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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, 4.2 out of 5 based on 58 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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  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
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  • conrad

    you and my ex are basically on the same boat so if you dont mine who is the baby daddy?

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  • Marissa

    My Friend Had Sex with Someone July 4th then Started Her Period on The 6th or 7th.. Is There Anyway that its Possible for Her To Be Pregnant By That Guy?

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  • Marissa

    You Base Your Due Date Off The First Day of Your Last Period.. And they say its 9 Months From then.. Its Actually 9 Months and 6 Days or 40 Weeks. So if You Started on March 1st (For Example) Your Due Date would Be December 7th

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  • Marissa

    You are 7 Weeks Today (November 5th) And Should have Conceived between September 28th and October 8th

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  • Marissa

    Most Likely Sometime Between June 21st and July 1st

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  • Marissa

    It Doesnt go Off Of The First Day of Your First Missed Period.. Its The First Day of The Last Period You Did Have. When was that? Once You know You Add 11 Days and That will be The First Possible Day then add 10 more and those Ten Days are The Possible Days You Could of concieved

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  • Marissa

    Most Likely Between August 8th and 18th

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  • Marissa

    Between February 23rd and March 5th

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  • Marissa

    Yes.. The One You Slept with on The 25th is The Father

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  • Marissa

    Im Pretty Sure Your Due Date Should Be January 25th. And The One You Slept with on The 20th would be The Father

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  • Marissa

    You Most Likely Concieved Between August 13th and 23rd

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  • Marissa

    You could have Concieved Between January 29th and February 8th

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  • Marissa

    Between June 2nd and 12th

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  • Marissa

    Yes You Add 11 Days to The FIRST Day of your Last Period and Thats The 1st Day Possible to Concieve then Add 10 More and those 10 Days its Possible

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  • Marissa

    Between July 6th and 16th

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  • Marissa

    Between July 22nd and August 1st

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  • Marissa

    Was That The First or Last Day?? Because Based on Your Period You Should have Concieved between April 8th and 18th

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  • Marissa

    Did Your Last Period Start on February 10th?? Cause thats What Your Due Date Implies.. If So You Should have Concieved Between February 21st and March 3rd

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  • Marissa

    The one you Had Sex With on 4/1-4/6 would be The Father

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  • Marissa

    Between February 27th and March 9th. Sperm CanLive inside you for Up to 5 Days

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  • Marissa

    You would of Concieved Between March 13th and 23rd

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  • Marissa

    After.. You Would be Pregnant Since Between March 6th and 16th

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  • Marissa

    The One You Slept with after Your Last Period

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  • Marissa

    Between April 5th and 15th

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  • Marissa

    Between March 24th and April 3rd

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  • Marissa

    Id Say More like September 13th But Ya

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  • Marissa

    You would of Concieved Between The 17th and 27th.. So no way to Know For Sure. Other than Paternity Test In My Opinion I Would Think The 2nd Guy tho

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  • Kiana Stanback

    My due date is January 3rd

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  • Marissa

    Yes.. Most Likely Between April 9th and 19th

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  • Kiana Stanback

    So if I had sex April 7th that person I had sex with is my child’s father?

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  • Marissa

    Unless You had Sex with a Different Person around the same Time Then Yes

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  • genesis moneghan

    My Lmp was march 17th. My due date is dec22.

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  • Itsme

    I am in need of some help I am looking to know when i conceived the first day of my last period was Oct 6 and I am now pregnant my Dr says I would be a little over 5 weeks now I’m looking to find the time frame I would of conceived I want to make sure it couldn’t of been on the 28th. Please help thanks

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  • Journey

    Hey could you help me? My due date is March 13, 2015. I had sex with an old friend June 1, 2014. He didn’t ejaculate at all. Then me and my boyfriend got back together and I had sex with him June 10, 2014. I came on my period the very next day which was June 11, 2014. And after my period I continued to have sex with my boyfriend I just hope there isn’t a chance of my old friend being the father. What is your opinion?

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  • cecilia

    I came on my period on September 28 and i had sex with guy a the week of the 7th and had sex with guy b on the 16th which one is the father and when did i conceive…. please help

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  • Ashley

    I had unprotected sex with the guy im currently with on october 18. My period was suppose to start on the 30 but it never did. I took two tests and they said im pregnant. Was this the day i conceived??

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  • Michelle Eddie Pereira

    Hi my last period 1st day was 10th April 2014 ..cycle 28 days
    base on it what will my baby gender be ..girl or boy
    my conception should be Ard 24th April 2014…n calculated my
    Ovulation tine should be 21st to 28th April
    I’m confuse…1 doc sd it’s a boy
    another sd it’s a girl
    I really want to know what’s d gender is …my due date is 15th
    Jan 2015

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  • Rose

    Please don’t judge. My scan said I’m due on the 16th of May 2015. I have irregular periods. They are like every 2 months, my last period started on the first of July. I had sex on the 9th of August, the 19th of August, and the 23rd of August. On the 23rd of August I had sex from a one night stand. About 2 – 3 am. I woke up with blood on the sheets. My question is could that be because I was already pregnant? . He used a condom as I asked him too. We had anal sex too. He told me a couple days later that he took the condom off when we went into anal sex and ejaculated in my Anus, not my vagina. I which I didn’t realise even until then. I just thought it had all gone in the condom as I fell asleep straight after. I also slept with my ex on the 23rd but it was later on like 2 pm. I didn’t really want to as I had that one night stand and woke up with blood on the sheets, so I was slightly concerned. But all the other dates I had sex it was with my ex unprotected. About a week later I had sex with my ex again and bled again. It only last 5 mins after sex and stopped bleeding. I haven’t bled any other times since those two times Who’s more likely to be the dad as it saying possible conception day is between 19th – 23rd. Some sites give a few days either side. I’m really worried and stressing a lot about this. If any can help me figure out who it’s more likely to be. It might stop me stressing so much during my pregnancy.

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  • Jane Doe

    If my due date is April 7th 2015 and I sex on July 15th 2014 and on July 29th 2014 which day did I most likely conceive on? Also is it possible that I conceive on July 29th if my LMP was on July 1 2014?

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  • Shannon

    If my due date is December 4th and I had sex on March 19th and April 9th when did I get pregnant

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  • kris

    had sex everday during fertile period and ovulation day.. what are my chances

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