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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, 4.1 out of 5 based on 71 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.

Related posts:

  1. How to Calculate a Possible Due Date
  2. Top 10 Signs of Pregnancy from Conception
  3. Fertility Calculator: Find Your Ovulation Date
  4. Conception Tips
  5. Fertility Calculator: Find Your Ovulation Date
ask
  • May

    Hi!

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  • Mary

    Hi..I have a question..I had sex on nov 1 2014..went to plannedparenthood on Monday morning to get the morning after pill..I didn’t start the birth control pill till the 14th of nov..I also didn’t take the birth control on time everynight..my due date is August 25 2015..please help when did get pregnant..?????

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  • rachel

    I hadA miscarriage December 27th I am pregnant again and due September 15th when did I conceive ?

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  • Worried

    My last period was on 16 Dec 2014, I had “breakup sex” with my lover on 23 Dec 2014 (we didn’t use protection as I thought it was the safe period being just after my period), agreeing that we wouldn’t see each other again as I wanted to exclusively be with the guy I was formally seeing. Thereafter I had sex with my boyfriend who is now my husband on 25th Dec and 31 Dec 2014, I discovered I am pregnant in end Jan and my edd given by the doc is 22 Sept 2015. My periods usually last 30 to 32 days. This worry has been hanging over my head like a death sentence. It isn’t something I am proud of, but I am 100% committed to my husband now and we are both eagerly looking forward to the arrival of our baby girl. I hope to get some reassurance from the experts here that my husband is the father of my bb girl.

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  • breeAnn

    I had unprotected sex from July 20-31 , got my period Aug 2. Had unprotected sex with an old friend on Aug 16 found out I was pregnant Sept 1, estimad due date was 5/9 .which guy would be the father?

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  • breeAnn

    The first time was with my boyfriend ***

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  • msbetty2015

    my last period was on 5/27/15. i had sex on 05/31/2015 and 06/03/2015. my ovulation date was on 06/04/2015. my next menstrual was to begin on 06/16/2015, i am currently spotting. what is my exact estimated date of conception?

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  • winnie

    hello, am a little confused right now.I had unprotected sex with my partner, now ex partner , last on April 19th 2015.I had had my period 2nd of April to 4th of April, and so i assumed my fertile window would have been 16th -22nd of April with 21st April coming up as ovulation day. I started having pregnancy symptoms last month, i vomited,had food cravings and aversion, sensitive to smell,tiredness,unexplained weight gain,bloating and my tummy seems a little grown now.However, on 5th,6th and 7th of /may i had very bright colored blood which didn’t look like normal period. I have done several urine tests and all came negative.Requested blood test from the doctor’s and it came negative.Somehow, i still feel pregnant and sometimes i get tummy tingles.This month,June 2015, i had few drops of brown blood,just like spotting, instead of my period.We were ttc and so eager to have a baby together but not together anymore. Could i still be pregnant?Is it possible that i have a low amount of hcg or the tests were wrong?I know my doctor requested me to have an ultrasound and trans-vaginal scan on 24th this month, but it seems to far to wait.Am so curious.Could i still be pregnant? P.S-am a mother to a 6 year old so i know how it feels to be pregnant and i have the feeling.

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  • 863queen

    My hcg level was 13,000 on Monday. 31,000 on Friday, doc says I’m realm early cause they only see the yolk sack. I heard hcg levels so high may be twins is this true?

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  • emily

    I had sex with a guy may 6 and got my period may 12, my periods are not always on time but im 10 weeks and 2days pregnant the Pregnancy Due date calculator said sex of getting pregnant 15-23 is my boyfriend the farther or is the other guy the dad?

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  • tiare

    Hi I’m 33 weeks pregnant. Due date September 3, 2015. I’ve been on birth control for a while and I don’t have periods to calculate anything. My ultrasound showed that my LMP was nov. 29, 2014. I’ve slept with my bf on dec.5, 2014 then left him. I messed around with another guy on dec 11, 2014. Then I moved to Washington on dec. 12, 2014. I’m still with my bf, he believes this baby is his and I believe it too. I just wanted to see other people’s opinion on who is that father?

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  • tiare

    And I also had set with my bf around 9 am on dec. 11, 2014. But I was drunk when I had set with that other guy around 4 am on dec. 11, 2014.

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  • Hannah Elaine Roberson

    So my last period was on February 13, 2015. I missed my period in March, but tested positive on March 25TH, 2015. I’ve had several ultrasounds done and they say my due date is December 8th, 2015. I was just wondering when I conceived? Should I go by my last period or my ultrasounds? I also have a 29 day cycle. I start every month on the 13th or 14th.

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  • Amanda

    What if im pregnant, but had a baby 5 months so I never got my period… how do I know how far along I am then..took a test because I was nauseated for 4 days and came back positive right away with a dark line. Now my nausea pretty much stopped. Took the test 2 weeks ago and my dr appointment is in a month… heres a picture of my stpmach hopefully it can help.

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  • kaylyn

    Interesting. I’m in the same situation

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