Or use the date picker above

Features

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Fast Calculation
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Pregnancy Week
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Trimester Info
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Countdown Timer
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Recent Queries
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Responsive Layout
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Privacy Protected
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Beautiful Design

About Pregnancy Due Date Calculator

Our free online pregnancy due date calculator helps you determine your estimated due date (EDD) based on your last menstrual period (LMP). This tool uses the standard Naegele's rule, which is the most commonly used method by healthcare providers worldwide.

This comprehensive pregnancy calculator is perfect for:

  • Calculating your estimated due date from your last menstrual period
  • Finding out which pregnancy week you're currently in
  • Determining which trimester you're in (first, second, or third)
  • Counting down the days until your due date
  • Tracking your pregnancy progress with a visual timeline
  • Understanding your gestational age in weeks and days
  • Planning ahead for your baby's arrival
  • Sharing your due date with family and friends

How It Works: The calculator uses Naegele's rule, which adds 280 days (40 weeks) to the first day of your last menstrual period. This is the standard method used by obstetricians and midwives to estimate your due date.

Important Note: Only about 5% of babies are born exactly on their due date. Most babies are born within two weeks before or after the estimated due date. Your healthcare provider may adjust your due date based on ultrasound measurements, especially if there's a significant difference from the LMP-based calculation.

Pregnancy Trimesters: Pregnancy is divided into three trimesters, each lasting approximately 13-14 weeks. The first trimester is weeks 1-13, the second trimester is weeks 14-27, and the third trimester is weeks 28-40.

All calculations are performed locally in your browser, ensuring complete privacy and security. No data is collected, stored, or transmitted to any server.

Frequently Asked Questions

How do I calculate my pregnancy due date?

Enter the first day of your last menstrual period (LMP) into the calculator, then click 'Calculate Due Date'. The calculator uses the standard Naegele's rule: LMP + 9 months + 7 days (or LMP + 280 days) to determine your estimated due date.

Is the pregnancy due date calculator free?

Yes, our pregnancy due date calculator is completely free to use. No registration, no fees, and no hidden costs.

Is my data private?

Yes, all calculations are performed locally in your browser. We don't collect, store, or transmit any of your personal information.

How accurate is the due date calculator?

The calculator uses the standard medical formula (Naegele's rule) which is accurate for most pregnancies. However, only about 5% of babies are born exactly on their due date. Most babies are born within two weeks before or after the due date.

What is the last menstrual period (LMP)?

LMP is the first day of your last menstrual period before you became pregnant. This is the date most commonly used by healthcare providers to calculate your due date and track your pregnancy progress.

Can I use this on mobile devices?

Absolutely! Our pregnancy due date calculator is fully responsive and works perfectly on desktop, tablet, and mobile devices.

What if I don't know my exact LMP date?

If you're unsure of your exact LMP date, try to estimate as closely as possible. You can also use the quick date buttons (7 days ago, 14 days ago, etc.) to help you select a date. Remember, an early ultrasound can provide a more accurate due date if your LMP is uncertain.

How is pregnancy week calculated?

Pregnancy weeks are calculated from the first day of your last menstrual period, not from conception. This is the standard method used by healthcare providers. Week 1 starts on the first day of your LMP, and week 40 is your estimated due date.

What are the three trimesters?

Pregnancy is divided into three trimesters: First trimester (weeks 1-13), second trimester (weeks 14-27), and third trimester (weeks 28-40). Each trimester has different developmental milestones and experiences.

Can I save my queries for quick access?

Yes! Our calculator automatically saves your last 3 queries. You can quickly switch between them using the "Recent Queries" section at the top. All data is stored locally in your browser for privacy.