This calculator helps predict your ovulation date and fertile window based on your menstrual cycle. Tracking these dates can help with conception or natural family planning.
The fertile window includes the 5 days before ovulation and the day of ovulation itself. This is when pregnancy is most likely to occur because:
Time intercourse for the 2-3 days before ovulation and ovulation day. Sperm will be waiting when the egg is released.
Avoid unprotected sex during the fertile window. Note that cycle irregularities can make this method less reliable.
Many women experience physical signs of ovulation. Tracking these can help confirm your fertile window:
A slight dip then rise (0.5-1°F) after ovulation due to progesterone. Track with a special thermometer first thing each morning.
Becomes clear, stretchy (like egg white) around ovulation to help sperm travel. Dries up after ovulation.
About 20% of women feel a brief twinge or cramp on one side when the egg is released.
Increased libido, breast tenderness, light spotting, heightened senses, or bloating may occur.
Consult a healthcare provider if you experience: