Would you like to know when your fertile days are? Find out everything you need to know about ovulation and fertile days here.
Use the ovulation calculator to calculate the date of your ovulation and your fertile days. The ovulation calendar in the ovulation's
result or fertility calculator shows you the ovulation dates for the next twelve months based on the date of your last menstruation
and the duration of your fertile days.
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The answer is no. Please do not use the ovulation calculator for contraception!
In addition to the calculated fertile days, on which there is a certain probability of fertilization of the egg, there may be
other days in which sexual intercourse could lead to pregnancy. This is the least probable reason as the female cycle can be
subjected to certain fluctuations, and thus may lead to shifts in the fertile days.
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The ovulation calculator or fertility calculator requires the following two inputs to calculate the future dates of ovulation and fertile days:
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Together with your cycle length, the date of your next ovulation
and the subsequent ovulation days can be calculated by the ovulation calculator based on the first day of your last menstruation
and displayed in the ovulation calendar. This is because ovulation regularly takes place around 14 days before the start of your
next period. Therefore, the start of the next period is determined on the basis of the first day of your last period and the
length of your cycle. It should be noted that ovulation always takes place 14 days before the next menstrual period.
On the day of ovulation, an unfertilized egg in the fallopian tube can be fertilized by a male sperm cell. The lifespan of the
female egg and male sperm, in conjunction with ovulation, determines the fertile days (i.e., the days in which sexual intercourse
can lead to fertilization). This is because the sperm can survive for several days in the cervix, and the female egg can be
fertilized within 12 to 24 hours of implantation in the fallopian tube.
This means that the first chances of fertilization are already around four days before ovulation, and even on the day after
ovulation, there are good chances of achieving fertilization.
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Using the duration of your cycle (first day of your period up
to and including the last day before your next period) and the date of the first day of your last period, the ovulation calculator
can determine the date of your next ovulation and display it in the ovulation calendar. Since ovulation always occurs around
14 days before the start of your next period, the ovulation calculator first calculates the date of your next period and then
goes back 14 days to determine the date of your ovulation. In this way, the ovulation calculator determines your ovulation dates
for the next 12 months.
Ovulation (i.e., the implantation of a female egg in the fallopian tube) enables the male sperm to fertilize the egg and thus
become pregnant. The number of “fertile days” is based on the lifespan of the sperm in the cervix, which lasts for several days,
and the possibility of fertilization of the female egg can last up to 24 hours after ovulation. Therefore, this means that
sexual intercourse can successfully lead to fertilization and thus pregnancy as early as four days before the day of ovulation
and also one day after ovulation.
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Ovulation (also called follicle rupture or ovulation) is the regular expulsion of a mature, still unfertilized egg cell from the ovary.
It then “jumps” into the fallopian tube, where it can then be fertilized by a sperm (i.e., a male sperm cell). Ovulation usually takes
place around 14 days before the next menstruation occurs. With a 28-day cycle, ovulation takes place exactly in the middle of the female
cycle. However, if the cycle is longer or shorter, this may not be the case. For example, if the cycle is longer, the time from the
previous menstrual period to ovulation is longer than the 14 days from ovulation to the next menstrual period.
On the day of ovulation, the probability of fertilization (pregnancy) is 33 percent—one day before it is 31 percent. The other fertile
days are before and after this, which is related to the survival of the sperm and the duration of the fertilization of the egg.
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The expected ovulation is determined according to the following formula:
Calculation of ovulation
Ovulation = First day of the last period + (Cycle duration − 14)
Ovulation is always 14 days before the start of the next menstruation.
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As described, ovulation, and thus the possibility of fertilization of the egg, always occurs 14 days before the start of the next
menstrual period. The day of ovulation is a very fertile day, but the days around ovulation are also fertile days.
The first chances of fertilization already exist four days before ovulation, as the sperm can survive for a few days in the cervix.
Therefore, sperm that are still alive on the day of ovulation can fertilize the egg (i.e., fuse with the egg).
The day after ovulation is also considered a fertile day, as the female egg can still be fertilized by a single sperm cell within
12 to 24 hours after ovulation.
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The suitable time to take a pregnancy test is one day after the next period has not started.
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The ovulation calculator displays an individual ovulation calendar as the result. This contains all the calculated dates for your
ovulation, the fertile days around it and the dates of your menstruation.
The fertile days are marked in yellow or red in the ovulation calendar. The day of ovulation (i.e., the day with the highest fertility)
is red. The first day of the period is marked in grey. It is easy to see that ovulation is always 14 days before the next start of the
period.
With the left/right buttons in the ovulation calendar, you can know the fertile days of the next months. Meanwhile, tooltips provide
further information about the individual days.
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Mr and Mrs Kanin would like to fulfil their desire to have a child. Therefore, they want to know when Mrs Kanin ovulates and thus when
the most fertile days are for the long-awaited pregnancy. To do this, they use the ovulation calculator from Calconi.
- Mrs Kanin's first day of her last period was on 21st April.
- Mrs Kanin's cycle length is regularly 28 days
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According to Mrs Kanin's first day of her last period on 21st April and her cycle length of 28 days, her next period will start 28 days
later on 19th May.
As described above, ovulation generally occurs around 14 days before your next menstrual period, regardless of cycle length.
Therefore, the date of Mrs Kanin's ovulation is 14 days before 19th May. Finally, the fertility calculator calculates:
Mrs Kanin's next ovulation will take place on 5th May.
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The "fertile days" are the days in which sexual intercourse can possibly lead to pregnancy. Although the female egg can only
be fertilized by the male sperm for around 12 to 24 hours after ovulation, sperm survive in the cervix for up to five days.
Therefore, the rule of thumb is that fertile days start four days before ovulation and further extend by one day.
Accordingly, the following fertile days in the ovulation calendar are calculated for Mrs Kanin based on her ovulation on 5th May:
Mrs Kanin's fertile days begin on 1st May and end one day after her ovulation on 6th May.
During this time, the probability of fertilization is high in purely mathematical terms, with it being highest one day before
ovulation and on the day of ovulation itself at 31 and 33 percent, respectively.
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With modern tests, pregnancy can be detected before the next menstrual period. However, it is more reliable to wait for the absence
of the next menstruation in order to carry out the pregnancy test on the following day. In the ovulation calendar of the ovulation
calculator, this is indicated in the tooltip for the next period.
Mrs Kanin can perform a reliable pregnancy test on 20th May..
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The ovulation calendar of the ovulation calculator also shows the future dates of the next twelve months for ovulation and
the respective fertile days. For this purpose, the forward or backward buttons can be selected in the ovulation calendar.
The results are all based on the two entries in the calculator.
Mrs Kanin can (assuming a regular cycle) read the dates of the next twelve months for her ovulation in the ovulation calendar.