Free to Use

Pregnancy Calculator

Calculate your due date, track pregnancy weeks, monitor fetal development milestones, and plan your pregnancy journey with our comprehensive pregnancy calculator tools

Due Date
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Estimated delivery date
Current Week
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Weeks + days pregnant
Days Pregnant
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Total days since conception
Trimester
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Current trimester

Important Pregnancy Milestones

Weeks Pregnant
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Weeks and days
Days Pregnant
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Total days
Days Remaining
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Until due date
Progress
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Pregnancy complete
Conception Date
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Estimated conception
Fertile Window
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Most likely conception period
Calculated Due Date
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From conception date
Gestational Age
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From LMP

Your Pregnancy Journey Timeline

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Pregnancy Calculator Features

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Due Date Calculation
Calculate your estimated due date based on your last menstrual period with 99% accuracy using Naegele's rule.
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Pregnancy Weeks Tracker
Track exactly how many weeks and days pregnant you are with real-time calculations and progress monitoring.
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Conception Calculator
Estimate conception date and fertile window based on due date or calculate due date from known conception date.
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Pregnancy Milestones
Get a complete timeline of important pregnancy milestones, appointments, and fetal development stages.
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Mobile Friendly
Access your pregnancy calculations on any device with our responsive design that works perfectly on mobile.
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Privacy Protected
All calculations are performed locally in your browser. Your pregnancy information remains completely private.

How to Use Our Pregnancy Calculator

Due Date Calculator

Enter the first day of your last menstrual period (LMP) and your average cycle length. The calculator uses Naegele's rule to estimate your due date, which adds 280 days (40 weeks) to your LMP date.

Pregnancy Weeks Calculator

Input your current date and LMP date to see exactly how many weeks and days pregnant you are. This helps track your pregnancy progress and plan upcoming appointments.

Conception Calculator

If you know your conception date, enter it to calculate your due date. Alternatively, enter your due date to estimate when conception likely occurred and your fertile window.

Pregnancy Milestones

Enter your due date to generate a complete timeline of important pregnancy milestones, including when to schedule appointments and expect major developments.

Pregnancy Calculation Formulas

Naegele's Rule (Due Date Calculation)
Due Date = LMP + 280 days (40 weeks)

The most widely used method for calculating due dates, adding 280 days to the first day of the last menstrual period.

Gestational Age Calculation
Gestational Age = Current Date - LMP Date

Calculates how many weeks and days pregnant you are from the last menstrual period date.

Conception Date Estimation
Conception Date = LMP Date + (Cycle Length - 14) days

Estimates conception date by adding the difference between cycle length and 14 days to the LMP date.

Understanding Pregnancy Trimesters

First Trimester (Weeks 1-12)

The first trimester is crucial for fetal development. Major organs begin to form, and you may experience morning sickness, fatigue, and breast tenderness. Important appointments include confirming pregnancy and first prenatal visit.

Second Trimester (Weeks 13-26)

Often called the "golden period" of pregnancy. Morning sickness typically subsides, energy returns, and you'll feel the baby's first movements. Anatomy scan usually occurs around week 20.

Third Trimester (Weeks 27-40)

The final stretch before delivery. The baby grows rapidly, and you may experience increased discomfort. Important preparations include birth plan, hospital bag, and final prenatal appointments.

Pregnancy Health Tips

Prenatal Care

Regular prenatal checkups are essential. Schedule your first appointment within 8 weeks of your LMP. Follow your healthcare provider's recommended appointment schedule.

Nutrition & Supplements

Take prenatal vitamins with folic acid, eat a balanced diet rich in fruits and vegetables, and stay hydrated. Avoid alcohol, smoking, and high-mercury fish.

Exercise & Rest

Moderate exercise is beneficial during pregnancy. Aim for 30 minutes of activity most days. Get adequate sleep and rest when your body needs it.

Monitoring Symptoms

Track important symptoms and movements. Contact your healthcare provider for severe symptoms like heavy bleeding, severe headaches, or decreased fetal movement.

Frequently Asked Questions (FAQ)

How accurate is the due date calculator?
Our due date calculator uses Naegele's rule, which is the medical standard with approximately 80% accuracy within 2 weeks of the calculated date. Only about 5% of babies are born on their exact due date, with most deliveries occurring within 2 weeks before or after.
What if I don't know my exact LMP date?
If you don't remember your exact LMP date, try to estimate as closely as possible. Your healthcare provider can also use ultrasound measurements, especially in early pregnancy, to more accurately determine gestational age and due date.
How is gestational age different from fetal age?
Gestational age is calculated from your LMP date and includes the 2 weeks before conception occurred. Fetal age (conception age) is about 2 weeks less than gestational age and represents the actual time since conception.
Can the due date change during pregnancy?
Yes, your due date may be adjusted based on ultrasound measurements, especially if there's a significant difference between the calculated date and ultrasound findings. Early ultrasounds (before 20 weeks) are most accurate for dating.
What if my cycle length is irregular?
For irregular cycles, the due date calculation may be less accurate. In these cases, your healthcare provider will likely rely more heavily on ultrasound measurements to determine gestational age and due date.
When should I schedule my first prenatal appointment?
Most healthcare providers recommend scheduling your first prenatal appointment between 6-8 weeks of pregnancy (based on your LMP). However, you should contact your provider as soon as you confirm pregnancy to discuss timing.
How often will I have prenatal appointments?
Typically, appointments are monthly until 28 weeks, then every 2 weeks until 36 weeks, and weekly until delivery. High-risk pregnancies may require more frequent monitoring.
What's the difference between conception date and LMP?
LMP is the first day of your last menstrual period, while conception typically occurs about 2 weeks later during ovulation. Medical dating uses LMP because it's easier to determine accurately than the exact conception date.
Can I use this calculator for IVF pregnancies?
For IVF pregnancies, the conception date is known precisely. Your fertility clinic will provide specific dating based on embryo transfer date. This calculator is most accurate for natural conception pregnancies.
What should I do if I'm past my due date?
Most pregnancies naturally go to 42 weeks. Your healthcare provider will monitor you closely after 40 weeks and may discuss induction options. Always follow your provider's recommendations for monitoring and delivery timing.

About This Pregnancy Calculator

Our comprehensive pregnancy calculator provides expectant mothers with accurate, medically-based calculations for tracking their pregnancy journey. Whether you're newly pregnant or well into your pregnancy, our tools help you understand important dates and milestones.

Why Choose Our Pregnancy Calculator?

🏥 Medical Accuracy

Uses standard medical formulas including Naegele's rule, ensuring calculations align with what your healthcare provider uses.

📱 Comprehensive Tools

Four different calculators in one platform: due date, pregnancy weeks, conception, and milestone tracking.

🔒 Privacy First

All calculations are performed in your browser. No personal information is stored or shared.

💡 Educational Value

Learn about pregnancy stages, important milestones, and what to expect throughout your journey.

📅 Timeline Planning

Generate detailed timelines for appointments, tests, and important pregnancy milestones.

🆓 Always Free

Complete access to all pregnancy calculation tools with no registration required.

Important Medical Disclaimer: This pregnancy calculator is for informational purposes only and should not replace professional medical advice. Always consult with your healthcare provider for personalized pregnancy care, monitoring, and medical decisions. Due dates are estimates, and actual delivery dates can vary significantly.