Ovulation and fertile window calculator
Ovulation date and fertile window from LMP and average cycle length.
About this calculator
Ovulation occurs about 14 days before the next period. The luteal phase is more stable than the follicular phase. The fertile window covers 5 days before ovulation through the ovulation day (sperm survival up to 5 days, ovum 12–24 hours).
Source
Formula version: wilcox-1995-asrm-2024-v1
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