How accurate is the due date?

Only ~5% of babies are born on the exact due date. It's an estimate.

Only ~5% of babies are born on the exact due date. It's an estimate.

Pregnancy Due Date Calculator

Calculate your estimated due date based on your last menstrual period.

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Formula

Due Date = LMP + 280 days (Naegele's Rule)

Example

LMP Jan 1, 2026 → Due date Oct 8, 2026.