Skip to content

Pregnancy Due Date Calculator

Calculate your estimated due date from your last period or conception date. See current week, trimester, and pregnancy progress.

FreeNo SignupNo Server UploadsZero Tracking

Pregnancy Details

Estimated Due Date

Monday, November 16, 2026

Week 8, Day 020.0%
Week 1Week 13Week 28Week 40

Trimester

First

Current Week

Week 8

Days Left

224

Export
Embed code
<iframe src="https://fitcalc.dev/embed/due-date" width="100%" height="600" frameborder="0" title="Pregnancy Due Date Calculator - FitCalc"></iframe>
<p style="font-size:12px;text-align:center;margin-top:4px;">
  <a href="https://fitcalc.dev/tools/due-date" target="_blank" rel="noopener">Powered by FitCalc</a>
</p>
Attribution preview

Powered by FitCalc

How to Use Pregnancy Due Date Calculator

  1. 1

    Choose method

    Select whether to calculate from your last menstrual period (LMP) or conception date.

  2. 2

    Enter date

    Enter the first day of your last period or your estimated conception date.

  3. 3

    View due date

    See your estimated due date, current week, and trimester.

  4. 4

    Track progress

    View a progress bar showing where you are in your pregnancy.

Frequently Asked Questions

Using Naegele's rule: from LMP, add 280 days (40 weeks). From conception, add 266 days (38 weeks). Only about 5% of babies are born on their exact due date; most arrive within 2 weeks before or after.

First trimester: Weeks 1-12 (organ development). Second trimester: Weeks 13-27 (growth and movement). Third trimester: Weeks 28-40 (rapid growth, preparation for birth).

This provides an estimate based on average pregnancy duration. Ultrasound dating in the first trimester is more accurate. Your healthcare provider may adjust your due date based on ultrasound measurements.

If you know your conception date, use that option instead. Otherwise, an early ultrasound (before 12 weeks) can accurately estimate gestational age and due date.