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Twin Pregnancy Calculator
Get Your Due Date!

This fun twin pregnancy calculator tool will give you a good estimation of your twins due date, as well as estimated conception date and fetal age of your twins! It's always fun finding out when your babies might make their appearance, so give it a try!
Simply enter the correct information into the boxes below, then hit the "Calculate" button. You can always use your best guess if you're unsure about exact dates. 
Last Menstrual Period:                    (MM/DD/YYYY)

Average Length of Cycles:             (22 to 45 days / defaults to 28)
              
Average Luteal Phase Length:    (9 to 16 days / defaults to 14)
                




Estimated Conception:      
Estimated Due Date:           
Estimated Fetal Age:


*The estimated due date is based on twins born at 40 weeks. Keep in mind that many twin births occur before the 38th week and most doctors consider twins full term at 38 weeks.



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