Ovulation & Fertile Window Calculator
Estimate your most fertile days and likely ovulation date from your last period and average cycle length. An estimate based on cycle averages β fertility varies cycle to cycle.
Quick answer
Ovulation usually happens about 14 days before your next period. Your most fertile days are the five days before ovulation plus the day itself. This is an estimate based on cycle averages.
Medical disclaimer: This is general health information, not medical advice. It does not diagnose or treat any condition, and the results are estimates based on public reference formulas. Always consult a qualified doctor about your individual health. If you think you may have a medical emergency, contact your local emergency services immediately.
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