Pregnancy Due Date Calculator


  1. Tell us when is the first day of your last menstrual period?
  2. Press “Calculate” button to indicate your pregnancy.

There are a few ways to calculate how far along you are in your pregnancy, and it’s just a big mess trying to use the various counting methods to predict your child’s due date. So here we will go over just briefly the technique used to count, so that you understand how the due date calculator we’re recommending works.

Last Menstrual Period (LMP): This is the most common marker for counting. Although it is obviously impossible, it counts the first day of your last period as the first day of your pregnancy. However, it allows estimation for your due date by simply adding 40 weeks to the date of your “first day of pregnancy”.

The method that this pregnancy due date calculator uses is the first one. It approximates the date of conception from your LMP and even tells you when would be a good time to take a pregnancy test based on that. Keep in mind that most women deliver +/- 7 to 14 days of their predicted due date.

This test does not only calculate your due date but also the end of each trimester so that it’s easier to follow your child’s development.

In addition, it provides predictions for when you will first be able to detect your baby’s heartbeat and first feel your baby moving.

When you do use the calculator, you will find at the bottom of the page a description of your baby’s current stage of development as well. But if you want a rough guideline highlighting important weeks throughout the term as well, here it is:

  • At 6 weeks, you should be able to detect your baby’s heartbeat. The test also calculates the date for this.
  • At 10-12 weeks, you will most likely take your first trimester screening test. It will help detect chromosomal abnormalities like Down Syndrome and other defects.
  • At 18-20 weeks, another screening called anatomic sonogram is usually conducted to see if there are any malformations.
  • At 22 weeks, the doctor should assess you for risks of premature delivery.
  • At 26 weeks, your glucose level may be tested to screen for diabetes.
  • At 28 weeks and beyond, your baby’s healthy survival is quite good, should you have to deliver preterm.