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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 92 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
  5. Fertility Calculator: Find Your Ovulation Date
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  • Hannah

    I had sex with my ex on the 30th of January kinda as a rebound thing we fought and then I had sex with someone else on the 6th of february were not sure who the dad is and I’d really like some help figuring it out my last day of my last period was the 19th of January and my due date is October 25th (both men know the cercomstances) any help works, the guy on the 6th the only way possible for him would be precum on a broken condom he never finished, the guy on the 30th did

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  • gia

    Most likely it would be for the guy you had sex with on the 30th.

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  • Pk

    Hi Im pregnant approximately 6-7 weeks I continually had unprotected sex with my now ex last time was 30th June which I thought I may have been pregnant already due to lots of nausea! I then had a period which was late from 4/7 to 6/7 and shorter then usual, and had unpotected sex with someone several times over the follwing weeks! Who would the father be

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  • gia

    My last period was May 4th and I can’t remember the exact day I had sex with guy number 1 but it was several days after my period. I had sex with guy number 2 May 23rd I’m not sure who could be the father

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  • Jmp

    I don’t know when my last period was but I had sex with my now x boyfriend March 27 2016 I went to the doctor may 23 to find out I’m
    7 weeks pregnant , I’m due January 9 2017 I had sex April 18 as well as April 22-24 is the father my x from March 27th ? Or my current boyfriend

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  • Leann Bordelon

    What would be my conception date if my due date is October 26th, 2016? Some sites say January 19th and others say Feb 3rd.

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  • nate johnson

    yeah for sure, they are crazy.

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  • jev

    its so ironic the kid have a little of mt genes what you think?

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  • Deloris Porter

    I had unprotected sex with another guy on August 4, 2016. I was due my period the following week, however I didn’t see it and later took a home pregnancy. It came out positive. I saw an obgyn the next week and he stated I just got pregnant, how could that be when he said i was 5 weeks and 2 days at the time.My question is was I already pregnant before this happen or it just happened?Help, I’m so confused.

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  • Madelyn

    I had sex on Tuesday August 16th and 17th with my current boyfriend and we broke up and I had sex with my ex on the 19. The day after I felt so sick and I had white discharge coming out of me. Im,not sure what this means. Can you help?

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  • Trixie

    I need help I’m very confused. I had sex with my ex boyfriend April then he cum inside me, I had period may 11. Then we had sex again may 22 but he withdraw. then may 26 to 31 we I had sex with my current boyfriend and he cum inside every time we had contact. Now I’m 16 weeks pregnant. who will be the father?

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  • Kristine

    So i am 4 weeks says the internet. My last period was aug 4th. I had unprotected sex witg a guy aug 10 but he didny cum in me. I had sex with another aug 12 and he came in me. My ovulation date says the internet was aug 17, who is the dad?

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  • Valli Cheromcka Durkee

    which one turned out to be the dad? we are in the exact same boat.

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  • Bry

    I need help, I just found out I am pregnant Internet says I am 6 weeks and 3 days.
    I had unprotected sex with my ex Boyfriend Aug 3 which was the last day of my period was spotting after, Aug 6 and 7 had unprotected sex with a friend, Aug 8 went back with my ex bf and had unprotected sex. Please don’t judge. But who could be the dad.??

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  • tierra

    my ex boyfriend is wondering if this baby is his baby because he had sex with the girl on February 4 but he started with a condom and then he took it off and then he did not nut and then she said she was on her period so he waited to haves sex with her so then they had sex on February 14,15,16 and then he nutted in her and then she found out that she was pregnant on February 26,2016 and then she said the doctor said her due date is on October 31,2016 so I really want to know if this is his baby

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  • Nino

    I need some help I had sex with my husband may 26 and that’s the first time we met I got pregnant and my doctor told me I was 18 weeks but I don’t get it how can I be 18 weeks if I count the day I had sex it will be 16 and 3 day

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  • sheyenne

    i am only nine weeks and six days pregnant when did i concievev

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  • That girl

    I had sex July 7 and July 27 . I am now 9 weeks and 7 days pregnant . When did I get pregnant ?

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  • Tae

    I know it’s late but I need to know for my daughter’s sake. March 28,2014 was my last period. I had sex with one guy on March 3rd and another on the 14th and 27th of March. May 21,2014 is when I found out I was 7 weeks and 5 days pregnant. Due date was January 1,2015 .Which guy is the dad basically. I believe its the second guy. But could someone please give me some clarity.

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  • Tae

    I know it’s late but I need to know for my daughter’s sake. March 28,2014 was my last period. I had sex with one guy on March 3rd and another on the 14th and 27th. May 21,2014 is when I found out I was 7 weeks and 5 days pregnant. Dueel date was January 1,2015 .Which guy is the dad basically. I believe its the second guy. But could you please give me some clarity.

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  • Winterbaby

    I’ve since been to the doctor and they calculate it from you last menstrual cycle . Not when you actually had sex.

