Pregnancy Calculator – Free Week by Week Pregnancy Calculator Online

🤰 Week by Week Pregnancy Tracker

Pregnancy Calculator

Find out how many weeks pregnant you are, your current trimester, due date, and all key pregnancy milestones — based on your last period or conception date.

First Day of Last Menstrual Period

Please select a valid date.

Enter the first day of your last period. Most pregnancies are calculated from this date.

Average Cycle Length

days

You Are Currently

-- weeks

and -- days pregnant

📊 Pregnancy Progress

Week 1Week 13Week 27Week 40

1st Trimester
Weeks 1–12

2nd Trimester
Weeks 13–26

3rd Trimester
Weeks 27–40

Due Date (EDD)

—

Days Remaining

—

Current Trimester

—

Conception Date

—

Gestational Age

—

% Complete

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🌟 Key Pregnancy Milestones

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How to Use the Pregnancy Calculator

Choose Your Input Method

Select Last Period (LMP), Conception Date, or enter your Due Date directly.

Enter Your Date

Input the first day of your last period, conception date, or your due date.

Adjust Cycle Length (LMP method)

Default is 28 days. Enter your actual average cycle length for better accuracy.

Tap Calculate

Instantly see your weeks pregnant, trimester, due date, and progress.

View Milestones

See which key pregnancy milestones you've passed and what's coming up next.

Track Your Progress

Use the progress bar to see how far along you are out of 40 weeks.

Copy & Share

Copy your results to share with your doctor, partner, or family.

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Why Use Our Pregnancy Calculator?

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3 Input Methods

Calculate from LMP, conception date, or known due date — whichever you have.

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Key Milestones Tracked

See all major pregnancy milestones with pass/upcoming status at a glance.

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Visual Progress Bar

Instantly see how far along your 40-week pregnancy journey you are.

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Mobile Friendly

Works perfectly on any device — phone, tablet, or desktop.

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Cycle Length Adjusted

Accounts for your actual cycle length for a more accurate due date estimate.

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100% Free

No sign-up, no limits — completely free forever.

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Frequently Asked Questions

Pregnancy is typically measured from the first day of your last menstrual period (LMP), not the actual conception date. This means pregnancy is counted as approximately 40 weeks (280 days) from the LMP, even though actual fertilization occurs around week 2. This is the standard used by doctors and midwives worldwide.

1st Trimester: Weeks 1–12 — major organ development, morning sickness common. 2nd Trimester: Weeks 13–26 — often called the "golden trimester," baby movements felt. 3rd Trimester: Weeks 27–40 — rapid growth, preparation for birth. Each trimester brings different developmental milestones.

The estimated due date (EDD) calculated from LMP is accurate within ±2 weeks for most pregnancies. Only about 5% of babies are born on their exact due date. An early ultrasound (before 12 weeks) is the most accurate way to confirm gestational age and adjust your due date.

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