排卵期计算器
预测您最容易受孕的日子和排卵窗口期。
排卵日
至-
精准规划怀孕
排卵通常发生在下次月经开始前14天。最易受孕的日子是排卵日及其之前的5天。
推荐工具
精心挑选的实用工具
Estimating Your Fertile Window and Ovulation Day
概述
Ovulation is when an ovary releases an egg, and the days around it are the most fertile of the cycle. This calculator estimates your likely ovulation day and fertile window from your last period and cycle length, in your browser. It is a guide, not a contraception or fertility guarantee.
使用步骤
- 1
Enter your last period date
The first day of your most recent period.
- 2
Enter your cycle length
The average number of days from one period to the next.
- 3
Read your fertile window
The tool highlights the estimated ovulation day and surrounding fertile days.
工作原理
Ovulation typically occurs about 14 days before the next period starts, so the tool counts backward from your estimated next period based on cycle length. The fertile window spans roughly the five days before ovulation plus the ovulation day itself, because sperm can survive several days. Cycle variability means these are estimates; ovulation tests or temperature tracking add precision.
什么时候用
Identifying the days most likely for conception. Understanding your cycle for family planning. Tracking your fertile window alongside other signs.
常见问题
Calendar estimates are not reliable contraception because ovulation timing varies. Use a proven contraceptive method if preventing pregnancy is the goal.
注意事项
Fertility-window predictions are estimates and are not a reliable form of contraception or medical advice. Cycles vary — consult a qualified healthcare provider for family-planning or fertility guidance.