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Pregnancy Due Date Calculator

Estimate your due date, conception timeline, and follow weekly gestational progress.

About the Pregnancy Due Date Calculator

Estimate your due date and current pregnancy stage based on the first day of your last menstrual period or conception date.

How to use the Pregnancy Due Date Calculator

  1. Enter the first day of your last menstrual period (or conception date).
  2. Press Calculate to see your estimated due date and current week of pregnancy.

Tips for the Pregnancy Due Date Calculator

  • This is an estimate based on a standard 40-week gestation period — actual due dates can vary.

Example: Pregnancy Due Date Calculator

A last period starting January 1 with a 28-day cycle

  • First day of last period: January 1
  • Cycle length: 28 days

Result: Estimated due date October 8 (conception estimated around January 15)

With a standard 28-day cycle, the due date is set 280 days after the last period (the same as Naegele's rule: LMP + 9 months + 7 days), and estimated conception falls 14 days after the last period.

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