How accurate is the due date?

Only about 5% of babies are born on the exact EDD (Expected Date of Delivery) given to them. This date is an estimate based on an average 40 week pregnancy. The most accurate way to determine the date is the ultrasound scan done at 12 weeks.

How to calculate the due date of the baby?

According to Naegele's rule: Counting back 3 months from the date of the last menstrual period (LMP), adding 7 days and a year. Or: LMP + 280 days.

孕产妇健康

婴儿预产期 (EDD)

根据末次月经计算预产期

Medically Reviewed:

Dr. Priya Sammani, MBBS, PG Dip. FM

Updated on: April 2026

❓ Frequently Asked Questions (FAQ)

预产期的准确度如何？

只有大约 5% 的婴儿是在指定的 EDD（预产期）上出生的。该日期是根据平均怀孕 40 周估算的。确定日期的最准确方法是在 12 周时进行超声波扫描。

如何计算宝宝的预产期？

根据内格勒法则：从末次月经（LMP）日期算起3个月，加上7天和一年。或者：末次月经 + 280 天。

🔗 Other Related Calculators

📚 Scientific Sources and Equations

世界卫生组织 (WHO) 和国际公认的临床医学指南和标准方程。

⚕️ For educational purposes only🔒 No data is stored✅ Completely Free

Medical Disclaimer: These calculators are provided for educational purposes only and are not a substitute for professional medical advice. Always consult a qualified physician regarding any health concerns..