Due Date Calculator

If you know you’re pregnant, the next obvious question is, what is the pregnancy due date? Human beings have a gestation period of nine months for a typical healthy pregnancy, although the total cycle is counted as ten months. Pregnancy due dates are estimated by starting from the first day of your last menstrual cycle and going forward 40 weeks (about ten months).

Due Date Calculator
When was the first day of your last menstrual period?

Number of days in your menstrual cycle

Likely conception date:
End of first trimester (12 weeks):
End of second trimester (27 weeks):
Your due date (40 weeks):
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One thing to consider is that the accuracy of this calculation is by no means exact. Rather than a birth date, think of it as a birth month. A factor that can cause variation is whether or not your menstrual cycles were regular before you were pregnant. If not, be sure to mention it to your doctor or midwife. Even so, a pregnancy due date calculator like the one on this page can be a helpful tool to determine about when you should expect the new delivery to your life. Keep in mind that your doctor or midwife will do their own estimation, and it may or may not match yours.