Pregnancy Due Date Calculator - LMP, Conception, or Ultrasound

Estimate your due date from LMP, conception date, or ultrasound scan (Naegele's rule)

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注意: 下記のツールインターフェースは現時点で英語のみに対応しています。UI の翻訳は順次進めています。 このツールを英語で見る →
Estimated due date
Sat Jun 12 2027
Current gestation: 0 weeks 0 days
Based on Naegele's rule (280 days from LMP). This is an estimate - only ~5% of babies are born on their exact due date. This tool is not medical advice; consult your healthcare provider for a clinical estimate.
あくまで推定値です。 計算結果は入力値に基づく一般的な式から生成された、情報提供のみを目的とするものです。金融、税務、法律、医療、または専門的な助言ではなく、個々の状況、管轄、税金、手数料、健康状態を考慮していません。重要な数値は必ず有資格の専門家に確認してください。本ツールの利用により、以下に同意したものとみなされます: 利用規約と免責事項.

使い方

  1. 1
    Pick a method

    LMP (last menstrual period), conception date, or ultrasound scan.

  2. 2
    Enter the date

    For LMP, add your average cycle length if not 28 days. For ultrasound, add the reported weeks + days.

  3. 3
    Read your due date

    See the estimated due date and your current gestational age in weeks + days.

Pregnancy Due Date Calculator - LMP, Conception, or Ultrasound について

Free pregnancy due date calculator using Naegele's rule (280 days from LMP). Choose from three input methods - last menstrual period (with cycle length adjustment), known conception date, or an ultrasound scan with the reported gestational age. Also shows your current gestation in weeks and days. Runs entirely in your browser. 712 Tools の Pregnancy Due Date Calculator - LMP, Conception, or Ultrasound はモダンな JavaScript API を使って完全にブラウザ内で動作します - サーバーがあなたのデータを見ることは一切ありません。つまり、即時の結果、完全なプライバシー、アップロード制限なしです。

デバッグ、簡単な確認、あるいは本番のインシデント対応まで - このツールは何度でも無料で使えます。ウォーターマークなし、サインアップなし、ツール内広告なし。

よくある質問

How accurate is a due date estimate?

Only about 5% of babies are born on their exact due date. Most arrive within two weeks either side.

Which method is most accurate?

An early ultrasound (before 13 weeks) is usually the most accurate. LMP is close if your cycles are regular.

Is this medical advice?

No - this is informational only. Consult your healthcare provider for a clinical estimate and prenatal care.

Is my data uploaded?

No. All calculations run entirely in your browser.

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