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Pregnancy Due Date Calculator

Estimate your due date and current gestational age from your last period or conception date.

How this is calculated
Naegele's rule: due date = last period + 280 days, or conception date + 266 days

Assumptions used in this calculation

  • Cycle assumption: Naegele's rule assumes a regular 28-day cycle with ovulation on day 14; actual timing varies by individual.

About this calculator

The pregnancy due date calculator estimates your due date using Naegele's rule (280 days from your last menstrual period, or 266 days from conception), along with your current gestational age and trimester.

Worked example

Last period: Jan 1, 2026

Result: Estimated due date: October 8, 2026

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