By CalculatorInn Team · Updated: 2026-03-22 · Free & accurate · Instant results
Estimate your baby's due date based on the first day of your last menstrual period (LMP) or conception date.
Interactive Pregnancy Due Date Calculator
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Due Date = LMP + 280 days (Naegele's Rule)
Due Date = LMP + 280 days (Naegele's Rule)
Enter your values in the fields above and the calculator will compute results instantly using the formula shown.
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