Ovulation Calculator
NEWCalculate your ovulation day, fertile window, next period, and next 3 cycles. Works with any menstrual cycle length.
#ovulation calculator#fertility calculator#fertile window#period calculator#conception calculator
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How to use
- 1Enter: YYYY-MM-DD,cycleLength (e.g. 2025-03-01,28)
- 2Cycle length: 21–45 days (28 is average)
- 3Get ovulation day, 6-day fertile window, next 3 cycles
Frequently Asked Questions — Ovulation Calculator
When do I ovulate?+
Ovulation typically occurs 14 days before your next period. For a 28-day cycle starting March 1, ovulation is around March 15.
What is the fertile window?+
The fertile window is 6 days: 5 days before ovulation plus ovulation day. Sperm can survive up to 5 days, so intercourse before ovulation can result in conception.