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Due Date Calculator

Sometimes calculating your due date is confusing! Use this handy due date calculator* to get the right date based on your real cycle length (even if you have a longer cycle than 28 days). Don't forget to also read some of our "did you know?" information on cycle length and due date calculation!

Last Menstrual Period:        
                              (MM/DD/YYYY format)

Average Length of Cycles:      (22 to 45)
                              (defaults to 28)

Average Luteal Phase Length:   (9 to 16)
                              (defaults to 14)

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Estimated Conception:         
Estimated Due Date:
Estimated Fetal Age:

* Free JavaScripts provided
by The JavaScript Source

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