When I'm Due Date?

James H. Sterling
James H. Sterling
• • 7 min read

First Day of Your Last Period the Most Common Way to Calculate Your Pregnancy Due Date Is by Counting 40 Weeks from the First Day of Your Last Menstrual Period...

When I'm Due Date?

First day of your last period
The most common way to calculate your pregnancy due date is by counting 40 weeks from the first day of your last menstrual period (LMP). And that's how most healthcare providers do it.

How will I know my due date?

An estimated due date can be calculated by following steps 1 through 3:
  1. First, determine the first day of your last menstrual period.
  2. Next, count back 3 calendar months from that date.
  3. Lastly, add 1 year and 7 days to that date.

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How do I calculate my pregnancy?

Last menstrual period (LMP): Pregnancy normally lasts about 40 weeks from the first day of your last period. Accordingly, the number of weeks that have passed since indicate what week of pregnancy you're in. To work out your likely due date, count 280 days (40 weeks) from the first day of your last period.

James H. Sterling

James H. Sterling

Environmental Science & Climate Journalist
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James Sterling reports on renewable energy developments, climate policy, ecological conservation, and green tech innovations around the globe.