You want to know when you ovulate and when your fertile days are? With the OvulaRing ovulation calculator you can now easily calculate your cycle, because the time of your ovulation is crucial if you want to get pregnant, for example. However, please note that the ovulation calendar with your fertile days cannot be a reliable contraceptive.
Ovulation CalculatorNow enter the first day of your last period and your cycle length and you will receive your personal ovulation calendar.
Important information about the ovulation calculator:
How does the ovulation calculator work?
How reliable is the ovulation calculator?
Note: not suitable for contraception
Understand your cycle:
Precisely determine fertile days with OvulaRing
Alternatives to the ovulation calculator
Fertile days: get pregnant faster now
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With the help of our ovulation calculator you can calculate your next ovulation and thus determine your fertile days. With this information you can better understand your cycle, get pregnant in a targeted way or support natural contraception. Please note, however, that using the ovulation calculator alone is not suitable as a contraceptive.
To get a result, you need to enter the date of your last cycle start (first day of your period) and at least the length of one of your last cycles. The result will be more accurate if you enter the lengths of your last 3 cycles into the ovulation calculator.
The OvulaRing ovulation calculator uses the findings of the OvulaRing method to calculate your next ovulation. Based on the entered cycle(s), the expected cycle length is determined. As the second cycle phase is more stable in time than the first, it is used for a more accurate estimate. The second cycle phase is usually between 11 to 15 days long. On average, it is 13 days.
On the day of ovulation, a mature egg is released from the ovary. This time can vary from cycle to cycle and is triggered by the increase in luteinising hormone (LH). The released egg travels to the fallopian tube where it is fertilised. At the same time, the lining of the uterus is built up for a possible pregnancy.
However, if the mature egg is not fertilised, the built-up uterine lining is later rejected and released as menstruation.
Ovulation is a natural process during which certain physical signs and symptoms may occur. Not all women experience these signs, and they can vary from cycle to cycle. The most common physical signs of ovulation include:
Mid-cycle pain: A mild to moderate pain or a pulling sensation in the lower abdomen, which occurs roughly in the middle of the cycle and is therefore called mid-cycle pain.
Cervical mucus: The consistency of cervical mucus changes throughout your cycle. During ovulation, it often becomes clearer, more stretchy (spinnable) and resembles raw egg white. You can find more information on the cervical mucus method.
Breast tenderness: Some women experience more tender or slightly sore breasts during ovulation.
Changes to the cervix: The cervix may change in shape and position. During ovulation, it may become softer and sit higher up in the vagina.
Light spotting: Some women may experience light, spotty bleeding, known as ovulation bleeding. In our blog post on in-between bleeding – you can find more information on this here.
Libido: Some women experience increased sexual desire during ovulation.
It is important to note that not all women experience these signs, and some may not notice them at all. Nevertheless, these signs can be quite helpful if you want to understand your cycle better. Using an ovulation calculator can also help to determine the timing of ovulation more accurately.
Did you ovulate? If so, you can later calculate your due date based on ovulation.
These are the best alternatives to the online ovulation calculator:
OvulaRing is a medical cycle tracker that completely records your cycle and thus can accurately determine your ovulation. In addition, OvulaRing determines your fertile days and provides an up-to-date fertility status. Thanks to the patented method with vaginal temperature sensor, OvulaRing is suitable for all cycle types. As a certified medical device with app, OvulaRing is easy to use and as comfortable as a tampon. How OvulaRing works.
In the ‘classic temperature method’, basal body temperature is measured once a day. This increases slightly during ovulation. The measurement of the basal body temperature requires a little discipline and practice in the evaluation.
The consistency and appearance of cervical mucus changes during the cycle. During ovulation, the mucus often becomes clearer and more stretchy. Watching these changes can help you determine when you are ovulating.
An ovulation test (urine test) detects the increase in luteinizing hormone (LH), which triggers ovulation. They are available in pharmacies, but cannot detect ovulation 100%.
There are many mobile apps to track your cycle and calculate ovulation. Note that the accuracy of cycle apps just like online ovulation calculators is worse than that of medical methods like OvulaRing. These are often based only on the data entered and provide estimates and reminders.
If you have difficulties getting pregnant or want to understand your cycle in more detail, you can consult your gynecologist. She can perform examinations (ultrasound) and make recommendations.
