Free Ovulation Calculator
Find your fertile window and the best days to conceive — based on your personal cycle length
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Understanding Your Ovulation
What is ovulation?
Ovulation is when your ovary releases a mature egg. It typically happens around day 14 of a 28-day cycle — but every woman is different. Cycles can range from 21 to 35 days and still be completely normal.
What is the fertile window?
Your fertile window is the 6 days leading up to and including ovulation day. The 2 to 3 days just before ovulation are your highest-chance days to conceive, since sperm can survive up to 5 days inside the body.
Signs of ovulation
Common signs include changes in cervical mucus (clear and stretchy like egg whites), mild one-sided pelvic pain, a slight rise in basal body temperature, breast tenderness, and increased sex drive.
How to improve accuracy
For best results, track your cycle for 3 or more months to find your true average length. Combine this calculator with OPK (ovulation predictor kit) tests and basal body temperature tracking for the most reliable picture.