为什么预产期计算很重要
了解您的预产期可以帮助您为宝宝的到来做准备，并跟踪重要的孕前发育里程碑。它还可以帮助医疗服务提供者监测您的怀孕进展并规划适当的护理。
如何使用怀孕计算器
- 1选择您上一次月经周期的第一天
- 2选择您的平均周期长度
- 3获取您预计的预产期和怀孕时间表
- 4查看您当前的孕期和重要里程碑
健康怀孕小贴士
开始早期孕前保健，服用推荐的维生素，保持健康饮食，并在医疗保健提供者的批准下保持活跃。记录你的预约和重要的怀孕里程碑。
根据以下内容计算您宝宝的预产期
您上次月经周期的第一天
August 2026
常见问题解答
在这里找到关于预产期、孕周计算和孕期重要里程碑的常见问题解答。了解不同的计算方法、准确性因素以及重要的产前日期。
计算器提供的估算是基于医疗服务提供者常用的标准方法——奈格莱法则。只有大约5%的婴儿会在预计的预产期当天出生，大多数婴儿会在预产期前后两周内出生。
如果您不确定上次月经的日期，请咨询您的医疗服务提供者。他们可以通过超声波和其他临床评估来确定妊娠期。
The common form adds 280 days (40 weeks) to the first day of the last menstrual period, which assumes a 28-day cycle with ovulation around day 14. ACOG and others treat ultrasound dating as more accurate when it is available, especially early in pregnancy.
Clinics often adjust for cycle length and rely on first-trimester ultrasound. This calculator uses a simple rule. The clinic date is the one to follow for care.
A longer follicular phase usually means ovulation was later, so a period-based due date can be too early. Tell your clinician your typical cycle length; they may adjust dating.
Gestational age is conventionally counted from the last period, about two weeks before conception in a textbook cycle. If you know conception date (for example IVF), your clinic will date the pregnancy from that protocol, not from this page.
Only about 5% of births happen on the estimated due date. It is a midpoint for planning, not an appointment with the baby. Full term is a range of weeks, not a single day.
A period-based estimate is unreliable when cycles vary widely. Early ultrasound is the standard way to date those pregnancies. See a clinician rather than trusting this form.
No. Prenatal vitamins, screening, and appointment schedules come from your obstetric provider. Use this only to understand the arithmetic behind a common dating rule.
Gestational age starts from the last menstrual period. Fetal (conceptual) age is about two weeks shorter in a typical cycle. Medicine almost always speaks in gestational weeks.
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为您的旅程做准备
使用这个计算器作为你怀孕旅程的起点。记得参加所有的产前检查，并且与你的医疗服务提供者讨论任何疑虑。
Naegele’s rule in context
Adding 280 days to the first day of the last menstrual period is a nineteenth-century rule of thumb that still appears in textbooks. It assumes a 28-day cycle. ACOG and most clinics prefer early ultrasound when dates matter for screening windows.
A due date is a statistical midpoint. Most births occur across a range of weeks around it. Use your obstetric provider’s dating for care; use this calculator to see the arithmetic.
When the calendar is the wrong tool
Irregular cycles, uncertain last-period dates, lactation amenorrhoea and assisted reproduction all break the simple rule. Those pregnancies are dated with clinic protocols, not a public form.
Formula source: Naegele's rule — American College of Obstetricians and Gynecologists