How to Calculate Birth Time

Eighty percent of expectant mothers give birth within two weeks of their birth time, or due date. If you want to figure out your due date but haven't had your first doctor's appointment yet, there is an easy way to calculate it. Once you know your due date, you can go ahead with planning and preparation for the arrival of your little one. Go shopping for seasonal clothes or get started on decorating the nursery.

Things You'll Need

• Calendar

Show More

Instructions

• 1

  Determine the date of the first day of your last period.

• 2

  Count backwards three months; this is the month in which you will deliver.

• 3

  Add seven to the date of the first day of your last period.

• 4

  Combine the month from step 2 and and date from step 3. This is your due date.