more precise EDD.

Pregnancy Due Date

First day of last menstrual period (LMP)

Estimated due date (40 weeks)

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How this is calculated

EDD = LMP + 280 days (40 weeks). We add 280 days to the date you enter and display the result. Actual delivery varies around this date.

Use this tool for

Use it for a quick estimate. Always confirm with your healthcare provider and follow their dating method.

Common questions

How do I use this utility?

Enter the required values in the form above. The result updates automatically.