Ovulation Calculator

Are you trying to get pregnant or planning on it in the near future? If so, you can greatly improve the likelihood of getting pregnant by determining when you will ovulate next. Ovulation is the release of a female's ripe egg from her ovary. When this occurs, you are the most fertile.

Use our Ovulation Calculator to estimate your next ovulation date; simply enter the first day of your last menstrual period and the average length of your cycle. Because our tool provides you with only an estimate, consider yourself the most fertile during the period of 3 days before and 3 days after the estimated ovulation date. Best of luck!!

* Last Menstrual Period:
(MM/DD/YYYY format)

* Avg. Length of Cycles:
(22 to 45) (defaults to 28)

Estimated Ovulation Date:

Tell us what you think!


  1. Avatar of Teri Teri says:

    Hi guys need help! My last period was 25th February it’s now 7days late am I pregnant how far am I? So confusing I have symptoms of dizziness headaches backache heartburn tiredness Moody I also got a cold I don’t drink or smoke either I always eat healthy! Please help

  2. Avatar of ireana ireana says:

    this question isnt necessarily for me, but the answer would be a BIG HELP!!!

    my friend slept with my boyfriend on September 7th 2014 and then on the 23rd of September i found out about them. She claims she was already 4 weeks pregnant on the 23rd when i found out, but if so how could it be my ex boyfriends baby if she was that far along already??? She knows that its between my now ex boyfriend and one other guy she messed with but she cant narrow it down and time is winding down for her son to be born.

    • Avatar of Megan KlayEditor Megan Klay says:

      Hi Ireana – It’s tough to say without knowing this person’s cycle. You may find our Due Date Calculator to be more helpful, it will give you an estimated date of conception. I recommend she discuss paternity testing options with her doctor.

  3. Avatar of S S says:

    Need help on cycle…My last period was 2/22/2015 & the one before that was 1/26/2015 would my cycle be 27 or 28 days? When should i start having sex in order to conceive? Thanks

    • Avatar of Megan KlayEditor Megan Klay says:

      Hi there – I just counted the days in between your most recent cycles and it’s 27 days. I recommend buying some ovulation predictors and begin testing a few days before the calculated ovulation date. I’d also start having sex every other day at that time. Once you have a positive ovulation test have sex that day and for each of the few days following. Good luck!

  4. Avatar of Jessica Jessica says:

    Hi! My boyfriend and I have been trying
    To get pregnant for awhile.. I usually start my period on the 24th of every month or around the 1st… If that’s so, when is the best time for us to have sex? It’s all just getting really confusing. Thanks so much! Pleaseessage me back!

  5. Avatar of kady kady says:

    my period was feb 2nd to feb 6 i had unprotected sex on the 9th 16 & 17 but today my test says negative …HELP TTC

  6. Avatar of amy amy says:

    Hi all. My last period was 2nd feb and last until 6th feb and i ha unprotected sex with my fiance on 13th amd 14th feb could i be pregnant

    • Avatar of kady kady says:

      Hey amy did u ever find out if your pregnant? me too had my period feb 2 to the 6 had unprotected sex on the 9th 16 and 17 but 2 negative pregnancy test :(

  7. Avatar of Quona Quona says:

    Trying to conceive

  8. Avatar of dawnisha dawnisha says:

    Hello, my estimated ovulation date was January 26th, I didn’t have intercourse until Feb 1 and I am now 6 weeks prego. I’m so confused as to how that could be. Help please?

    • Avatar of Megan KlayEditor Megan Klay says:

      Hi there – This is an estimated ovulation date, meaning you may have ovulated within a window of a few days before or after the date provided. Also, an egg lives for 12-24 hours after you ovulate. Best wishes!

  9. Avatar of nena nena says:

    Help a sister out please ! .my circle is 28 days . My period started today 18th feb, please what date should i have sex to get pregnant. I’m in my early 30 . Thanks

  10. Avatar of Janica Janica says:

    Hello. I need some help . Someone please answer . I started my period on the 2nd of February of this year. And it finished the 6th of February . My bf and I had intercourse on the 10th and the 11th. We stopped on the 12th and 13th. We had sex again on the 15th… Can I be pregnant ? I took a pregnancy test on Monday . And it showed a negative is it too early or when can I test again ? Need sum input please

  11. Avatar of charlie charlie says:

    Hi everyone need some help.. me and my life long patner split .. i had a period on the 18th of jan, i am a normal 28day cycle, i had sex with someone on the 22nd of jan and then my long partner on the 28th-31st i found out today i am 4 weeks pregnant.anyone know who the daddy is :( he dosent no about the other guy and were back together am so scared x

    • Avatar of Megan KlayEditor Megan Klay says:

      Hi Charlie – According to the Ovulation Calculator you likely ovulated on 2/1/15. I’d recommend discussing paternity testing options with your doctor. Best wishes!

