How to Use the Due Date Calculator

A Due Date Calculator is a digital tool that estimates the expected date of delivery (EDD) based on the first day of a woman’s last menstrual period (LMP).

It provides a quick and helpful way for expecting parents and healthcare professionals to predict when a baby is likely to be born, typically 280 days (or 40 weeks) from the LMP.

Step-by-Step Guide to Using the Calculator

Here’s how to use the calculator on this page:

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Step 1: Select Your LMP Date

• Locate the “First Day of Last Menstrual Period” field.
• Click the calendar icon and select the date when your last period started.
• This date is important—it marks Day 1 of pregnancy, even though ovulation may occur 2 weeks later.

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Step 2: Click “Calculate Due Date.”

• Once your LMP date is selected, click the “Calculate Due Date” button.
• The calculator will instantly compute your estimated due date based on a 280-day gestational period.

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Step 3: View Your Estimated Due Date

• A results box will appear below with your expected delivery date, formatted in a reader-friendly style (e.g., December 10, 2025).

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Why This Calculator Is Useful

• Quick and easy: No need to do math or check charts.
• Accurate baseline: Based on widely used medical standards.
• Embeddable on websites: Perfect for blogs, healthcare portals, and pregnancy resources.

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FAQ: Due Date Calculator

Q1: How accurate is the Due Date Calculator?
A: It provides an estimate based on average pregnancy length. Actual delivery may occur 2 weeks before or after the due date.

Q2: What if I don’t remember my exact LMP?
A: Use the closest date you can remember. For more precision, an ultrasound scan is recommended.

Q3: Can this calculator be used for IVF pregnancies?
A: No. IVF pregnancies use a different method to calculate due dates based on the embryo transfer date.

Q4: Is the due date the exact birth date?
A: Not usually. Only about 5% of babies are born on their exact due date.

Q5: Can I use this calculator on mobile devices?
A: Yes, it’s fully responsive and works on smartphones and tablets.