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Brand New Dad » Cool Tools » Pregnancy Calculator

Use this calculator to determine your partner's due date. To figure out when you'll actually be an official new dad, enter the date of your partner's last menstrual period.

If you know your partner's average cycle length you can also enter it below, otherwise leave it blank and it will default to the average of 28 days.

If you know your partner's luteal phase (a term used to describe the time period that's calculated from the day after ovulation and runs through the remainder of a monthly cycle) you can also enter it below. Otherwise leave it blank and it will default to the average of 14 days.

Don't know any of these things? Ask your partner to fill it out for you...

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)

Estimated Conception:
Estimated Due Date:
Estimated Fetal Age:

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