Important Medical Disclaimer: This calculator provides estimates based on average cycle lengths and should not be used as a form of birth control or for medical diagnosis. Every woman's cycle is unique. Consult with a healthcare provider for medical advice.
Estimate your most fertile days and ovulation date based on your menstrual cycle
Typical range: 21-35 days
Typical range: 3-7 days
Typical range: 12-16 days
Ovulation is the release of an egg from the ovary. Understanding your menstrual cycle and when ovulation occurs can help with family planning or simply understanding your body better.
The uterus sheds its lining. This is your period. Hormone levels are at their lowest.
The pituitary gland releases FSH, stimulating follicles to mature. Estrogen rises.
A mature egg is released from the ovary. This is your most fertile time. The egg lives 12-24 hours.
Progesterone rises to prepare the uterus. If no pregnancy, hormone levels drop and cycle repeats.
Temperature rises 0.5-1°F after ovulation
Egg-white consistency, stretchy and clear
Mild cramping on one side (mittelschmerz)
Luteinizing hormone increases 24-36 hours before
Higher, softer, and more open
Natural increase in sexual desire
An egg survives for about 12-24 hours after ovulation. Sperm can survive for up to 5 days in the female reproductive tract, which is why the fertile window includes the days leading up to ovulation.
While unlikely, it's possible if you have a short cycle and ovulate early. Sperm can survive up to 5 days, so if you ovulate soon after your period, conception could occur.
For irregular cycles, this calculator provides estimates based on average length. For more accurate tracking, consider using ovulation predictor kits, tracking basal body temperature, or consulting a healthcare provider.
No! This calculator is for informational purposes only and should not be used as a form of birth control. Cycles vary, and relying on calendar methods alone is not reliable for preventing pregnancy.
This calculator provides estimates based on average cycle lengths and should not be used for medical diagnosis, treatment, or as a method of birth control. Every woman's cycle is unique and can vary from month to month. If you have concerns about your menstrual cycle, fertility, or are trying to conceive, please consult with a healthcare provider or fertility specialist.