Women & Girls Health
Fertility Window Calculator
See the handful of days when conception is most likely.
An egg lives for about a day, but sperm can survive inside the body for up to about five days. That means the "fertile window" spans roughly the five days before ovulation plus the day itself. Whether you're hoping to conceive or simply want to understand your body, this shows those days.
Educational only, not a medical diagnosis. Fertility-awareness timing should not be relied on alone to prevent pregnancy.
Free & private
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