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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, 4.0 out of 5 based on 63 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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  4. Conception Tips
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  • jessica

    If my husbands ex had her baby june 26 but was ue july 3rd through the 13th they last had sex sep 26 could it be his?

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  • Damara

    Hi you guys my name is Damara, I’m kind of new to this site and in need of help. Ok my last menstrual period was on December 9, 2014. I had sex on day 3 of my cycle, then it went off that same day and I spotted the next day . Ovulation from December 20, 2014 -December 24, 2014. My cycle was due on January 5, 2015 and today is January 20,2015 and still no cycle. I took a pregnancy test and it was faint positive but then the line disappeared . What could this be ? Also, few days after intercourse, I became dehydrated had cold sweats night sweats nausea fatigue jittery help me plz

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  • jes

    If my due date is September 3,2015 when did I conceive?

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  • Emily Pickett

    Hello , I’m 9 weeks today . Me and my husband was going through a separation . And I had sex with my husband first then the next day a dude I know . And the conception calculator is saying that was week I got pregnant . My big question is can the baby be my husband since we had sex first . Or can it be the other dude . Please leave negative comments to yourself.

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  • Ashlynn

    I’m having the same exact problem!! I’m 10 weeks I’m so worried I just want to enjoy my pregnancy and I feel like I can’t :(

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  • Ashlynn

    Hello so I went to an appt today and my due date is aug 17 I’ve been having sex with my boyfriend but I slept with someone else nov 28 it only happend once .. Can someone please help I’m so worried it’s not my boyfriends baby!

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  • Lailah

    If I had sex with my boyfriend on August 29 than what is my due date?

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  • Tekila Walker

    It saying that my ovulation date was jan the 12 and that my conception was between jan 8 thur the 16 but which day to be exact was my baby made on my period was dec the 29 2014

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  • Riri

    My due date is 7-25-15 when did I get pregnant because I don’t know who the father is?? Please help

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  • Lindelwa Mpeta

    My last periods was on the 11th of july 2014, me and my boyfriend had sex on the 18th july. when did I conceive and when is my due date?

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  • Samantha

    Are women more likely to concieve from sperm that is 5 days old, or sperm that is 3 days old. For example, my boyfriend and I had sex on August 22, 2013 and on August 27, 28, 29, 2015 I am now due with a baby girl on May 23rd, 2015.

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  • Mharge

    I have some question !!
    May period is late 7days
    And my pregnancy test is negative
    And after a while I have bleeding but not longer 48hrs
    Like a normal menstruals period!! But not longer
    And after 3 days when my period is done
    I saw my underwear have a brown discharge
    And earlier after I saw that discharge I fell my lower abdominal has cramps but lightly and I fell my lower viginal have a lightning bolt what it means??
    Pleas help me

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  • lucymommy

    Can u get pregnant if your ovulation day was on the 5th and u had sex on the 6th?

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  • coco88

    I had sex September14,2014 and they said my due date is june14,2015 so when is the the day i concieved?

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  • Diana

    Hi my due date is april 9. I got pregnant right after a misscariage , due to the fact that i got pregnant right away without having my period i dont know what day i conceived.

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  • keyshakeysha

    What’s my date of conception if my due date was may 29, 2013?

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  • arebayona morrow

    I had took an ovulation test on November 4th and it came out positive, I took a pregnancy test on November 17 and it came out positive, I went on December 16 to get a dating done and I was 8 weeks pregnant on the dot…BUT I do not remember when my last period was which is killing me..I need help! Anybody??

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  • briana

    Is it more likley to get pregnant 1- 2 days before you ovulate because the sperm is already waiting for the egg or is it more likley to get pregnant the day of ovulation even if the sperm from 2 days before is still there waiting for the egg?

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  • Hilary

    If my due date was predicted to be 8/25 could I have conceived BEFORE DECEMBER 25

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  • wendy

    My due date is April 12 when did I conceived

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  • wendy

    Tell him that if you don’t want to be with me at lease be there for your daughter if he’s not then take his as to court

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  • Cheryl

    My last period was January 16th 2015 and I was curious how far along I am???

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  • Mike

    If my girlfriend had miscarriage on April 20 2014 we had sex April 26 27 may2 2014 and she said she had sex with someone else on May 7 2014 and her due date was February 1 2015 but she went in on February 4 2015 who would b tha father

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  • Pauline

    I just found out that I’m pregnant today. My period is ALWAYS on time and is very regular. I get it anywhere between the 1st and the 4th of each month. I just recently started seeing someone new about a month ago. We’ve only had sex 3 times. The first time was on March 3rd. We did it briefly (about 30 seconds) without a condom, but then he put one on. He also didn’t even ejaculate that night. We did the same thing on that following Friday (March 6th). He ejaculated that time but had a condom on. The last person I slept with before him was an ex and that was back in the middle of February. I know we didn’t use a condom. We were a bit intoxicated though so I’m not sure if he came inside of me or not. My question is (before I stir up any unnecessary drama) is there a possibly that I could have gotten pregnant from precum on the March 3rd (a day or two from when I always have my period)? I feel like it would be pretty impossible considering I wouldn’t have been ovulating a day or two near when I get my period and also because he didn’t ejaculate inside of me. Any and all help would be much appreciated.

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  • cheo

    I have been with my recent boyfriend for over a year and last year in September 2nd I had a one night stand with an ex. my due date now is June 1st 2015 is it possible that the baby is from the one night stand??

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  • JessieCa Moore

    Hi I cant remember the day I started my last period but I remember the day it ended abd that was February 14 I had unprotected sex the next day it is now March 24 and I still have not had my period is there a possibility I can be pregnant?

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  • amy

    hay, I had a one night stand on the 14th febuary when me andmy boyfriend had an argument. When i work out my ovulation and when i conceived it works out the 10th febuary? i need help im so worried

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  • INGODSHANDS

    I NEED HELP!!! PLEASE…

    SO MY LAST TWO PERIODS WERE 01/16/2015 – 01/20/2015 AND 02/16/2015 – 02/20/2015.
    I WAS SLEEPING WITH MY BOYFRIEND UP TO 03/02/2015 AND WE BROKE UP I SLEPT WITH SOMEONE DIFFERENT THE MORNING OF 03/07/2015. WHEN WOULD I HAVE CONCIEVED? WHO IS THE BABIES FATHER? MY BOYFRIEND GOT ME PREGNANT ONCE BEFORE IF THAT MATTERS.

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  • Nervous Wreck

    Hi, I just have a quick question.. I had unprotected sex on March, 5th 2015 I am now two days late on my period, I did a calculation thing that says IF I’m pregnant I would have conceived on March, 15th 2015 but this isn’t possible right?? All the research I’ve did says sperm is basically LUCKY to live for 7 days.. I’m honestly just nervous..

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  • Sarah

    I had sex on Dec 5 2014 and now I’m pregnant its March 27 2015 how many weeks pregnant am I ?

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  • katy803

    I consived april 11 tru 13 and then the 21 i consived wit my ex my lmp was april 1 or march 28 but according to my doc my due date was jan 08 but they did a c section on dec 25(it was programd) so who is the dad?

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