  12. Avatar of crystal crystal says:

    I had unprotected sex on december 7th 2014 and just found out im 11weeks preagnant from my last menstrual, but could i have gotten preagnant on the 7th of December or was it before?

  13. Avatar of Jennifer Jennifer says:

    Hi I just had my baby on the 29th of December, I was 31weeks and 2days. I had my menstrual on the 10th to the 13th of May, but the doctors said that it did not line up with when I ovulated. So I’m not sure how to figure out when I ovulate, or how many days my cycles are.

    • Avatar of Megan KlayEditor Megan Klay says:

      Hi Jennifer – Congratulations on the birth of your baby! How is baby doing? What you experienced on the 10th-13th of May could have been implantation bleeding, was it as long or as heavy as your normal flow? What did the doctor estimate your due date would be based on baby’s size is ultrasounds? This should help to calculate the date you conceived.

  14. Avatar of brittney brittney says:

    Please help by commenting?

  15. Avatar of brittney brittney says:

    Please help, I have a 29/30 day cycle length. My last menstral cycle started on Nov 17 and I had sex with guy 1 on the 22nd, then I had sex with guy 2 Nov 24- present. My cycles are regular and they set my due date for 08/24/15. Who has a better on being a father. Everyone makes mistakes.

  16. Avatar of Jacey Jacey says:

    my period is usually a 28 day cycle but last time it was 39 days and now i’m at day 36 with no sign of a period yet. can average cycle lengths change over time? Whats the best way to predict ovulation if it keeps changing? I took a pregnancy test on day 33 recently and it was negative. Could it have been too early to get a positive result?

  17. Avatar of Rachelle Rachelle says:

    hi, I have been trying to conceive for a year now..
    April cycle – 30 days
    May cycle – 28 days
    June cycle – 33 days
    July cycle – 44 days
    August cycle- nothing
    September cycle – 35 days
    October cycle – 27 days
    November cycle started 2nd ended on the 7th.. we had unprotected sex on the 6,9,12,13,14,15,16,20,26,27,28 and the 29th… Im now 1day late for my 33day cycle.. im having cramps and slight nipple pain and some nausea, dizziness and headaches started about a week ago… i haven’t tested because im afraid to see a negative… No period, 1day late, cramping, eating a lot, frequent urination, and BABY DREAMS… Please help!!

  18. Avatar of Kaliyah Kaliyah says:

    My last period started November 1st & lasted about 6 or 7 days, I had protected sex on the 12th of November. It is now decemember 6th & I have no period but I’ve been having cramps what could it be?

  19. Avatar of Shalanda Shalanda says:

    Hey, I have a question?? Ok I got my period November 26th – November 30th , And I had unprotected sex December 1st and my boyfriend ejaculated in me we didn’t stop or none we just coming going.. so I wanna know what are my chances on getting pregnant help?

  20. Avatar of Tyrene Tyrene says:

    Hey! Quick question. I got period October 11, 2014 and I only had sex on October 30, 2014. Now my period is 22 days late. Is it possible that I’m pregnant?

  21. Avatar of Arienmattes Arienmattes says:

    Please help. I started my period on the 28th this month(november) will i be ovulating around December 22nd?

    • Avatar of Megan KlayEditor Megan Klay says:

      Hi there – That depends on the length of your cycle. How many days do you typically have from the first day of one period to the first day of the next? The calculator fills in an average of 28 days, but this is not necessarily the same for every woman.

  22. Avatar of Neetu Neetu says:

    Hii everyone plz help me…
    Im 29 yrs and my periods dates as follow in sept-7th, oct-5th, nov-2nd 2014.
    I had sex with my husband on 12th late night and 14th late night. Plz help
    M i pregnant. Bcoz this is for v 1st time im tryin to
    Concieve. Plz help.

  23. Avatar of candy candy says:

    Hi.. My first day of my last period was November 1, 2014 and I had sex November 16, 2014.. what are my chances of being pregnant.??? last month my first day of menstrual was October 1,2014.. help please…

  24. Avatar of RoseDrag RoseDrag says:

    Hi! My first day of my last period was November 17, 2014 and we had sex last night November 28, 2014. Is there a chance I will get pregnant? Last month my first day of menstrual was October 20, 2014. Help pls.

  25. Avatar of Nikki Nikki says:

    h my period is late..i had my last period on 10/10/14 and it was pretty normal…my cycle is between 28 to 32 days i usually have regular periods…..has anyone here had the same problem?

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