Ovulation Calendar

Trying to get pregnant? Find out when you are fertile with our free ovulation calendar. You don’t have to calculate anything – the ovulation calendar will do all the work for you! This free ovulation calendar calculates your fertile days based on your menstrual cycle data. Read our ovulation calendar testimonials page to hear the stories of women who got pregnant using this calendar!

Users of the ovulation calendar should always make sure that their menstrual cycle info is correct to make sure the calendar is as accurate as possible. You can read how to do that by clicking Ovulation Calendar: How to change your cycle data.

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« October 2014 »

To use the ovulation calendar you need to enter:

- The first day of your last period: this means the first day of your last menstrual flow.
- The length of your menstrual cycle: the number of days from the first day of menstruation to the day before the following menstrual period starts.
- The length of your luteal phase: if you don’t know the length of your luteal phase, you can assume it’s 14 days.


How to read this ovulation calendar?

Red indicates blood – menstrual flow:

Dates that are colored red represent the section of the month when your period starts. The first day is labeled with the darkest red, because this is usually the day menstrual flow is the heaviest. On average, a woman’s menstrual flow lasts from three to five days. Usually on the first day, the bleeding is the heaviest, and then it slowly subsides.

Green indicates fertility – ovulation:

Dates that are colored green represent the section of the month when you are most fertile – the time around your ovulation. The darkest green is labeled as THE ovulation day and this is the time you are considered most fertile. Since a woman’s fertile period starts about four to five days before actual ovulation, and ends approximately 24 to 48 hours afterward, there are several days that are colored green. All these days have a potential if you are trying to conceive.

Gender selection:

According to the Shettles method, it is possible to determine a baby’s gender by timing your intercourse. The dark gray frame around the ovulation calendar dates determines the dates that are most appropriate for conceiving. If you would like to conceive a baby boy, the frames will appear around your ovulation day, but if you would like to conceive a baby girl, a frame will appear on the days preceding actual ovulation. If you have no preference regarding the gender of your baby, no frame will appear.

How do I calculate my fertile days using our free ovulation calendar?

You do not have to do any math – our ovulation calendar will do all the work for you! Based on your menstrual cycle data, our free ovulation calendar calculates your fertile aka ovulation days.

To use ovulation calendars you need to enter:

  • The first day of your last period: this means the first day of your last menstrual flow.
  • The length of your menstrual cycle: the number of days from the first day of menstruation to the day before the following menstrual period starts.
  • The length of your luteal phase: AKA “days past ovulation” or “DPO”, is the part of the cycle that starts at ovulation and ends the day before your next period. The only way to determine the exact length of your luteal phase is through hormone-specific blood tests. If you are not sure about the length of your luteal phase, you can assume it is 14 days, which is the average length and does not vary by more than a day or two in most people.

Based on the data given, the free ovulation calendar generates your personal daily fertility chart.

For example, if your cycle is 29 days long and your luteal phase is 12 days long, ovulation will occur on day 17 of your cycle (29-12=17). Ovulation calendars use this formula to calculate your time of ovulation.

If you have a gender preference, simply select boy or girl from the gender field. The method used for gender selection is called the Shettles method. Dr Landrum Shettles claimed a 75 to 90 percent success rate for his simple at-home method, which advises how to time intercourse to conceive a boy or a girl.

**The Shettles Method is based on a theory of X and Y chromosomes. X chromosomes represent a girl and Y represent a boy. His theory is said to have 75 percent success rate with couples who want to determine baby’s sex, although as already said it should be taken with a bit of healthy skepticism.

The basic principle behind his theory claims that Y chromosomes (for those who want to conceive a baby boy) are smaller and more fragile, but faster comparing to X chromosomes that are slower, but also larger and more resilient and are able to survive longer when they are once released.

**What is ovulation?

The time of ovulation is one of the most important things a woman should understand about her body since it is the determining factor in getting pregnant and preventing pregnancy. Ovulation is the most fertile period of menstrual cycle – it is a period when woman is most likely to get pregnant or when the chances of conception are the highest. Woman’s fertile period starts about 4-5 days before ovulation, and ends about 24-48 hours after it.

**What happens during ovulation?

During ovulation a single, mature egg (aka ovum) that developed in the ovary during the menstrual cycle is released from a follicle. When the egg is released, it is capable of being fertilized for 12 to 24 hours, and then it begins to disintegrate. Ovulation usually happens in the middle of the menstrual cycle, and if the released egg (ovum) is fertilized and successfully implants, woman becomes pregnant. However, if the egg isn’t fertilized and if woman does not become pregnant, the egg is passed from the reproductive tract during menstrual bleeding, which starts about two weeks after ovulation.

