Ovulation & Fertile Window Calculator
Estimate your most fertile days to plan or prevent pregnancy.
Ovulation & Fertile Window Form
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Understanding Your Results
Ovulation typically occurs about 14 days before your next period. The fertile window includes the 5 days before ovulation and the day of ovulation itself.
Frequently Asked Questions
How accurate is an ovulation calculator?
It provides an estimate based on cycle length. Accuracy improves if your cycles are regular.
Can I use this calculator with irregular cycles?
Yes, but predictions are less reliable. Consider additional methods such as ovulation predictor kits or basal body temperature tracking.
How many days before ovulation am I fertile?
Sperm can survive up to 5 days in the reproductive tract, so the fertile window includes the 5 days before ovulation and ovulation day itself.
Does ovulation always occur on day 14?
No. Ovulation typically occurs about 14 days before the next period, which varies depending on total cycle length.
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