🤰 孕周计算（按末次月经）Gestational Age Calculator
按末次月经第一天计算到指定日期的孕周和天数，预产期 = 末次月经 + 280 天（内格莱规则）。仅供参考，以医生和超声为准。本地处理。Gestational age from the first day of the last menstrual period to a chosen date; due date = LMP + 280 days (the Naegele rule). For reference only - your doctor and ultrasound decide. Processed locally.
使用说明与常见问题How-to & FAQ
「孕周计算（按末次月经）」是什么？What is the Gestational Age Calculator tool?
按末次月经第一天计算到指定日期的孕周和天数，预产期 = 末次月经 + 280 天（内格莱规则）。仅供参考，以医生和超声为准。本地处理。Gestational age from the first day of the last menstrual period to a chosen date; due date = LMP + 280 days (the Naegele rule). For reference only - your doctor and ultrasound decide. Processed locally.
如何使用「孕周计算（按末次月经）」？How do I use the Gestational Age Calculator tool?
在「孕周计算（按末次月经）」中，填写「末次月经第一天」、「计算日期」、「月经周期（天）」等参数，结果会随输入实时计算并显示在下方。In the Gestational Age Calculator: Fill in "First day of last period", "As of date", "Cycle length (days)"; results are recalculated instantly as you type.
周期不是 28 天？Cycle not 28 days?
周期每长 1 天，排卵通常推迟 1 天，本页会相应调整孕周和预产期。Each extra cycle day usually delays ovulation a day; the page adjusts for it.
能举个计算实例吗？Can you show a worked example?
例如在「孕周计算（按末次月经）」中填 末次月经第一天 = 2026-01-01，计算日期 = 2026-03-12，月经周期（天） = 28，结果区显示：孕周：10 周 0 天；阶段：孕早期；预产期：2026-10-08；距预产期：210For example, entering First day of last period = 2026-01-01, As of date = 2026-03-12, Cycle length (days) = 28 in the Gestational Age Calculator gives: Gestational age: 10 weeks 0 days; Trimester: first trimester; Due date: 2026-10-08; Days to due date: 210
哪些输入会被检查？Which inputs are validated?
「孕周计算（按末次月经）」会检查这些输入——「月经周期（天）」：必须填写，不能为负数，须为整数；绝对值超过 10¹⁵ 的数也会被拒绝。不符合时结果区显示具体提示，不会给出数字。The Gestational Age Calculator checks its inputs — "Cycle length (days)": required, cannot be negative, must be a whole number; numbers above 10¹⁵ in absolute value are rejected too. When a value fails, the result area names the problem instead of showing a number.
有哪些选项可以调整？What options can I adjust?
「孕周计算（按末次月经）」的设置：「末次月经第一天」默认 2026-01-01；「计算日期」默认 2026-03-12；「月经周期（天）」默认 28。每次生成结果都按当前设置处理。Settings in the Gestational Age Calculator — "First day of last period" default 2026-01-01; "As of date" default 2026-03-12; "Cycle length (days)" default 28. The result always uses the current settings.
结果可以代替医生的建议吗？Can this replace medical advice?
不能。「孕周计算（按末次月经）」基于常用公式给出估算，个体差异较大，如有健康问题请咨询医生或专业人士。No. The Gestational Age Calculator gives estimates from common formulas; individuals differ, so consult a doctor or professional for health decisions.
「孕周计算（按末次月经）」免费吗？需要注册吗？Is the Gestational Age Calculator free? Do I need an account?
「孕周计算（按末次月经）」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Gestational Age Calculator is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.