How your baby is developing
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Work back from your due date
To calculate the expected date of delivery of your baby and how many weeks pregnant you are , please enter the first day of your last period using the drop down menu. Click on the calculate button.
YOU WILL NEED TO DO THIS BEFORE YOU DO ANY OTHER CALCULATIONS ON THIS PAGE .
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To know how pregnant you are at a future date please enter that date using the drop down menu
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To know the date when you will be any given number of weeks pregnant please enter the number of weeks and days pregnant you will be
weeks
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days
Please note that this calculator works on the principle of adding 280 days( 40 weeks) to the first day of your last period. Some doctors and midwives may come up with a slightly different date and remember that babies do not always come on the due calculated day.