免费排卵期计算器
根据月经周期预测排卵日期和最佳受孕窗口。
days
Estimated Ovulation Day
14 day of cycle
Fertile Window Start12 day of cycle
Fertile Window End15 day of cycle
Fertile Window Length4 days
Estimated Ovulation Day vs Cycle Length
公式
## Ovulation Estimation **Ovulation Day = Cycle Length - 14** The luteal phase (post-ovulation) is typically 14 days. The fertile window spans from 2 days before ovulation to 1 day after. ### Fertile Window Sperm can survive up to 5 days, but the most fertile period is the 2-3 days before and the day of ovulation.
计算示例
A woman with a 28-day cycle.
- 01Ovulation day = 28 - 14 = day 14
- 02Fertile window start = 14 - 2 = day 12
- 03Fertile window end = 14 + 1 = day 15
- 04Fertile window = days 12-15 (4 days)
常见问题
When do I ovulate?
Ovulation typically occurs 14 days before your next period. For a 28-day cycle, this is around day 14. For a 30-day cycle, it is around day 16.
How accurate is this calculator?
This provides an estimate. Actual ovulation can vary by a few days. For more accuracy, use ovulation test kits or track basal body temperature.
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