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!

68 comments

  1. Avatar of Brittany Brittany says:

    Can someone please tell me if the *AVG LENGTH OF CYCLE means average length of my period OR the length of days I’m NOT on my period????

  2. Avatar of Jessica Jessica says:

    My last period was Dec.22 but I’m not pregnant…what’s wrong with me?!

    • Avatar of Megan KlayEditor Megan Klay says:

      Hi Jessica – I’d recommend making an appointment with your doctor. This could be because of your birth control, nutrition/fitness, stress levels, or something else. Your doctor will be able to offer suggestions/tests to help. Best wishes!

  3. Avatar of chantal chantal says:

    please can you give me some advice, I am trying to get pregnant for the last several years.i have been for check ups and all are clear.i was on the depo injection for about 4 years. do you think that could be preventing me from getting pregnant, if so what can I do.

  4. Avatar of Justine Justine says:

    Can someone help me, my last period was on feb 27-mar 2 I had intercourse the 13th on ovulation… I’m having really bad stomach & pelvic pains & I don’t get cramps during pms, what’s the chance of me having a bun in the oven?

  5. Avatar of dora dora says:

    being a mother is a full time job but i will be glad to do it again in a second

  6. Avatar of Kayla Kayla says:

    Ok I had my period febuary the 1st and it lasted till the 5th. They say my due date is november the 8th. When did I conceive because idk when I ovulated.

  7. Avatar of sarah sarah says:

    I started on 2/14/2014 n i ended like a week and 2days after i started…does this mean that i might b prego? My 1st pregancy i believe i did the same thing…plus ive been feeling sick not n the morning but like afternoon or in the evenings….do u think im prego?

  8. Avatar of Cait Cait says:

    This calculator and the due date calculator give me two different days, but supposedly ovulated on the 4th so now we have the two week wait.

  9. Avatar of juneeva juneeva says:

    Im 4 months i want a girl but lets see either way im happy

  10. Avatar of Amber Amber says:

    someone help me, My last day of period was Oct 25.. and im due on july 29.. I slept with this guy on nov 2 while drunk and my boyfriend on nov 4, whos most likely to be my babys daddy?

  11. Avatar of Lynette Lynette says:

    I so want another baby but not right since we have a 13 month old and 3 year old maybe would should wait a little bit right?

  12. Avatar of Christopher Christopher says:

    I have a year and 2 month old baby girl and her brain is like a sponge, she is so smart at her age, I think she’s a genuis

  13. Avatar of Cierra Cierra says:

    Someone please help…my last period was December 1st and I had intercourse January 11th and the condom fell off in me and had fluid in it. I have had cramps back Pain and pelvic pains every now and then I’ve also been drinking a lot can someone please help me figure out if I am experiencing early signs of pregnancy

  14. Avatar of Kensie Lobe Kensie Lobe says:

    Anyone got their gender prediction wrongg?

  15. Avatar of lindsay lindsay says:

    pretty cool website!!!

  16. Avatar of mommy nhoj mommy nhoj says:

    i had a kind of app on my phone that tracks monthly period, fertility and ovulation. i never got to used it again after giving birth. Maybe I should start tracking things again as part of family planning.

  17. Avatar of joanna joanna says:

    I have never used this method I will try it this time

  18. Avatar of ashley ashley says:

    Love it it helps so much

  19. Avatar of Timothy Timothy says:

    we used this method

  20. Avatar of Gabriella Gabriella says:

    always good to know so if you arent ready or if you are you can make it work in your favor!!!!

  21. Avatar of starlena starlena says:

    i think it is cool because it helps me out alot

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