However, sometimes anovulatory cycles happen. These are menstrual cycles when no egg is released but when a woman does have her period. On the other, it is also important to bring out that woman can their get period (meaning menstrual flow does occur), but she does not ovulate. The ability to ovulate does vary from month to month, and can be delayed by a number of factors such as stress, illness, diet, or increased physical activity.

**What happens in the ovaries?

Woman has two ovaries and each produces many eggs during one menstrual cycle (which usually lasts approximately one month). Largest of the eggs is expelled into the pelvic cavity and swept into the Fallopian tube. There is no regular pattern between ovaries and it is fairly arbitrary which ovary will release the eggs.

**Explaining Ovulation with Hormones

Two hormones which create conditions conducive to fertilization are produced during ovulation: oestradiol and progesterone.

Oestradiol is produced alone by the developing follicle before ovulation and it stimulates the glands of the cervix to secrete fertile mucus and to stimulate the growth of the endometrium lining the uterus.

After ovulation, both oestradiol and progesterone are produced by the corpus luteum which forms from the ruptured follicle. Progesterone causes the abrupt change in the mucus which occurs immediately after ovulation and defines the Peak symptom. This hormone also prepares the oestrogen-primed endometrium for implantation of the fertilized ovum.

Join our forum to chat about ovulation

If you have any questions, or want to chat about ovulation with other women who are trying to conceive, feel free to join the Trying To Conceive forum! And if you have a specific question about using the ovulation calendar, one of our admins will help you out.


  1. Tameka says:

    I thought I was pregnant last month because I just got my tubes reverse in march so it had to jump back on track I guess an then I was trying so hard to get pregnant to now I don’t even worry about it r stress over it anymore I just let god handle it. Just sitting back an waiting to c I was testing so much last mth to I got mad

  2. lovegirl says:

    i need to get a baby so so much

  3. Samantha says:

    What does the red dashed line box mean? There’s one 2 days after ovulation is done.

  4. Tallchic says:

    Hi tameka. It’s combination3. 28 pills to be taken everyday (one pill per day) at the same time.

  5. Ebony says:

    I want to know why I had two periods in may.in I want to have two kids

  6. gg says:

    i have my period but, i have the proble that i dont ovulate. i do work under alot of stress what can i do to help my stress reduce?and if there is anything to help me get pregnant?also my husband have low sperm counts what can i do to help him too?

  7. anita says:

    One of tubes has been detached but other is healthy my age is32 and i don’t want to go for IVF.suggest me options

  8. s.bhuvaneswaru says:

    ididnt conceive for the past 3years,i got thyroid problem and my husband got sperms count problem.what is the solution?

  9. Manu says:

    Hi Olivia,

    i m Manu.. I m 33 and near to 34. i have a daughter of 8 years old. now i m trying to conceive again.. and i will be very happy if i conceive for a baby boy.

    now my doubt is…
    my LMP 6th Feb.. and my length of mensural cycle vary every month.. it was..26, 27, 28..like that..

    now i m trying for boy..so. i m taking ovulation test from yesterday..that is from 16th feb… yesterday it was negative..

    if it is positive today or tomorrow.. when should i intimate with my husband after it is positive?

    from the test is positive..after how many hours i should try for baby boy?

    plz help me as soon as possible..

    thank you

  10. Manu says:

    my LMP s are Jan 12th and feb 6th…
    Am i late to take ovulation test??

  11. Manu says:

    Hi Olivia,

    i m 33 and near to 34.. i have a daughter of 8 years old. now i m tring to conceive after long time. my periods or irregular.. means..length of cycles varies between 25, 26, 27, 28…

    as i have daughter..i m trying for a boy..

    my last LMP s are.. Dec 16th, Jan 12th, Feb 6th…

    from 16th of thes month i m taking ovulation test.. till today it was negative..
    my doubts are…
    1. am i late to take ovulation test?
    2. if it is positive result.. after how many hours..should i intimate with my husband?

    reply me as soon as possible
    thank you

  12. Olivia says:

    Hi Manu,

    May I be very honest with you? After doing a lot of informal research into the topic of natural gender selection, I have concluded that there is no evidence whatsoever that this works. Your odds of having a boy are essentially 50 percent, unless you use medical methods, notably Microsort gender selection — which is only available to couples who have a medical need to avoid a certain gender.

    Go ahead and try being intimate AFTER your positive ovulation tests. If the myth isn’t quite a myth, it may give you a boy. If it’s all nonsense, you still have a 50/50 chance.

    All the best,


  13. zedekiahmomiee1 says:

    Is the green boxs with gray around is the day you can concieve on ?

  14. Olivia says:

    Yes, that’s right.

  15. Tere says:

    how will this calculation work for someone whose menstrual period last for 6-7days? though, as from day4, it could be termed as blood stains. how will the ovulation period be determined in this case?

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