How are the weeks calculated?

The 40 weeks are counted back from the due date you enter, so week 40 ends on that date and week 1 begins 279 days before it.

Which weeks belong to each trimester?

The calendar bands weeks 1 to 13 as the first trimester, 14 to 27 as the second, and 28 to 40 as the third.

No. This is a printable planning sheet based on the due date you enter. Your midwife or doctor is the authority on your dates and care.

Create a printable 40-week pregnancy countdown calendar from your due date, showing the start date of every week and the three trimesters.

Year

Month

Week Starts On

Paper Size

Click "Generate Calendar" to create your calendar.

Enter your due date. The generator counts the 40 weeks back from it, so week 40 ends on the due date, and shows the calendar date each week begins.

Print it and mark off each week as it passes. The trimesters are color-banded so you can see at a glance where you are in the pregnancy.

How are the weeks calculated?: The 40 weeks are counted back from the due date you enter, so week 40 ends on that date and week 1 begins 279 days before it.
Which weeks belong to each trimester?: The calendar bands weeks 1 to 13 as the first trimester, 14 to 27 as the second, and 28 to 40 as the third.
Is this medical advice?: No. This is a printable planning sheet based on the due date you enter. Your midwife or doctor is the authority on your dates and care.