Ovulation Calculator
Calculate Ovulation Date, Fertile Window & Next Period
Enter your last period start date and average cycle length to find your estimated ovulation date, fertile window, and next period date.
🌸 What is Ovulation?
Ovulation is the release of a mature egg from the ovary. It typically occurs 14 days before the next expected period. The fertile window spans about 6 days: 5 days before ovulation through the day of ovulation, when pregnancy chances are highest.
📝 How to Use
- Select your last period start date
- Enter your average cycle length (typically 21-35 days)
- Click calculate
- View your ovulation date and fertile window
- Check the 3-month calendar for visual fertile period tracking
💡 Helpful Tips
- If your cycle is irregular, use the average of the last 6 months
- Use ovulation test strips (LH strips) for more accuracy
- Basal body temperature rises 0.2-0.5F after ovulation
- 2-3 days before ovulation have the highest conception rates
- Stress, travel, and weight changes can affect your cycle
❓ FAQ
It is fairly accurate for those with regular cycles, but individual variation exists. For better accuracy, combine with ovulation test strips or basal body temperature tracking.
Record your cycles for the last 6 months and use the average. If cycles vary by more than 7 days, consult a gynecologist.
The fertile window has the highest probability, but sperm can survive up to 5 days inside the body, so pregnancy is possible outside the calculated window.
📚 各地区计算规则说明
计算逻辑
采用公开的金融、贷款、比率与单位换算标准公式。
参考范围
参考公开标准与各地区常见实务规则。
前提条件
税费、费率、上限会因地区和机构而不同。
结果解读
结果可作为基准情景。正式决策前请与当地机构报价和税务规则对比。
地区默认值
货币: CNY
单位: metric
税务模型: US payroll estimate
法规提示
本工具基于地区预设进行估算。实际合同条款与法定上限可能因机构和当地法规而不同。
建议操作
- 正式申请前请至少比较 2~3 家本地机构方案。
- 再次核对费用、税务处理和提前还款条款。
- 用利率 +1~2% 与收入下降场景再测一次。
做真实决策前，请先确认当地机构的最新条款。