Pregnancy Due Date Calculator

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First Day of Last Menstrual Period (LMP)

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Estimated Due Date

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Weeks Pregnant Today

How to Use Pregnancy Due Date Calculator

Enter the first day of your last menstrual period.
Click Calculate Due Date.
View your estimated due date and current week of pregnancy.

Features

🎯

Naegele's rule formula

⚡

Instant results

🔒

Private

📱

Mobile friendly

Frequently Asked Questions

Is it free?

Yes.

How accurate is this estimate?

It's a standard obstetric estimate (280 days from LMP); actual delivery dates vary — always confirm with your doctor.

Does it store my data?

No, everything is calculated locally in your browser.

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How is the due date calculated?

Using Naegele's rule: 280 days (40 weeks) are added to the first day of your last menstrual period.

Is my baby's due date exact?

No, it's an estimate — only about 5% of babies are born exactly on their due date.

What if I know my conception date instead?

You can approximate LMP as 2 weeks before your conception date for this calculator.

How to Use Pregnancy Due Date Calculator

Features

Naegele's rule formula

Instant results

Private

Mobile friendly

Frequently Asked Questions

🤖 Ask AI about this tool

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Pregnancy Due Date Calculator

How to Use Pregnancy Due Date Calculator

Features

Naegele's rule formula

Instant results

Private

Mobile friendly

Frequently Asked Questions

🤖 Ask AI about this tool

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