My Baby Due Calculator

Pregnancy due date calculators help estimate when a baby is expected to be born based on the first day of the last menstrual period (LMP). This tool provides a quick and easy way to determine your estimated due date, which is typically calculated as 40 weeks (280 days) after the first day of your last menstrual period.

How to Use This Calculator

Using our pregnancy due date calculator is simple:

Enter the date of your first day of your last menstrual period (LMP)
Click the "Calculate" button
Review your estimated due date and other pregnancy milestones

The calculator will show you your estimated due date, as well as important pregnancy milestones like your expected conception date and the beginning of each trimester.

How Pregnancy Due Date is Calculated

The standard method for calculating pregnancy due date is to add 280 days (40 weeks) to the first day of your last menstrual period. This is based on the average length of a full-term pregnancy.

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.

Keep in mind that this is an estimate. Actual due dates can vary by several days or more, and some pregnancies may be shorter or longer than 40 weeks.

Example Calculation

Let's look at an example to see how the calculator works:

If your last menstrual period started on May 15, 2023:

Estimated due date: February 12, 2024
Expected conception date: March 15, 2023
First trimester ends: August 12, 2023
Second trimester ends: November 10, 2023

This example shows how the calculator breaks down the pregnancy into trimesters and provides key milestones.

Frequently Asked Questions

Is the due date calculator accurate?

The due date calculator provides an estimate based on the average length of pregnancy. Actual due dates can vary by several days or more, and some pregnancies may be shorter or longer than 40 weeks.

Can I use this calculator for a pregnancy that started with conception?

Yes, you can use the calculator by entering the date of your last menstrual period. The calculator will then estimate your due date based on the standard 40-week pregnancy length.

What if I don't know my exact last menstrual period date?

If you're unsure of your exact last menstrual period date, you can estimate based on your menstrual cycle length. Most women have cycles that are 28 days long, but some may be shorter or longer.

How do I know if my pregnancy is on track?

Regular prenatal checkups with your healthcare provider are the best way to monitor your pregnancy. Your healthcare provider can track your baby's growth and development, as well as monitor your health.