Pregnancy Calculator

To understand how the calculator works, follow the instructions below.

First, write down the last date of your menstrual period and your menstrual cycle's number of days on the lines of the calculator and turn it on.

Second, if necessary use the optional calculations to know precisely at which pregnancy stage you are. According to Women's Health magazine, a menstrual cycle includes on average 28 days; however, in some cases, it can be as little as 22 days or even long as 44 days.

Our innovative Pregnancy Calculator takes your menstrual cycle into consideration when calculating your conception or due date. You will need to enter the number of days in your menstrual cycle to get accurate results. If you have forgotten to make calculations on your own because of work or other activities, the Pregnancy Calculator seems to be a perfect assistant for you.

When was the first day of your last menstrual period?


How many weeks will you be pregnant on a given date?


On which date will you be pregnant for the given number of weeks?

Given the birthday or due date, calculate the most likely conception date



1. Committee opinion no 611: method for estimating due date. Obstet Gynecol. 2014 Oct; 124(4):863-866.

2. Moore KL, Persaud TVN, Torchia MG. Before we are born: Essentials of embryology and birth defects. 8th. USA: Elsevier Sanuders; 2013.

You may also be interested in our Pregnancy Weight Gain Calculator

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