预产期计算器
计算您的预产期并跟踪孕期各阶段。
预产期
预测宝宝出生日期
本计算器使用内格勒法则（Naegele's Rule），即在末次月经的第一天加上 280 天（40 周）。这是医疗专业人员使用的标准方法。
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Estimating Your Pregnancy Due Date
概述
A due date estimates when a baby is likely to arrive, typically about 40 weeks from the first day of the last menstrual period. This calculator gives that estimate instantly from your last period date. It is a guide — only a small share of babies arrive exactly on the due date.
使用步骤
- 1
Enter your last period date
Use the first day of your last menstrual period.
- 2
Adjust cycle length if needed
The default assumes a 28-day cycle.
- 3
Read the estimated due date
It also shows roughly how many weeks along you are.
工作原理
The most common method (Naegele's rule) adds 280 days (40 weeks) to the first day of your last menstrual period, assuming a regular 28-day cycle. The tool can adjust for cycle length. Because conception timing varies, the result is an estimated date, with normal full-term delivery occurring anywhere from 37 to 42 weeks. A healthcare provider can refine it with an ultrasound.
什么时候用
Getting an early estimate of when your baby may arrive. Tracking how many weeks along you are. Planning appointments and leave around an expected date.
常见问题
It is an estimate. Only about 1 in 20 babies arrive on the exact due date; most come within a couple of weeks either side.
注意事项
Due-date estimates are approximate and for informational purposes only — they are not medical advice. Only a qualified healthcare provider can confirm your due date and monitor your pregnancy.