Pregnancy Due Date Calculator

Estimate your due date from LMP using Naegele's rule. See trimester and days remaining.

How to Use the Pregnancy Due Date Calculator

  1. Enter the first day of your last menstrual period.
  2. Set average cycle length.
  3. View due date, trimester, and days remaining.

Pregnancy dating

Due dates are estimates. Cycle length and ovulation timing vary. Always confirm with your clinician.

Frequently Asked Questions

What is Naegele's rule?
Due date ≈ LMP + 280 days (40 weeks), adjusted for cycle length if not 28 days.
Is this a medical diagnosis?
No. Confirm dates with your healthcare provider and ultrasound dating.

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