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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 78 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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ask
  • Keizh

    If i conceived June 9th, when did i have sex to get pregnant?????….. im due March 1st, last menstrual period was June 3rd but according to my 12 week sonogram im gonna be 36 weeks on February 2nd and according to period i should be 34 weeks 5 days. CONFUSING!!! i just want to know when did i have sex to get pregnant….. intercourse dates were May 10th, 17th, 24, 25, 26 and pretty much every day after that except June 3rd-9th when i had my period…. after period i had sex almost every single day and i didn’t get my expected period June 23rd.

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  • Coco

    They add on two weeks starting with your last Menstrual and you most likely conceived in June.

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  • Becca

    I have a question I really dont recall when was my last period but according to ultrasound my due date is April 1st.
    So I had sexual intercourse with someone on July the 2 then the 4,5,6,7 with someone else.
    And I guessed my ovulation date was the 10 most likely whoa the dad??

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  • Tiranika

    My cycle has always been irregular.The last period i got was Jan 28 and thank You

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  • rae

    I had sex September 8 but took the morning after pill the next morning , & had a period but then had sex September 30, and then October 1,2 && went to the doctor october 14 and was 5 weeks & 6 days but I have this calendar app that says for september my due date would be June 28. But I’m due June 27 and if I concepted around October I would be due July 9. So I’m so confused

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  • Coco

    Did both ejaculate inside you?

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  • Becca

    Yes

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  • Becca

    But from what It heard sperm can only live 3 to 5 days,I’m confused/:(

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  • Coco

    That’s hard to say due to both did but sperm can survive up to six days so you will really need to get a DNA test sorry

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  • Coco

    I’ll ask my doctor this Monday but I’m pretty sure its 7or 6 days. But don’t beat yourself up about it everything will be OK. Just try to enjoy your pregnancy.

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  • Coco

    Is this your first pregnancy?

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  • Becca

    Thanks coco,then today I had an ultrasound on monday and they told me shes measuring 30 weeks 4 days.
    But according to my due date and all tomorrow I’m 32 weeks so idk.
    Thanks I just need an answer ????????

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  • Becca

    No its my second pregnancy.
    And then today they told me the baby is measuring 30 weeks and 4 days but according to my due date and all Tomorrow I’ll be 32 weeks

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  • Becca

    Tomorrow

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  • Coco

    Well it’s correct that’s you conceived in June but idk I’m kind of lost I’m new to this girl and you welcome. I understand that you need a answer idk if you believe in prayer but if you do just pray on a sign. Cheer up hun

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  • Becca

    Thanks coco and yes I do believe in prayer,I been asking God for forgiveness and praying alot.
    I was living in sin and I see that now.

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  • Coco

    That’s good and we all make mistakes in our lifetime but don’t let this mistake ruining you just keep your head held high and don’t ever make the same mistake again. We live and learn. But everything happens for a reason and you don’t have to explain yourself to anybody but god and your child. Keep me in contact if you don’t mind. I wish you the best of luck from the bottom of my heart. ????

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  • Coco

    Sometime in the middle of august I believe if you have a 28 day cycle.

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  • Becca

    Thanks coco I will,that’s for sure …
    Thanks for understanding ????????

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  • Tiranika

    Thank you and no i didnt get a period in April was i suppose to?

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  • Coco

    Did you find out in April from a missed period?

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  • Coco

    You Welcome Becca ????

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  • Coco

    If your doctor confirm that you dye date is June 27 then that’s a sure thing that your intercourse from sept 30-2 is what gotten you pregnant. And the doctors add on two weeks from your last period so technically you were 3w6d so count back 3w and 2days to figure out well get an idea if conception then add the two weeks on to equal 5w6d starting with October 14 . hope I made that clear enough for you.

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  • Tiranika

    Yea i took a home pregnancy test on the 6 nd went to the dr on the 16

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  • Coco

    Of what month? And since it been two months so far who does the baby favor to you? That can help to what features.

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  • Tiranika

    I took 1 in April. He came out looking like my kids but after like 2 weeks he started to look like my ex and now he look just like my ex I figured he was gonna grow oit of it but he’s growing to look morw like him and his family as in sister her baby and his kids

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  • Coco

    Have you ever thought about getting him tested? I just wish you the best of luck and don’t give up.

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  • Tiranika

    I got my kids father tested 1st on the 4th of dis month just waiting for the results! Thank yu for the encouragement! Yu are great at helping people get through this

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  • Coco

    Aaawww thank you so much I just want to help others and letthem know someone care about them and their pproblem. I help the results come back 99.9 for you guys. But no matter what keep your head up and if you don’t mind I would like to know how it goes .

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  • Tiranika

    Lol i hope the results come back he’s not for him! But when they come back i will let yu kno..lol

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  • Coco

    OK girl Lol

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  • love

    I have a question as it is my first time pregnancy. I am very confused as this is what exactly happen before i got pregnant. I only have one partner for the last 4 years. We have been tried many times to get me pregnant and this time we did at last! This what make me confused. My last menstruation was July around 10-20 i cant remember the exact Date. Then i had sex with my partner on July 30, 31 and until august 15 as we have a long distance relationship so we made sex as we can. Then i found out i am pregnant was on september 3 and had ultrasound. It says that i was 7w3d pregnant which is very confusing? Then i went to my doctor she told me that i am 5weeks pregnant and my due date will be on april 19. And then recently January 15 i took another ultrasound and it has diff result. In my ultrasound impression says i am 25 weeks and 1 day AOG. I dont understand?? I want to know when i exactly got pregnant. ls anybody can give me an answer. Thanks

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  • Yetta

    I want to know why does my calculation says im 5 wks but its says i conceive jan 18…..im confused because i didnt have intercourse while i was on my period.

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