Due Date

280 days or 40 weeks is the usual duration of a pregnancy...  To determine you due date firstly work out the first day of your last period and count forward 9 months and 1 week from that date.

To assist you we have a chart below that you can use (Scroll Down to View).
1.  Determine the first day of your last period and find that day in the yellow rows with blue text.
2.  Then you will find a date immediately below in the blue row with white text.
(Example:  If Jan 1 was the first day of your last period - then your approximate due date would be Oct 8.)