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Pregnancy Calculator: Free Due Date & Week Calculator

Pregnancy Calculator helps you find your estimated due date, current pregnancy week, and trimester. Get personalized week-by-week development information and track your pregnancy journey with our free, accurate calculator.

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Pregnancy Calculator

Enter your details below

First Day of Last Menstrual Period Select the first day of your last period

Cycle Length

Luteal Phase

Date of Conception If you know when conception occurred

Expected Due Date Enter due date given by your doctor

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Calculate Your Due Date

Enter your last menstrual period date or conception date to see your pregnancy timeline and due date.

🤰 Pregnancy Calculator Report

Generated by Kambrain.com • Your Trusted Pregnancy Tracker

Estimated Due Date

Days Left

Weeks Left

Months Left

Pregnancy Progress Week --

Week 1 Week 13 Week 27 Week 40

🌱 First Trimester

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Gestational Age

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Conception Date

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Baby is the size of a grape

Length: ~2.3 cm | Weight: ~2 grams

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First Ultrasound (8-12 weeks)

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Anatomy Scan (18-22 weeks)

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Full Term (37 weeks)

What is a Pregnancy Calculator?

A Pregnancy Calculator is a specialized tool that helps expectant mothers and families determine their estimated due date, current week of pregnancy, and track important milestones throughout the pregnancy journey. Using medically-accepted formulas, our Pregnancy Calculator provides accurate estimates based on either your last menstrual period (LMP), conception date, or a known due date.

The Kambrain Pregnancy Calculator uses Naegele's Rule, the standard method used by healthcare providers worldwide to estimate due dates. This calculation adds 280 days (40 weeks) to the first day of your last menstrual period, adjusted for your individual cycle length. According to the American College of Obstetricians and Gynecologists (ACOG), this method provides reliable estimates when combined with ultrasound confirmation.

💡 Did You Know? Only about 5% of babies are born on their exact due date. Most babies arrive within two weeks before or after the calculated date. Our Pregnancy Calculator gives you an estimated date — your healthcare provider can give you the most accurate prediction based on ultrasound measurements.

Why Use a Pregnancy Calculator Online?

Knowing your due date is essential for planning prenatal care, preparing for your baby's arrival, and understanding your pregnancy journey. Here's why millions of expectant parents use our free Pregnancy Calculator:

Instant Results: Get your due date, current week, and trimester information immediately
Multiple Methods: Calculate using LMP, conception date, or known due date
Personalized Timeline: See key milestones and development stages for your specific pregnancy
Week-by-Week Guide: Learn what's happening with your baby at each stage
100% Private: All calculations happen in your browser — no data is stored or shared
Completely Free: No registration, no payment, no limits

While our Pregnancy Calculator provides medically-based estimates, always consult with your healthcare provider for personalized medical advice. Ultrasound dating, especially in the first trimester, offers the most accurate way to confirm your due date.

Pregnancy Calculator Features

Discover the comprehensive features that make our Pregnancy Calculator the most helpful tool for tracking your pregnancy journey.

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Due Date Calculator

Calculate your estimated due date using Naegele's Rule with adjustments for your cycle length and luteal phase for maximum accuracy.

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Week-by-Week Tracking

See exactly which week and day of pregnancy you're in, along with a visual progress bar showing how far along you are.

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Trimester Information

Learn which trimester you're in and get relevant information about what to expect during each stage of pregnancy.

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Baby Size Comparison

Fun comparisons showing your baby's current size using everyday objects like fruits and vegetables.

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Countdown Timer

See exactly how many days, weeks, and months remain until your due date with our live countdown feature.

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Key Milestone Dates

Get important dates for first ultrasound, anatomy scan, full term, and other key pregnancy milestones.

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Multiple Calculation Methods

Calculate using last menstrual period, conception date, or a known due date — whichever you know.

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100% Private

All calculations happen locally in your browser. No data is stored, shared, or transmitted to any server.

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Print Results

Print your pregnancy timeline and due date information to share with family or bring to doctor appointments.

How to Use the Pregnancy Calculator

Using our Pregnancy Calculator is simple and takes just a few seconds. Follow these easy steps to find your due date and pregnancy information:

Step 1: Choose Your Calculation Method

Select one of three calculation methods based on what information you have available:

Last Period: Enter the first day of your last menstrual period (most common method)
Conception Date: Enter the date of conception if you know when it occurred
Due Date: Enter a due date given by your doctor to see your current progress

Step 2: Enter Your Date

Select the appropriate date using the calendar picker. If using the LMP method, you can also adjust your cycle length (default is 28 days) for more accurate results.

Step 3: View Your Results

Click "Calculate Due Date" to instantly see your estimated due date, current pregnancy week, trimester information, baby size, and key milestone dates.

