Calculator Baby Due

Calculating your baby's due date is an important part of pregnancy planning. This calculator helps you determine your estimated due date based on your last menstrual period or ultrasound date. Understanding your due date can help you track your pregnancy progress and prepare for the arrival of your baby.

How to Use This Calculator

Using our baby due date calculator is simple. You can calculate your due date in two ways:

Based on your last menstrual period (LMP): Enter the first day of your last menstrual period and the calculator will estimate your due date by adding 40 weeks (280 days) to that date.
Based on an ultrasound date: If you've had an ultrasound, enter the date of the ultrasound and the number of weeks your baby was at that time. The calculator will then estimate your due date.

After entering the required information, click the "Calculate" button to see your estimated due date. The calculator will also show you your current pregnancy week and the range of dates you fall into.

How the Due Date Calculation Works

The standard calculation for a baby's due date is based on the assumption that a full-term pregnancy lasts 40 weeks (280 days) from the first day of the last menstrual period. This is known as the LMP method.

Formula: Due Date = Last Menstrual Period + 280 days

For example, if your last menstrual period started on January 1, 2023, your due date would be October 31, 2023.

For pregnancies where an ultrasound has been performed, the calculation is based on the number of weeks the baby was at the time of the ultrasound. The formula is:

Formula: Due Date = Ultrasound Date + (40 - Ultrasound Weeks) weeks

For example, if you had an ultrasound at 12 weeks and the date was March 15, 2023, your due date would be March 15, 2023 plus (40 - 12) weeks, which is December 22, 2023.

It's important to note that these calculations are estimates. Your actual due date may vary by a few days or weeks.

Example Calculation

Let's look at an example to see how the calculator works. Suppose you're using the LMP method and your last menstrual period started on May 10, 2023.

Enter "May 10, 2023" as your last menstrual period date.
Click the "Calculate" button.
The calculator will add 280 days to May 10, 2023, resulting in a due date of February 28, 2024.
The calculator will also show you that you're in your 28th week of pregnancy.

This example shows how the calculator can help you track your pregnancy progress and prepare for the arrival of your baby.

Frequently Asked Questions

How accurate is the due date calculator?: The due date calculator provides an estimate based on standard pregnancy lengths. Actual due dates may vary by a few days or weeks.
Can I use this calculator for multiple pregnancies?: Yes, you can use this calculator for each pregnancy separately by entering the appropriate dates for each pregnancy.
What if I don't know my last menstrual period date?: If you don't know your last menstrual period date, you can use the ultrasound method by entering the date of your ultrasound and the number of weeks your baby was at that time.
Is the due date calculator free to use?: Yes, the due date calculator is free to use and does not require any registration or payment.
Can I save my due date calculation?: Currently, the calculator does not save your calculations. You can bookmark this page or take a screenshot of your results for future reference.