Ovulation Calculator

Accuracy depends on cycle regularity. For consistent 28-day cycles, the estimate is fairly reliable. For irregular cycles, actual ovulation may differ by several days from the prediction.

No. This is a calendar-based estimate. Ovulation predictor kits detect the actual LH surge and provide more reliable real-time confirmation of ovulation timing.

The fertile window is the period when conception is possible: approximately 5 days before ovulation (sperm viability) through 12 to 24 hours after ovulation (egg viability).

The luteal phase is the time between ovulation and the start of your next period. It is typically 12 to 16 days (average 14) and remains relatively constant for each individual, which is why it is used to back-calculate ovulation day.

Ovulation predictor kits (OPKs) detect the LH surge that occurs 24 to 36 hours before ovulation. Basal body temperature tracking shows a 0.5 to 1 degree Fahrenheit rise after ovulation. Combining these methods with calendar tracking provides the best accuracy. This tool is for educational planning and is not medical advice.

Yes. In a 28-day cycle, ovulation typically occurs around day 14. In a 35-day cycle, ovulation shifts to around day 21 because the luteal phase stays constant at about 14 days while the follicular phase lengthens. Always consult a healthcare provider for personalized fertility guidance.

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