Pregnancy Calculator

Pregnancy Calculator Tool

We know many women want to use the best tools to help them with their pregnancy. We built a fantastic Pregnancy Calculator that has five different ways to help you calculate your due date and determine how you are progressing. We built it so that it can accomodate all of the expectant mothers and whatever their needs are. Best of all – we made it fast (hopefully not faster your husband – it’s ok, my wife okayed that joke). We are quite excited for you and excited for this time in your life – we hope our calculator can be helpful. We hope our suite of health and fitness tools can help you with whatever your needs may be, including with your pregnancy!

Pregnancy Calculator – Summary and Overview


Pregnancy is a unique time in a woman’s life. It includes a journey filled with treasured moments and exciting times, as she carries another life within her. One aspect that is often of high concern for expectant mothers is the pregnancy due date and ovulation date. The pregnancy calculator makes it easier to estimate these dates accurately. This article delves into the history of measuring pregnancy and ovulation dates, their link, their importance, and some interesting facts.

Quick Summary

  • The history of measuring pregnancy due date and ovulation date.
  • The link between the pregnancy due date and ovulation date.
  • Importance of knowing your pregnancy due date and ovulation date.
  • Common reasons for calculating the due date.
  • Ten surprising facts about measuring pregnancy due date and ovulation date.

History of Measuring Pregnancy Due Date

The notion of a set pregnancy due date started during the 19th century under the influence of German obstetrician, Franz Karl Naegele. He developed a method, known as Naegele’s rule, which estimates the date of delivery by adding one year, subtracting three months, and adding seven days to the date of woman’s last menstrual period.

History of Measuring Ovulation Date

The conception of ovulation date tracking is relatively modern. It wasn’t until the 1920s that scientists fully understood a woman?s menstrual cycle and its link to ovulation. The development of ovulation predictor kits in the 1970s enabled women to estimate the time of ovulation more accurately.

The Link Between Pregnancy Due Date and Ovulation Date

The estimated pregnancy due date is calculated primarily from the day of ovulation. Generally, conception happens approximately two weeks after the first day of the last menstrual period, marking the approximate time of ovulation. Thus, understanding the ovulation date can aid in predicting the pregnancy due date.

The Importance of Knowing Pregnancy Due Date and Ovulation Date

Knowing your pregnancy due date helps you prepare for the birth and allows you to schedule necessary prenatal care. Understanding your ovulation date, on the other hand, can be essential for women who are planning a pregnancy as it points out the most fertile time of the cycle.

Common Reasons to Calculate Your Due Date

  • To get an estimate when the baby might arrive.
  • For scheduling necessary prenatal tests.
  • To identify whether the growth and development of the baby are on track.
  • For planning maternity leave.

Do You Know?

Following are some interesting facts related to measuring pregnancy due date and ovulation date:

  • The biggest baby ever born without a C-section weighed 22 pounds.
  • According to a BBC report, the smallest surviving baby was 8.6 oz.
  • The longest pregnancy ever recorded lasted 375 days.
  • Ovulation usually happens around the 14th day of an average 28-day cycle.
  • An egg only survives for 12-24 hours post-ovulation unless fertilized by sperm.

Remember, these calculations are not perfect, and the actual ovulation and delivery date can differ based on various factors. Always consult with a healthcare professional for accurate dates and guidance.

Zippy Calc Key Benefits

  • FAST

    Optimized for SPEED. We pride ourselves on having FAST calculators available for you. We know you’ve got other important things to do and that’s why we’ve reduced all excess button clicks so you can be in, out, and on your way.


    No charge to you. We get paid and keep the lights on via our advertisers on the site (which we try to make as least intrusive as possible)


    Here’s a tidbit. We include stats and interesting facts alongside of each of our calculators. These may be helpful to you along your way and provide you an insight and link to a resource to help you on your way.


    Chose not to be boring. We’ve found that a lot of our competitors (yes, there are online calculator competitors, can you believe the world we live in) have very BORING websites. We’re not trying to be boring. We want you to have a chuckle.