Due Date Calculator
Estimate due date from last menstrual period or ovulation day, show current week
Due Date Calculator is a free online Calculators tool. Estimate due date from last menstrual period or ovulation day, show current week Related terms: 预产期 · due date · 怀孕 · 孕周 · 末次月经 · 生产. Use it on this page without signing in.
推算公式：预产期 = 末次月经 + 280 天（Naegele 法则），或排卵日 + 266 天。预产期是估算值，实际分娩前后两周均属正常，请遵医嘱。
使用说明
- 输入末次月经第一天（LMP）日期
- 自动按 Naegele 法则推算预产期：LMP + 280 天
- 也可输入排卵日/受孕日（+266 天）反推
- 显示当前孕周、剩余天数与孕早期/中期/晚期阶段
常见问题
- 数据会上传吗？ 全程浏览器本地计算，不发送任何数据
- 准吗？ 预产期是估算值，约 5% 的宝宝在预产期当天出生，前后两周都正常
- 周期不准怎么办？ 用 B 超核对孕周更准确，工具仅供估算参考
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FAQ about Due Date Calculator
What can Due Date Calculator do?
Due Date Calculator is a Calculators tool. Estimate due date from last menstrual period or ovulation day, show current week You can finish the job on this page.
Who should use Due Date Calculator?
Anyone handling 预产期 · due date · 怀孕 · 孕周 · 末次月经 · 生产 who does not want to install desktop software can use Due Date Calculator in the browser.
Is Due Date Calculator safe? Is my data uploaded?
This tool runs in your browser. We do not collect the content you enter into Due Date Calculator just because you used it.
What similar tools exist?
Related tools in the same Calculators group are listed at the bottom of this page.