Ovulation calculator

Do you want to get pregnant as quickly as possible or plan the timing of your pregnancy? Then it is helpful to know your cycle exactly and to understand when you can actually conceive. Our ovulation calculator shows you when your fertile days are and when your chances of pregnancy are highest.

What is the purpose of the ovulation calculator?

When trying to conceive, it is important to know the exact day of ovulation to increase your chances of pregnancy. However, each woman's cycle is individual, and calculating it based on a calendar can quickly become confusing – especially if your cycle does not conform to the "standard" 28 days. The LILLYDOO Ovulation Calculator makes it easier for you to determine your ovulation and fertile days and shows you when the probability of conceiving is highest.

This is how ovulation is calculated

Ovulation occurs 14 days before the start of the next period and is therefore dependent on your cycle length. For example, if your cycle lasts 30 days, your ovulation occurs approximately 16 days after the start of your period. However, cycle length varies from woman to woman, typically ranging between 25 and 32 days. Accordingly, ovulation occurs earlier with a shorter cycle and later with a longer cycle – roughly between day 11 and 18 after the start of the period.

As long as you know the first day of your last period (the day when bleeding begins in full force) and your average cycle length, our ovulation calculator will determine the likely time of your ovulation as well as the period of your fertile days, the day of expected implantation, and the date from which pregnancy could be detected via a blood or urine test.

Calculate your fertile days now

Symptoms and other methods for ovulation detection

Even if the ovulation calculator gives you a good overview of your fertile days: every cycle is individual, and it can certainly happen that ovulation shifts by one, two, or more days. If your cycle varies greatly, determining the exact time of ovulation can be difficult, but with a stable cycle length, the timing of ovulation is usually consistent. There are different methods you can additionally use, which, if you know your body well, can provide more accurate results for determining your ovulation:

• Observing cervical mucus : It changes its consistency and color. On infertile days, it is rather viscous, sticky, and white; around ovulation, it becomes thin, clear, and spinnable between your fingers. Run your finger over the vaginal opening and insert it until you reach the cervix to get an impression of the cervical mucus consistency. If it forms threads when you pull your thumb and forefinger apart, the cervical mucus is spinnable.

• Measuring basal temperature: This is the body temperature measured immediately after waking up. Before ovulation, it is significantly lower than afterward. Important: to provide reliable values, the time of waking must always be the same.

• Determination with ovulation test: The test strips from the pharmacy measure the concentration of the hormone LH in urine. This increases significantly just before ovulation.

• Change of the cervix: With some practice, you can feel your cervix to determine which phase of your cycle you are in. As ovulation approaches, it becomes softer and is positioned higher in the vagina than after ovulation. During infertile days, the cervix is hard and closed.

• Observe physical symptoms: Some women notice their ovulation through symptoms such as lower abdominal pain, tender breasts, or increased libido.

This increases your chances of getting pregnant

Unprotected sex on the day of ovulation does not mean that you will actually get pregnant. The probability that an egg will be fertilized is about 30 percent per cycle when both partners are fully fertile. To increase your chances, it is best to have sex every two to three days during your fertile days, preferably four and two days before and on the day of ovulation itself.

Good to know: You are fertile for this long

From the beginning of the first period until menopause, usually one egg matures each month in your body, sometimes even several, and is transported to the fallopian tube with ovulation, where it can be fertilized. The lifespan of the egg is limited: it takes between 12 and 24 hours to travel through the fallopian tube, during which it can be fertilized – afterwards, it dies. Unrestricted fertile sperm cells, on the other hand, can survive up to five days in the female body. This means that you are not only fertile on the day of ovulation but also five days beforehand and 12 hours afterward. Per cycle, there are therefore roughly five days during which you can become pregnant.

It is still not possible to influence your child's gender with absolute certainty. Only medical options could provide one hundred percent certainty – however, gender manipulation of embryos is prohibited for ethical reasons.

With the ovulation calculator, you can determine your ovulation and fertile days, thereby narrowing down the period when your chances of conceiving are highest. However, the calculations are based on a general pattern and can only provide approximate values: your cycle is individual and may always fluctuate. Therefore, the calculator is not suitable as a contraceptive . If you do not want to become pregnant, be sure to consult your doctor about suitable contraceptive methods. Even if you want to become pregnant and your cycle has been very irregular for several months, your doctor can help you. The most important thing when planning for a pregnancy, however: don't let yourself get stressed and try not to pressure yourself too much with probabilities and calculations when trying to conceive.