Use this menstrual cycle calculator to calculate your next menstrual period, fertile period and due date. To give you an estimate please provide the requested information and press the Calculate button (results will be shown below, together with a fertility calendar):

1.

When did your last period start?

2.

How many days did it last?

3.

How long is your cycle?

Calculate

Below are the results based on the information you provided:

Your next menstrual period is expected to start on

Your next most fertile period is from to

If you conceive within this timeframe, your estimated due date will be

Previous 2 MonthsNext 2 Months

  • Pre-Period
  • Period Days
  • Post-Period
  • Peak Ovulation

Please note that this is only an estimation of your menstrual cycle


If you want to stand the best chance of getting pregnant, then you need to know when you are ovulating. This is the time of the month that you are at your most fertile, and thus stand a greater chance of a sperm reaching the egg and fertilizing it. However, one of the biggest problems people have is knowing how to calculate their menstrual cycle. This is where technology can come in handy. You can use tools such as a menstrual cycle calculator which should provide you with a rough estimate about when you are going to ovulate next. Let me tell you a little about how these work.

Menstrual Cycle Calculators vary in complexity. Some will ask you for information such as your average body temperature, as well as various other bits and pieces about what your body is currently going through.

These types of cycle calculators often give the most accurate results, but many people find that they are “over kill”, and the majority of the information that they ask for is not something that people will have to hand readily, especially months of data about the subject. Therefore many women use simpler period calculators, which still give fairly accurate results.

Using a Menstrual Cycle Calculator

The first thing that the menstrual cycle calculator will ask you is the date of your last period. Hopefully this should be information that almost any woman should be able to answer fairly easily. This will be the starting date of the last period and not the ending date.

The next piece of information that you will be asked for is the average length of time between your periods. This is the “length of the menstrual cycle“. Of course, the human body does vary wildly here, and whilst some months there could be 30 days between your period, and others it could be as low as 25.

However, you are only after an average here. Do try to be as accurate as possible though as this will affect the results that you are given, and this of course will have a profound effect on what the calculator tells you is the ideal time to try for a child.

Finally you will be given your results. Generally you will be told the date of your next period, which should be fairly accurate. What you are going to be most concerned with is the next ovulation period. This will be the time that you are at your most fertile and therefore stand the best chance of getting pregnant.

The period calculator above also comes with a fertility calendar. You can navigate through different months by clicking on the NEXT 2 MONTHS and PREVIOUS 2 MONTHS links. This allows you to plan and prepare for your fertile and menstrual periods in the upcoming months.

What you do need to remember though is that the information isn’t 100% accurate as it is impossible to predict the human body, so ideally you would want to start having sex a couple of days before this. You can learn more about the likelihood of conception in this article.

Whilst they aren’t 100% accurate, the menstrual calculator is still a useful tool. It provides a “free” way of knowing when you stand the best chance of getting pregnant, and this of course can be a god send for a couple who is struggling with this.

How To Calculate Your Next Period & Ovulation Infographic

calculate period infographic

Learn more

Want to learn more about your menstrual cycle? Find out how does the Fertility Calculator work or how to to calculate your period manually.

Want to know if you’re pregnant? Take this online pregnancy test, read more about the most common reasons why your period might be late or find out when it’s the best time to take a home pregnancy test.

Do you have a question about your menstrual cycle, ovulation, pregnancy or any other related topic? Check out our Frequently Asked Questions page.

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