Estimated Date of Delivery Calculator

Calculation Method: Last Menstrual Period (LMP) Conception Date Ultrasound Date

First Day of Last Menstrual Period:

Please enter a valid date

Average Length of Cycles: 28 days (average) 21 days 22 days 23 days 24 days 25 days 26 days 27 days 29 days 30 days 31 days 32 days 33 days 34 days 35 days

Date of Conception:

Please enter a valid date

Date of Ultrasound:

Please enter a valid date

Gestational Age at Ultrasound (weeks):

Please enter a value between 6 and 20

Your Estimated Due Date

January 1, 2023

You are currently 10 weeks pregnant

You are in your 1st trimester

280 days left until your due date

Understanding Due Date Calculation

Your estimated due date (EDD) is calculated based on your last menstrual period, conception date, or ultrasound measurements. A typical pregnancy lasts about 40 weeks from the first day of your last menstrual period.

Last Menstrual Period Method

Adds 280 days (40 weeks) to the first day of your last period, assuming a 28-day cycle.

Conception Date Method

Adds 266 days (38 weeks) to your conception date.

Ultrasound Method

Uses measurements from early ultrasound to determine gestational age and calculate due date.

The Estimated Date of Delivery Calculator helps expectant mothers find out when their baby might be born. By using the first day of your last menstrual period (LMP), this tool gives you a quick and simple estimate of your due date.

What is EDD?

EDD stands for Estimated Date of Delivery. It is the expected date when a baby is most likely to be born. A full-term pregnancy usually lasts around 40 weeks or 280 days from the first day of the woman’s last period.

How EDD is Calculated

EDD = First Day of Last Menstrual Period + 280 days (or 40 weeks)

This calculation is based on the Naegele’s rule, which assumes a regular 28-day cycle. If your cycle is different, your actual due date might vary slightly.

Why Knowing Your EDD is Important

Knowing your expected delivery date helps you plan doctor visits, prepare for the baby’s arrival, and track important stages in your pregnancy. It also helps healthcare providers monitor your baby’s growth and make medical decisions if needed.

How to Use the EDD Calculator

To use the Estimated Date of Delivery Calculator, simply enter the first day of your last menstrual period. The tool will instantly calculate your due date and show it clearly. You don't need to register or pay anything — it's a free tool without any $ charge.

Things to Remember

• EDD is just an estimate — babies often arrive a bit earlier or later.
• Your doctor may suggest another due date based on ultrasound results.
• Only about 5% of babies are born exactly on their due date.

Conclusion

The EDD Calculator is a helpful tool for every expecting parent. It gives you an idea of when to expect your baby, so you can be more prepared. Start tracking your pregnancy journey with this easy and free calculator today.