These tables and calendars can help you calculate the probable time of ovulation. The accuracy here is similar to online ovulation calculators and cycle apps.
Choosing the best method to determine your ovulation depends on your personal preferences and needs. To determine the time of ovulation as precisely as possible, medical methods such as OvulaRing are particularly suitable. To know the ovulation only approximately, an alternative method is also suitable.
Timing is crucial for the fulfillment of your desire to have children. If possible, enter your last period and the lengths of your last 3 cycles into the OvulaRing ovulation calculator and let it calculate your next ovulation.
Here you will also see the expected fertile days. To increase your chance of pregnancy you should have sex several times during the fertile period. For example, every 2 days would be ideal. If you are not pregnant after several cycles in this way, we recommend that you monitor your cycle more closely (e.g. with OvulaRing) or consult a doctor.
Understand your cycle better and know your ovulation.
Use an ovulation calculator or OvulaRing to determine your fertile days.
Balanced diet and regular physical activity will boost your fertility.
Stress management to reduce psychological pressure.
Refrain from smoking and excessive alcohol consumption to improve your fertility.
Be patient and realistic about achieving your desire to have a child.
If you have questions or concerns, seek medical advice for individual support.
Want to increase your fertility? There are some tips on how you can achieve this:
A balanced diet, regular physical activity and sufficient sleep are crucial. You should also avoid smoking and excessive alcohol consumption to boost your fertility. Stress management and relaxation techniques can also be helpful. Using an ovulation calculator and knowing your fertile days are important tools if you want to get pregnant. If you are having difficulty getting pregnant despite your best efforts, it is advisable to seek medical advice in a timely manner. Your gynecologist can perform further examinations and make individual recommendations to improve your chances of a successful pregnancy.
Enter the the first day of your last period as well as the Length of your last 1–3 cycles . The more cycles you enter, the more accurate the estimate will be. The calculator will then show you the expected ovulation, your fertile days as well as the next expected period Note: These are estimates—a medical method is recommended for accurate measurements.
Every calendar-based calculator uses average values—by its very nature, it cannot be “accurate” down to the exact day. Ovulation prediction only becomes reliable when your individual cycle is measured rather than estimated (e.g., using a medical biosensor).
Limited. If possible, enter the lengths of several past cycles—the calculator will then provide a wider fertile window. The more your cycle fluctuates, the greater the variation. If your cycles are consistently irregular, continuous monitoring is much more reliable than any calculation.
With PCOS, cycles are often prolonged or anovulatory, and LH tests frequently yield false-positive results—making a calculation alone of limited value. A more reliable approach is a combination of continuous cycle monitoring and—for those hoping to conceive—medical supervision.
Yes, but proceed with caution: During these phases, cycles fluctuate significantly, so your estimate could be way off. Track several cycles before relying on the numbers.
Enter the first day of your last period and the length of your last 1–3 cycles. The more cycles you enter, the more accurate the results will be—the app will show your estimated ovulation date, fertile days, and next period.
As a rough estimate: Ovulation ≈ cycle length − 13 days. So around day 13 (26), day 15 (28), day 17 (30), or day 22 (35)—give or take a few days.
The fertile window lasts about 6 days: the 4 days before ovulation, the day of ovulation itself, and the day after ovulation. The reason: Sperm can survive for up to 5 days, while the egg remains fertile for only 12–24 hours afterward.
Yes. Based on the estimated date of ovulation and an average luteal phase (~13 days), it calculates the expected date of your next period—as a range, since cycles vary.
No. It provides only estimates and does not offer protection against pregnancy. For contraception, reliable methods (such as condoms, IUDs, or medically recommended methods) are recommended.
Yes—that’s what the estimate specifies. Ovulation tests detect the surge in LH just before ovulation, and the temperature confirms it in retrospect. The most accurate method is continuous temperature monitoring under medical supervision.
Stress, illness, travel, lack of sleep, breastfeeding, or hormonal changes can cause ovulation to be delayed—as can incorrect entries. Enter your new cycles; if discrepancies persist, consult a doctor.
Sources:
gesundheitsinformation.de – How does the female menstrual cycle work?
health.com The 5 Most Important Facts About Ovulation
cochrane.de – Does timing play a role in getting pregnant?
OvulaRing Study – Ovulation Prediction Using the OvulaRing Method
test.de – Period Tracking Apps Put to the Test
womenshealth.de – Period Tracking Apps Comparison
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