Pregnancy Due Date Calculator

Estimate your baby's arrival using your known due date, last menstrual period, ultrasound date, or conception date.

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Pregnancy Due Date Calculator – Track Your Pregnancy Week by Week

Use this free Pregnancy Due Date Calculator to estimate your EDD (Estimated Due Date), current gestational age, and time remaining. You can calculate your due date from Last Menstrual Period (LMP), an existing due date, ultrasound measurements, or the conception date. It’s simple, accurate, and perfect for planning each trimester.

How to Use

  1. Choose a method: Due Date, Last Period (LMP), Ultrasound, or Conception Date.
  2. Enter the required details (and cycle length for LMP if your cycle isn’t 28 days).
  3. Click Calculate to see your due date, weeks pregnant, and time to go.

Methods We Support

Last Menstrual Period (LMP)

Adds ~280 days to the first day of your last period, adjusted for your cycle length.

Known Due Date

If your doctor gave you an EDD, enter it to see current week and time remaining.

Ultrasound Dating

Uses Gestational Age at Ultrasound (weeks + days) and ultrasound date for a precise estimate.

Conception Date

Adds ~266 days to the conception date (about two weeks after LMP in a 28-day cycle).

Baby Development by Trimester

First Trimester • Weeks 1–12
  • Heart starts beating; organs begin forming.
  • Neural tube develops; facial features appear.
  • Common symptoms: nausea, fatigue, tender breasts.
2nd Trimester • Weeks 13–26
  • Baby moves more; you may feel “quickening”.
  • Bones harden; facial features become clear.
  • Many find this the most comfortable trimester.
Third Trimester • Weeks 27–40
  • Rapid weight gain; lungs and brain mature.
  • Baby settles head-down; practice contractions may start.
  • Plan birth preferences and hospital bag.

What Your Results Mean

  • Estimated Due Date (EDD): The most likely delivery date, though only ~5% deliver on that exact day.
  • Gestational Age: How far along the pregnancy is today (in weeks and days).
  • Time Remaining: Weeks and days until your due date.
  • Trimester: Color-coded stage of pregnancy to help you follow baby’s development.

Frequently Asked Questions

It’s an estimate based on standard obstetric rules. Most babies arrive between 37–42 weeks. Ultrasound dating in the first trimester is usually the most accurate method for EDD.

Yes—enter your cycle length and we adjust the calculation. Longer cycles tend to shift the due date later; shorter cycles shift it earlier.

Early ultrasound dating (typically 7–13 weeks) is often more precise than LMP, especially with irregular cycles or uncertain dates.

First: Weeks 1–12 (badge: primary). Second: Weeks 13–26 (badge: warning). Third: Weeks 27–40 (badge: danger).

No. All calculations run in your browser for speed and privacy. Nothing is stored on the server.

Disclaimer: This tool is for education only and does not replace medical advice. Always consult your healthcare provider.

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