关于本计算器
Due date from first day of last period plus 280 days adjusted for cycle length, with current week.
预产期计算器
按末次月经算预产期与孕周。
输入计算参数
计算结果摘要
预产期2027年5月14日
孕周8 wk
天220 天
常见问题
Naegele rule?
LMP + 280 days (≈40 weeks), shifted by cycle − 28.
Irregular cycles?
Early ultrasound dating beats calendar math then.
Only 5% on time?
Most births land within two weeks around the estimate.