Pregnancy Calendar and Due Date Calculator

Calculate your baby's due date!

Our pregnancy calendar / calculator is based on regular 28 day menstrual cycles.

An average pregnancy is 280 days from the last menstrual cycle. Obstetricians allow two weeks on either side of the estimated due date for the baby to be considered "on time".

Due Date Calculator

Not sure when your baby is due? Our handy calculator will help predict your most likely due date.

Calculate Forward

Calculate Backwards


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Date of last menstual period:
Likely conception date:
End of first trimester (12 weeks):
End of second trimester (27 weeks):
Number of weeks you have been pregnant for:
Visit Week of your pregnancy
Estimated due date (40 weeks):
Visit the

Pregnancy Weeks Calculator

Want to know how many weeks pregnant you'll be on a given date? Or on which date you'll be a certain number of weeks pregnant? Try out our pregnancy week calculator! Be sure to enter your due date first if it isn't prepopulated.

Enter Due Date

Enter Date

Enter Weeks

you will be weeks pregnant.

Get the SureBaby due date calculator for iPhone or Android!
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