Pregnancy Due Date Calculator

What this pregnancy due date calculator actually tells you

This delivery due date calculator estimates three key milestones in your pregnancy journey:

• Your Estimated Due Date (EDD) – the approximate date your baby will reach 40 weeks of development.

• Your Current Gestational Age – helping you track your pregnancy week by week accurately.

• Your Current Trimester – so you know exactly which developmental stage your baby is in right now.

Whether you choose to calculate my due date using the first day of your last menstrual period or need a due date calculator by conception date, this tool gives you a simple, reliable snapshot of your timeline.

Important: While parents often look for a 100 percent accurate due date calculator, only about 4% to 5% of babies are born on their exact expected due date. This calculator provides an estimation. It cannot replace medical advice or an early pregnancy scan from your healthcare provider.

How to calculate pregnancy due date using this tool

1. Choose your calculation method. Select whether you want to calculate using your First day of last period or your Conception date.

2. Enter your date. Select the appropriate date on the calendar input.

3. Select your cycle length (if using Last Period). The standard default is 28 days.

4. Click Calculate.

You’ll see:

• Your Estimated Due Date

• Your Current Pregnancy Stage (Weeks and Days)

• Your Trimester Status

How to Calculate Due Date: Understanding the Methods

If you are wondering how to calculate due date options, medical professionals generally use three primary methods depending on your conception journey:

1. By Last Menstrual Period (Naegele’s Rule)

For most natural conceptions, an estimated due date calculator uses Naegele’s Rule:

2. Due Date Calculator Conception

If you tracked ovulation or know the exact day you conceived, a due date calculator by conception adds 266 days (38 weeks) directly to your conception date.

3. IVF Due Date Calculator & Ultrasound Confirmation

• IVF Due Date Calculator: For pregnancies conceived via In Vitro Fertilisation (IVF), the due date is calculated precisely using your embryo transfer date and embryo age (e.g., Day 3 or Day 5 transfer).

• Due Date Calculator using Ultrasound: A due date calculator by ultrasound uses early crown-rump length (CRL) measurements taken during a first-trimester scan to confirm or adjust your official clinical due date.

Reverse Due Date Calculator: Working Backwards

If you already know your due date or birth date, a reverse due date calculator works backward to estimate when conception occurred:

• Conception Window: Subtract 266 days (or 38 weeks) from your delivery date to find your likely conception week.

Due Date Pregnancy Calculator Gender Prediction & Myth Busting

Many expecting parents search for a due date pregnancy calculator gender prediction feature. While traditional legends (like the Chinese Gender Chart or lunar age calendars) try to predict sex based on conception month and due date, scientifically, biological sex is determined strictly by chromosome pairing at the exact moment of fertilization. An ultrasound scan between 18 and 20 weeks remains the standard way to confirm gender.

A gentle reminder

Your calculated due date is a helpful guide post—not a fixed deadline.

Use this baby due date calculator to:

• Estimate your delivery window

• Plan your prenatal healthcare visits and scans

• Prepare your home and nursery with confidence

If you have questions about your pregnancy timeline, irregular periods, or ultrasound results, speak directly to your midwife, GP, or obstetrician.