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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 85 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
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  • Tiranika

    Hey Ms.Cocoa I took Dha test with my kids father nd it was not his but I took one Thursday wit my ex now I’m just waiting on it to come bk but I’m still nervous cause I had unprotected sex wit a guy way before both of em nd it was like March 8 I’m freaking out

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  • Coco

    Let’s say you have a week ultrasound you would take off two weeks and count back to the month you conceive. For example Sept. 10 I was 5w 5d I counted back 3w and 5d and got a estimate of when I conceived. Hope that helps.

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  • Coco

    Hey, I’m sorry to hear that but maybe its your ex like we discuss since he kept looking more like him. And don’t worry the test going to say your ex is the father not the guy in march. Continue doing for your children and be proud. Keep your head up mamas

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  • nate johnson

    question for anyone, ok so me and my ex gf had sex on the 16th, she was on birth control at the time, five days later on the 21st she got off of the birth control, and started having sex with someone else. She is pregnant, since she got off the birth control 5 days after we had sex , is there any chance it could be mine considering sperm can live for five days, and she stopped taking birth control at five days or four days ? Could it have lived inside her, and stayed there until she stopped her birth control and THEN made her pregnant? I believe she was on the 21 day pack with 7 days of sugar pills. She took them up until four or five days after we had sex, and then stopped taking them after that. Is it a very very very good chance it is the other guys? Mind you we were together for four years, unprotected for a whole year and never had a baby either. Please read carefully and respond wisely I am sick of worrying I do not want a baby with this woman she is a cruel sociopath lol.

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  • nate johnson

    Good job on having sex with another guy right when you got out of a relationship. Oh me and my ex are done, ok time to start banging other guys , dont even give it any time. Thats a real you know what!

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  • nate johnson

    so many hoe out thurr.

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  • nate johnson

    hoe

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  • jev

    Do a DNA these women are something else

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  • jev

    These women just a whore just walk and fuck down the place sorry to say but so true

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  • jev

    I had sex with a 34yr old on oct 3rd 2015 she is due june 9th 2016… her
    LMP was september 6th… she said am the father… Is that true?

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  • Coco

    It hard to say just because I don’t know if she had a regular or irregular Menstrual Cycle. But if she has a normal men’s then I would say no but if its irregular than that’s a whole different Congo. Some advice wait until the baby come and get tested.

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  • Robyn

    My husband and I had unprotected sex on April 15th, 16th, and 18th. My last period was April 8th so according to ovulation calendars, I was most fertile April 19th-24th. When is the earliest I can do a blood test to check and see if we are pregnant?

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  • Candice Pickens

    I had sexual intercourse on April 16. I went to the doctor on April 26 and the nurse told me I was pregnant. I went to have to ultrasound done yesterday but she couldn’t see anything she said I might be really early. Could my conception date be different from that day. My last cycle was April 2.

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  • jdf

    On December 3rd 2015 I was 6 weeks and 4 days pregnant according to internal ultrasound. I had sex with two men. October 30, 31st, November 1st, Nov 4th and Nov 6th. What day is likely when I conceived?

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  • Christina

    Me and my boyfriend broke up I had sex with a friend one time nov 27th 2015 and then I got back with my boyfriend dec. 9 and then a few weeks later I found out I was pregnant. When did I conceive??? Someone please help.

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  • Christina

    Me and my boyfriend broke up I had sex with a friend one time nov 27th 2015 and then I got back with my boyfriend dec. 9 and then a few weeks later I found out I was pregnant. When did I conceive??? Someone please help. And my due date is sept 4 2016.

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  • May

    I had sex six days after the first day of my menses can i get pregnant

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  • mariah

    I have a question I’m 13 weeks pregnant I had sex with a guy Jan 17 and conceived Feb 2 ,, could the guy I had sex with Jan 17yh be the father

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  • Sammie Humphries

    I’m due October 19-2016 I had sex with my ex in January after me and my bf broke up I think it was January 17th I had sex with my boyfriend came back January 21st we had sex b4 the 17th and 21st I’m so confused can someone help

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  • Michelle

    Hi I’m due on 21 st October 2016 but I don’t know the exact date when I actually concieved any help to figure this out thanks everyone

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  • Winterbaby

    My last period was from March 20th through March 24th. I had sex April 5 with condom with one guy and 10 days later which was April 15th I had sex with another guy without protection. I went to the clinic and they tell me that I’m 8 weeks pregnant as of May 18th. And they say my due date is December 25th. Why are they counting the date of my last period instead of my conception date ?

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  • Dally

    Hi

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  • Rose

    My due date is November 20,2016, is there a way that you can tell me when I did I conceive??

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  • Noname

    I had sex decemeber 31, my lmp was decemeber 28-31, I had sex again January 8th, I also had sex 2 days before I took a pregnancy test & it said positive. Which one of these 3 days would I have become pregnant from?

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  • Ericka

    I had unprotected sex on the 17 of March and today is June 7 if I’m pregnant how far would I be

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  • Ericka

    My last period was April 27. I’m 11 days late

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  • Keisha Williams

    I had unprotected sex with 2 guys one on the 12 of april and the other on the 19 my periods came the 23 and lasts for 7days im pregnant and my due date is 24 of January. Who’s the father

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  • Susana Angelica Monsivais

    :( im sorry my husband and i have been wit eachother 5 yrs we have three boy n one on the way and wen i got pregnant wit my num 4 he left me for another girl

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  • Sariah Taylor

    Please help anyone …I had sex with some one on Nov 7 because I cheated on my boyfriend but it says I was 2 weeks pregnant on Nov 11 so can this be my boyfriends baby or the other guy please help

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  • jovanna Toro

    My husband was in jail for a couple of months he came out May 3rd and we had unprotected sex all that week. How am I 7 weeks pregnant? He doesn’t think that the baby is his since if you go back 7 weeks on calendar he still wasn’t out…. Main question how am I 7 weeks pregnant if I didn’t start having sex until May 3rd-10th?

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  • Koss Rivali

    Which one did he nu
    t inside of u
    When did he said he nutted inside of u

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  • Eva martin

    The last time I had sex with my ex boyfriend was in mid April and he had testicular cancer and docs told him he had 85 % chance of haven kids. Well I had sex with a guy on 20 of may and I took a test n it came back positive when did I conceive

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  • Anonymous

    Hi, im currently 26w/2days pregnant and my husband thinks the babies are not his. He believes that the babies belongs to someone else. My last cycle was Dec 26th. We had an open relationship prior to me getting pregnant. He believes its the other guys babies. How do i convince him otherwise?

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  • Jess

    My bf had sex with his ex on Aug 14, baby was born june 2, she claims it’s his…is there any possible way?

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  • Taryn

    I am 20 weeks 5 days pregnant when did I concieve as I was on a period on the 15th February 2016 and if you take 20 weeks and 5 days back from today date is the 15th February 2016 am so confused please help

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  • Jarae

    What ended up happening ?

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  • Sassy

    I have a question me and my childs father broke up at the end of may 2016 i went to the doctor on july 10 and they told me i was 7 weeks pregnant i messed around with somebody on june 10 whos baby would it be ? Plz help

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  • Stephanie

    Your child’s father more than likely

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  • Stephanie

    Did you sleep with anyone else after your period? If you didn’t them guy yous slept on the 19th is likely to be the father .

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  • Becky

    That’s weird because I had sex March 27th , my due date is December 27th and my doctor says I conceived April 5 th, which is no way because I only had sex 9n March 27th

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