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How to Calculate Conception Date

on Oct 24, 2012

by Lindsey Zaldivar

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How to Calculate Conception Date

How do you find out the day you conceived? Find out how to do the math and figure it out here.

When you find out that you’re pregnant, naturally the first thing you want to know is your due date! That is completely normal, since that is the exciting day that you will get to meet your little one! However, your next question might be what day you conceived. It sounds pretty simple right? Your conception date will be the day you had sex, right? Not so fast… Remember that sperm can live in the body for up to five days, so the day you had sex is not necessarily the date you conceived. Let’s explain how to figure out the date you conceived. Claim Your 20 Free Pregnancy Tests – Click Here

Figuring out your date of conception

If you have already been to the doctor, and know your expected due date, figuring out your date of conception is quick and easy! All you need to do is start with your due date, and count back 266 days. Simple as that! If that sounds like too much work to you, there are also a ton of online conception/due date calculators that will do all the work for you. So, if you know your due date already, it is a snap to figure out your date of conception. However, if you have not seen a doctor yet, and are trying to figure out your date of conception, it might be a little bit harder to figure out. If you have already been charting your cycles for ovulation purposes, figuring out your date of conception might be a bit easier. If you know when you ovulate, you know that your egg must be fertilized within 24 hours of ovulation, so that can narrow it down quite a bit for you.

Do the math!

However, this is how to determine an estimated date of conception if you haven’t been tracking your cycles. First of all, determine the date that you started your last period, and mark it down, if you haven’t already. Then add eleven days to the date your last period started. This is the first day that it was possible for you to conceive. Now, add another ten days to the first day that conception was possible. Those ten days are the days that it is possible for you to have conceived. You will have to narrow it down within those ten days to determine what your actual date of conception was.

Remember: conception dates are just estimates

Keep in mind, that just like due dates, conception dates are usually just estimates. You can sometimes pinpoint the exact date that you conceived, but not always. At least knowing your estimated date of conception will give you a better idea of when you conceived. As always, keep in mind that even if you do know your date of conception and your due date, it is no guarantee of when your baby will arrive. Babies come whenever they decide it’s time!

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How to Calculate Conception Date, 4.5 out of 5 based on 45 ratings

Lindsey lives in Roselle, Illinois with her husband and son Harry. In between keeping up with a busy toddler, she enjoys blogging about parenting, cooking, crafting at The Accidental Wallflower.

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  3. Fertility Calculator: Find Your Ovulation Date
  4. Conception Tips
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  • megan

    I just found out that I’m 4weeks pregnant and its been 2-3 weeks since my last ovulation, is there any way I could find out what day would I have gotten pregnant exactly?

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  • nicki1

    My due dates tge 6th october 2014 im really confused on when I conceived im 26 weeks 2 days

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  • Tammy walker

    My due date calculating from my last period is December 2,2014 an from the ultra sound December 4, 2014 which days did I concieve

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  • liyah

    Can you get a positive Home pregnancy test 8 days after unprotected sex?

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  • chelsea

    How long does it take for hCG to be present in urine?

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  • marie

    The last time I had sex with my ex was april 19. I conceived between may 1st and 6th based on my due date. My boyfriend doesnt believe its his. Is it possible the baby could by my exes

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  • smells

    hi licia i have a quick question

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  • MommyKe

    I’m 6 weeks and 4 days pregnant as of today July 23. So why don’t I just count back 6 weeks & 4 days (which would land on June 7) to determine the day I got pregnant? Wouldn’t that mean I got pregnant 6 weeks and 4 days ago (so on June 7 I got pregnant)

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  • MommyKe

    Oh and I’m due March 14, 2015

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