計算式
Add 280 days to the first day of the last menstrual period, adjusted by the difference between the cycle length and 28 days.
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Due Date Calculator
Due Date Calculatorの条件を入力すると、計算式と適用範囲を示した再現可能な結果が得られます。
公開中Scenario estimate端末内で計算US · USD
入力条件
実際の数値を入力
✓ 入力はこのページ内で計算され、送信・保存されません。
計算結果
Estimated due date
See the calculated details below
This result updates automatically when you change an input.
- Last menstrual period
- See the main result
- Estimated gestational age
- 280 days
- Time remaining
- 178 days
推測せず、再計算可能
計算方法
適用範囲
Use values that match your situation and location. Verify rule-based, contractual, financial or health decisions against an authoritative local source.
モデル環境
localeja-JPcountryUScurrencyUSDtimezoneAmerica/New_Yorkunit_systemimperialrules_versionus-2026.08source_languageen-US
Results are for first-pass estimates and scenario comparison. Important tax, employment, health and investment decisions should be verified against local official guidance or a qualified professional.