Free Online Pregnancy Calculator: Track Your Pregnancy Week by Week

Pregnancy Calculator

Track your pregnancy journey week by week and estimate your due date

Calculate Your Pregnancy Timeline

Enter your information to get started

What would you like to calculate?

First day of your last menstrual period:

Average cycle length (days):

Your Pregnancy Results

Your personalized pregnancy timeline

Estimated Due Date:

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Current Week of Pregnancy:

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Trimester:

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Conception Date:

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Understanding Your Pregnancy Timeline

Pregnancy is typically calculated from the first day of your last menstrual period (LMP), which is about two weeks before conception actually occurs. A full-term pregnancy is about 40 weeks, which is roughly 280 days from the LMP.

The pregnancy is divided into three trimesters:

First Trimester (week 1 to week 12): This early phase is when your body undergoes the most significant changes. Morning sickness, fatigue, and other early pregnancy symptoms are common during this time.
Second Trimester (week 13 to week 26): Many women find this the most comfortable period. Early symptoms often diminish, and the baby bump becomes more noticeable.
Third Trimester (week 27 to week 40): The final stretch where the baby grows rapidly, and the body prepares for delivery.

Remember that every pregnancy is unique, and these calculations provide estimates rather than definitive dates. Only about 5% of babies are born on their exact due date.

Frequently Asked Questions

How accurate is the pregnancy due date calculator?

The due date calculator provides an estimate based on the information you provide. The accuracy depends on having regular menstrual cycles and knowing the first day of your last period. Ultrasound measurements in early pregnancy can provide a more accurate due date.

Why is pregnancy calculated from the last period?

Pregnancy is calculated from the first day of your last menstrual period because it’s often difficult to pinpoint the exact date of conception. Most women can remember when their last period started, but ovulation and conception dates are harder to determine.

What if I don’t know the date of my last period?

If you’re unsure about the date of your last period, an ultrasound can help estimate how far along you are. Early ultrasounds (before 13 weeks) are the most accurate for dating a pregnancy.

Can my due date change?

Yes, your healthcare provider might adjust your due date based on ultrasound measurements, especially if your menstrual cycles are irregular or if the ultrasound dating doesn’t match your last period date.

Pregnancy Calculator – Estimate Your Due Date & Track Weeks

Planning a pregnancy is a beautiful journey filled with excitement, curiosity, and a touch of anxiety. One of the most common questions women have after finding out they are pregnant is: “When is my baby due?” That’s exactly where a Pregnancy Calculator becomes your trusted companion.

This free tool helps you calculate your estimated due date (EDD), track your pregnancy week by week, and prepare for the amazing months ahead.

What is a Pregnancy Calculator?

A Pregnancy Calculator is an online tool designed to estimate your baby’s due date and calculate how far along you are in your pregnancy. It uses:

The first day of your last menstrual period (LMP)

Average menstrual cycle length

Standard pregnancy duration (40 weeks or 280 days)

Doctors typically use similar methods during your first prenatal visit, but having an online calculator gives you quick insights right at home.

How Does the Pregnancy Calculator Work?

Here’s the simple formula behind most due date estimations:

Due Date = First Day of Last Menstrual Period + 280 Days (40 Weeks)

Example:

LMP: January 1

Add 280 days → Due Date: October 8

This calculation assumes a 28-day cycle. If your cycle is longer or shorter, results may vary slightly.

Benefits of Using a Pregnancy Calculator

Using a pregnancy calculator gives you more than just numbers—it offers clarity and confidence:

Early Pregnancy Planning – Know your estimated due date to schedule medical appointments.

Track Weekly Progress – Understand how your baby is developing week by week.

Nutrition & Health Prep – Adjust diet, supplements, and lifestyle for each stage.

Peace of Mind – Helps reduce stress by giving you a timeline of milestones.

Partner Involvement – Both parents can follow along with progress together.

Pregnancy Stages by Weeks

Pregnancy is divided into three trimesters, each with unique milestones:

First Trimester (Week 1–12)

Baby develops vital organs.

Common symptoms: morning sickness, fatigue, mood swings.

Second Trimester (Week 13–27)

Baby’s heartbeat can be heard.

Visible bump appears.

Energy levels improve.

Third Trimester (Week 28–40)

Baby gains weight and prepares for birth.

Mom experiences back pain, swelling, and increased movement.

Knowing your exact week helps track these stages effectively.

How Accurate is a Pregnancy Calculator?

A pregnancy calculator provides an estimate, not a guarantee. Actual delivery dates depend on:

Ovulation timing

Implantation

Baby’s growth rate

Health conditions of the mother

Only 4–5% of women deliver on their exact due date. Most deliver within two weeks before or after.

Why Use Our Pregnancy Calculator?

Unlike generic calculators, our tool offers:

Instant calculation in seconds
User-friendly interface
Accurate week-by-week progress
Free & available 24/7
Works on mobile, tablet, and desktop

Tips for Expecting Mothers

Visit Your Doctor – Confirm pregnancy and schedule regular check-ups.

Eat Balanced Meals – Include folic acid, calcium, iron, and protein.

Stay Active – Gentle exercise like walking or yoga is beneficial.

Track Symptoms – Keep a journal of physical and emotional changes.

Prepare Early – Start baby shopping and birth planning ahead of time.

Frequently Asked Questions (FAQ)

How do I calculate my pregnancy due date?

By entering the first day of your last period in the calculator, it adds 280 days to predict your due date.

Can my due date change later?

Yes, doctors may adjust it based on ultrasound results and baby’s growth.

How many weeks pregnant am I?

If your LMP was 6 weeks ago, you are considered 6 weeks pregnant—even if conception happened 2 weeks later.

Are online pregnancy calculators reliable?

They are accurate for estimation but should not replace medical consultation.

Can I calculate pregnancy without knowing my LMP?

Yes, ultrasound scans and conception tracking apps may help.