Due Date Calculator

Due date and current week from last period.

Input Parameters

First day of last period

Cycle length (days)

Due dateMay 14, 2027

Weeks pregnant8 wk

days220 days

175 available

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Due date from first day of last period plus 280 days adjusted for cycle length, with current week.

Naegele rule?

LMP + 280 days (≈40 weeks), shifted by cycle − 28.

Irregular cycles?

Early ultrasound dating beats calendar math then.

Only 5% on time?

Most births land within two weeks around the estimate.