🎯 Tip: For the most accurate results with our Pregnancy Calculator, use the first day of your last menstrual period. If your cycles are irregular, conception date or an ultrasound-confirmed due date may provide better accuracy.

Pregnancy Timeline by Trimester

Understanding each trimester helps you prepare for what's ahead. Here's what to expect during your pregnancy journey.

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First Trimester

The first trimester is a time of rapid development. Your baby's major organs begin to form, and you may experience morning sickness, fatigue, and hormonal changes. This is also when most pregnancy symptoms start and your first prenatal visits occur.

Weeks 1-12

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Second Trimester

Often called the "golden period" of pregnancy, the second trimester typically brings more energy and fewer symptoms. You'll feel your baby's first movements, have the anatomy scan, and start showing a visible baby bump.

Weeks 13-26

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Third Trimester

The home stretch! Your baby gains weight and prepares for birth. You may experience Braxton Hicks contractions, increased fatigue, and nesting instincts. Prenatal visits become more frequent as you approach your due date.

Weeks 27-40

Pregnancy Tips & Advice

Our Pregnancy Calculator is just the beginning of your journey. Here are some helpful tips to support a healthy pregnancy:

Prenatal Care is Essential

Schedule regular prenatal checkups with your healthcare provider. These visits are important for monitoring your health and your baby's development. Don't skip appointments, even if you feel fine.

Nutrition Matters

Eat a balanced diet rich in fruits, vegetables, whole grains, and lean proteins. Take prenatal vitamins with folic acid as recommended by your doctor. Stay hydrated by drinking plenty of water throughout the day.

Stay Active

Regular, moderate exercise during pregnancy can help with energy levels, sleep, and preparing your body for labor. Walking, swimming, and prenatal yoga are excellent choices. Always consult your healthcare provider before starting any exercise program.

Get Enough Rest

Your body is working hard to grow a baby. Listen to your body and rest when needed. Aim for 7-9 hours of sleep per night and take naps when possible, especially during the first and third trimesters.

⚠️ Important: While our Pregnancy Calculator provides helpful estimates based on standard medical formulas, it is not a substitute for professional medical advice. Always consult with your healthcare provider for personalized guidance and medical care during pregnancy.

Looking for more pregnancy resources? Visit our free tools collection or check out our blog for more helpful articles and guides.

Pregnancy Calculator FAQ

Find answers to frequently asked questions about pregnancy due dates, calculations, and using our Pregnancy Calculator.

Our Pregnancy Calculator uses Naegele's Rule, the same method used by healthcare providers. While highly accurate for women with regular 28-day cycles, only about 5% of babies are born on their exact due date. Most babies arrive within 2 weeks of the estimated date. Ultrasound dating provides the most accurate confirmation.

The Pregnancy Calculator adds 280 days (40 weeks) to the first day of your last menstrual period. If your cycle length differs from 28 days, the calculation is adjusted accordingly. This assumes ovulation occurred around day 14 of your cycle.

You can use the conception date method if you know when conception occurred, or enter a due date given by your doctor. An early ultrasound (before 12 weeks) can also accurately determine your due date.

First Trimester (Weeks 1-12): Early development, morning sickness common. Second Trimester (Weeks 13-26): Often the most comfortable period, baby movements begin. Third Trimester (Weeks 27-40): Final growth phase, preparing for birth.

A pregnancy is considered full term at 39-40 weeks. Babies born between 37-38 weeks are "early term," while 41 weeks is "late term." Most healthcare providers will discuss options if pregnancy extends beyond 41 weeks.

Absolutely. All calculations in our Pregnancy Calculator happen locally in your web browser. No personal data, dates, or results are ever stored on servers, transmitted online, or shared with anyone. Your privacy is completely protected.

Yes! For IVF pregnancies, use the conception date method and enter the date of embryo transfer. For a Day 5 blastocyst transfer, add 5 days to calculate. Your fertility clinic can provide the most accurate dates based on your specific cycle.

Pregnancy is counted from the last menstrual period because it's a date most women can remember accurately. While conception actually occurs about 2 weeks later, this standardized starting point allows for consistent tracking and communication between patients and healthcare providers.

A full-term pregnancy is 40 weeks (280 days) from the first day of the last menstrual period. This equals approximately 9 months and 1 week. However, healthy births commonly occur anywhere from 37 to 42 weeks.

Our Pregnancy Calculator provides a helpful estimate, but you should always confirm your due date with your healthcare provider. An early ultrasound (especially before 12 weeks) combined with LMP dating gives the most accurate prediction. Use this calculator as a starting point and reference tool.

Calculate Your Due Date Now

Join millions of expectant parents who use our free Pregnancy Calculator to track their pregnancy journey. It's fast, accurate, and completely private.

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