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An ovulation calculator estimates the fertile window based on the last menstrual period (LMP) and cycle length. Ovulation typically occurs 14 days before the next period (not 14 days after the LMP). The fertile window spans approximately 6 days — 5 days before ovulation plus ovulation day itself.

Водич корак по корак

1. 1Ovulation day = LMP + (cycle length − 14)
2. 2Fertile window = ovulation day − 5 through ovulation day + 1
3. 3Sperm can survive in the reproductive tract for up to 5 days
4. 4The egg is only viable for 12–24 hours after ovulation

Worked Examples