How is the due date calculated?

Most due dates are calculated based on the first day of your last menstrual period (LMP). It assumes a 28-day cycle and adds 280 days (40 weeks) to that date.

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Pregnancy Due Date Calculator

Estimate your due date and see your current gestational age.

The moment you discover you're expecting, the first question is always: 'When will the baby arrive?' While only about 5% of babies are born exactly on their due date, having an estimated date of arrival is essential for planning, prenatal care, and preparing your home. Our Pregnancy Due Date Calculator provides you with a clear timeline based on the first day of your last period, helping you visualize your journey through the first, second, and third trimesters.

First Day of Last Period

Enter the first day of your last menstrual period to calculate your due date.

Comment ça marche

The tool takes your LMP date and performs date arithmetic to project 40 weeks forward. It also calculates your current 'gestational age' by finding the difference between today's date and your LMP, giving you a real-time progress report.

Formule de calcul

LMP + 280 Days

Calculation Examples

1. **Recent Start**: If your last period began on January 1, your estimated due date would be **October 7** of the same year.

Why use this tool in your daily life?

This tool transforms a abstract concept into a tangible timeline. Knowing your due date allows you to synchronize your life with your baby's development, ensuring you hit every medical and personal milestone with confidence.