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Ovulation Calculator

Identify your estimated ovulation date and your body's signals during this key phase. Free and no sign-up required.

Estimated ovulation date

What is ovulation?

Ovulation is when an ovary releases a mature egg into the fallopian tube. This process, controlled by LH and FSH hormones, usually occurs once per menstrual cycle. The released egg remains viable for only 12 to 24 hours, making ovulation a brief but crucial event in the female reproductive cycle.

How is the ovulation date calculated?

Our calculator uses the calendar method, based on the fact that the luteal phase (after ovulation) lasts an average of 14 days. By subtracting 14 days from your total cycle length, we get the probable day of your ovulation. For example, for a 30-day cycle, ovulation would occur around day 16 (30 - 14 = 16). This method is reliable for regular cycles.

Physical signs of ovulation

Your body sends several signals at the time of ovulation. Cervical mucus becomes clear, stretchy and slippery (often compared to raw egg white). You may feel slight pain or a pulling sensation on one side of your lower abdomen, called "mittelschmerz". Your basal temperature rises slightly (0.2 to 0.5 degrees) after ovulation. Some women also notice an increase in libido and greater breast sensitivity.

Ovulation and hormonal health

Ovulation is an important indicator of your overall hormonal health. Anovulatory cycles (without ovulation) can occasionally occur without being a concern, but if they recur, they may signal a hormonal imbalance such as polycystic ovary syndrome (PCOS). Tracking your ovulation over the months helps you better understand your body and identify any irregularities to report to your doctor.

Frequently Asked Questions

How do I know when I'm ovulating?
Ovulation usually occurs 14 days before the end of your cycle. For a 28-day cycle, this corresponds to day 14. You can also look for physical signs: clear and stretchy cervical mucus, slight lower abdominal pain, increase in basal temperature. Pharmacy ovulation tests measure the LH peak and confirm imminent ovulation.
How long does ovulation last?
Ovulation itself lasts only 12 to 24 hours: this is the time during which the egg is viable after its release from the ovary. However, sperm can survive up to 5 days in the reproductive tract, which extends the fertility window to about 6 days total.
What are the symptoms of ovulation?
Common symptoms include clear and stretchy cervical mucus (like egg white), slight pain or pulling in the lower abdomen (mittelschmerz), increased libido, tender breasts, and a slight rise in basal temperature. Not all women experience these symptoms.
Do I ovulate every month?
Not necessarily. Anovulatory cycles (without ovulation) can occur occasionally, especially in cases of intense stress, illness, significant weight changes, or hormonal imbalance. It's common in teenagers and women approaching perimenopause. If you suspect a regular absence of ovulation, consult a healthcare professional.

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This tool provides indicative estimates and does not replace medical advice. Consult a healthcare professional for any questions.

For complete tracking, download Rythia

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