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  • Stephanie Lynn Campbell

    Ok so I have a question I started my last period on August 10 but I didn’t have sex in August at all. That being said I did have sex on September 3rd and 15th. I found out I was pregnant on the 22nd I was pregnant what would be my most possible conception date

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  • Mariah

    I’m pregnant the doctors said that I was 5 weeks and 2 days PREGNANT I’m trying to find out the date I got pregnant what’s a bad thing is I slept with my boyfriend everyday of August and end up having sex with someone else Sept 5th but he said he pulled out I’m just confused

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  • Sha 1

    All the dates match up to my boyfriend being the father

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  • Thomas Hermise

    Hello my name is Nadia Iam 22 weeks pregnant now the first day of LMP was on May 10,2016 and My OB/GYN told me my Due date will be February 14,2017 I would like to know what date in May,2016 I conceived the baby

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  • Michelle

    My estimated baby due date is 21 st October myself and my partner had intercourse on the 16 th January possible conception dates between 25 th January to 2 nd feb ovulation happened on the 29 th January which date from having sex did we fall pregnant

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  • Stephanie Jara

    I am trying to conceive and it has been almost 7 months of trying. For this month i have notice a lot of white discharge and cramping, as if i was on my period and the discharge seems as if i was to pee on myself. I was suppose to start my period on 12 of this month. I was late last month accroding to the app i use. I also get some breast pain every once while, i feel maybe it is just because it has been weeks of me stop breastfeeding. please help me understand me what is going on. ( discharge has no order)

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  • jessi

    I had unprotected sex aug 6 2016 and then got my period. August 19 2016 and had unprotected sex September 1 ,2016 and September 3,2016 and September 5,2016 and September 6,2016 when did i get pregnant. In august or in september

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  • necole

    I had my cycle September 6-10. I had sex with my ex September 10 & 11 then again September 25. I had sex with a friend September 23. who is the father pointing towards.

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  • Virgo86_B

    Can someone help me? My lmp was April 27-30th I had sex with my ex April 27th and again on May 1st. I had sex with someone else May 3rd and May 12th. I am 25 weeks and 5 days pregnant. The doctor says I conceived on May 12th and my due date is February 1st. Did I get pregnant April 27th May 1st 3rd or 12th?

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  • tiara

    if u had sex with a guy 11th of september and another guy on the 16 th of september and another guy on the 23th of september and you miss you period for october who can you be pregnant for

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  • Mrs.Priscilla Cabrera

    What if your want your baby to born on Halloween and being a first timer. When will I have to have sex? Is it around feb4-14th? My periods come around the 25th date each month because doctor has me taking provers to have my period come down. But I want a Halloween baby. Planning to in 2018. Any advice or when to have sex? Thanks!

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  • kcee

    I had sex on the 8/11/2016, just after my periods. So it possible that I might be pregnant? I did a pregnant test on the 17/11/2016 and it was negative

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  • mrwilliams

    My last period was July 14 2016 that would put my due date at April 20 2017 but when I went for my 1st ultrasound they said my date was April 12 2017 was my period still July 14 or was that implementation? Help!

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  • Monica lee

    I had sex with two guys in the same month and now I’m 18 weeks how do I know who’s the father one was on the july6 the other we had sex to many times to count but could the one on the 6 be the father at all ?

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  • Cali

    I had sex with 2 guys back to back , at different times that day . I had sex with my ex (Guy A) Saturday May 14th around 5-5:30 pm . I also had sex with Guy B around 3am which is really Sunday . May 15th . I had sex for a long time with my ex , he did came after he pulled out but idk if he pre-ejaculated . I had sex for like 2 minutes with Guy B , and we were high , so idk if he did it or not . I really want it to be my ex , he is my first love and were already on bad terms . Me and my ex continued to have sex after may 14th , we had sex june 1st , june 9th and my cycle didnt come on between those time , my cycle is irregular so i didnt know when I was ovulating , when they me my due date was March 1st , i knew it was my exs baby but when i got my sonogram last week they changed my date to february 7th this calculator says i ovulated May 17th ? wouldnt it be my exs as well since i didnt technically have sex with Guy B until 3am which is a day after the 14th , which mean i would have conceived on the 18th

    Which guy is it ??? im really scared . i only had quick sex with Guy B for 2 minutes

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  • Jessica Fipps

    If I had sex on june 3 and June 4 of 2016 and my due date is March 26 2017 does that mean it could be my ex boyfriend baby.

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  • alissa goodwin

    i had sex the day before my period 23rd of september and i got my normal heavy regular 7 day period on 24th september i then had sex the day after my period on the 30th or 1st i went to the hospital on the 14th and the did a pregnancy pee test came back negative so they gave me a xray on november 1st i found out i was pregnant on november 29th the doctor told me i was ten weeks going by my last period and due june 27
    . so my question is did i get pregnant the day before my period or did i get pregnant a couple days after my period

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