Pregnancy Due Date Calculator
Estimate your baby's due date based on the first day of your last menstrual period.
- Click the date input field and select the first day of your last menstrual period (LMP).
- Press the 'Calculate Due Date' button.
- Our online tool will instantly provide you with your estimated due date, your current gestational age (how many weeks pregnant you are), and a progress bar. This service is completely free.
help_outlineHow to Use the Free Online Due Date Calculator
Click the date input field and select the first day of your last menstrual period (LMP).
Press the 'Calculate Due Date' button.
Our online tool will instantly provide you with your estimated due date, your current gestational age (how many weeks pregnant you are), and a progress bar. This service is completely free.
Frequently Asked Questions
How is the due date calculated?
This calculator uses Naegele's rule, a standard method for estimating a due date. It works by adding 280 days (40 weeks) to the first day of your last menstrual period (LMP). This assumes a regular 28-day cycle.
How accurate is this due date?
This is an estimate. Only about 5% of babies are born on their exact due date. Your healthcare provider may give you a more accurate date based on an ultrasound. This online calculator is a great starting point, but is for informational purposes only.
Is this calculator free and private?
Yes, this is a 100% free online tool. All calculations are done in your browser, and none of your personal health information is stored or transmitted.
About the Pregnancy Due Date Calculator
What is the Pregnancy Due Date Calculator?
Our Pregnancy Due Date Calculator is a free, online tool designed to estimate your baby's expected delivery date (EDD). Based on the first day of your last menstrual period (LMP) or, for IVF pregnancies, the date of embryo transfer, our calculator provides a probable due date using Naegele's Rule, the most commonly used method in obstetrics. Forget manually counting 40 weeks! This tool instantly gives you a date in various formats (MM/DD/YYYY, DD/MM/YYYY, and more) for easy sharing with your healthcare provider. Planning for a new arrival just got a whole lot easier, allowing you to focus on preparing for your little one.
How Does It Work?
Determining your estimated due date has never been simpler. Our Pregnancy Due Date Calculator requires only one piece of information: the first day of your last menstrual period (LMP). If you underwent IVF, you can input the embryo transfer date instead. Simply select the date from the calendar provided or manually enter it in the correct format. Click the "Calculate" button, and within milliseconds, you'll receive your estimated due date. No complex forms, no lengthy questionnaires - just instant results to help you start planning!
Key Benefits of Using Our Online Tool
- Instant Results: Get your estimated due date immediately, saving you time and effort compared to manual calculations or waiting for a doctor's appointment.
- Multiple Date Formats: View your due date in various formats, making it easy to share with family, friends, and your OB/GYN.
- IVF Pregnancy Support: Accurately estimate your due date even if you conceived through in vitro fertilization by using the embryo transfer date.
- Completely Free and Accessible: Our tool is available 24/7, free of charge, on any device with an internet connection.
Is it Legal and Safe?
Yes, using our Pregnancy Due Date Calculator is completely legal and safe. The tool operates entirely within your web browser, meaning no personal information is stored on our servers. Your privacy is our priority. The calculation is performed using standard obstetric formulas (Naegele's Rule) and does not require any sensitive data input beyond the LMP or embryo transfer date. Remember, this tool provides an estimate; consult with your healthcare provider for a more accurate and personalized assessment of your pregnancy and due date.
Why Choose Our Pregnancy Due Date Calculator?
Lightning Fast
Instant results — no waiting, no queues, no page reloads.
Works on All Devices
Phone, tablet, or desktop — same smooth experience everywhere.
High Quality Output
No watermarks, no artificial limits. Pure, accurate results every time.
100% Secure & Private
No login required. Files processed in-browser — never sent to our servers.