Due Date Calculator

Calculate your estimated delivery date and see your pregnancy journey milestones.

Estimated Due Date

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Week 1 1st Trimester

Important Milestones

Planning for your big day?

Enter your dates to generate a personalized pregnancy timeline and discover when your baby is expected to arrive.

The Most Exciting Countdown of Your Life

Finding out you're pregnant is a whirlwind of emotions. One of the very first questions everyone asks is: "When is the baby coming?"

While only about 5% of babies are born exactly on their due date, having an Estimated Due Date (EDD) is crucial for tracking your baby's development, scheduling prenatal appointments, and preparing your home for the new arrival. Our tool uses Naegele’s Rule, the gold standard for pregnancy dating.

Pregnancy Due Date Calculator Online Tool

How to Calculate Your Due Date

  1. Choose Your Method: You can calculate by the date of your Last Menstrual Period (LMP) or, if you know it, the Date of Conception.
  2. Enter the Date: Input the first day of your last period or the day of conception.
  3. Get Your Results: We’ll give you your estimated due date and tell you how many weeks and days pregnant you are right now.

What Happens During the 40 Weeks?

Pregnancy is usually divided into three vital trimesters:

  • First Trimester (Week 1-12): The "Foundation" phase. Major organs begin to form.
  • Second Trimester (Week 13-26): The "Golden" phase. You’ll likely feel the baby’s first kicks!
  • Third Trimester (Week 27-Birth): The "Preparation" phase. The baby grows rapidly.

Why Due Dates Change

From our experience helping parents-to-be, we know that due dates aren't set in stone. Here is why your date might shift:

Ultrasound Accuracy

Early scans (8-12 weeks) are often more accurate than the LMP method because not everyone has a perfect 28-day cycle.

Ovulation Timing

You may have ovulated later or earlier than expected, which shifts the actual start date of the pregnancy.

Irregular Cycles

If your cycles vary in length, the standard 280-day calculation might need adjustment by a professional.

Medical Disclaimer

This calculator is for informational purposes only and does not constitute medical advice. Pregnancy is a complex medical condition, and you should always consult with a licensed healthcare professional for prenatal care and official dating.

Frequently Asked Questions

It’s an estimate. Most babies arrive between 37 and 42 weeks. Only 5% arrive on their exact due date.

It’s the age of the pregnancy measured from the first day of your last period, rather than the date of conception.

Yes! Sellooo does not store your dates or track your pregnancy. We provide the calculation in the moment and then clear the data for your peace of mind.

Yes, it’s good to establish prenatal care early to ensure a healthy journey for both you and your baby.

IVF due dates are usually calculated by the transfer date—consult your fertility clinic for the most exact date as it bypasses the LMP estimation.