Ovulation Predictor / DDLady

NEW: Check our new Period and fertility calendar!

Here is a free ovulation predictor / due date calculator ("DDLady") script. It's free to use right on this page. The calculator will show you your most fertile dates based on your period length and last period date. It will also suggest when your next period is expected to start.

Webmasters can download it from this link and install it on their sites. See how the calculator looks and works below:

Please select the first day of your last menstrual period:

/ /

Usual number of days in your cycle:

Questions & Comments

This due date and ovulation calculator is fully functional. If you want to check your most fertile period and due date, you can do it right on this page. There is no need to install anything. The instructions below are for webmasters who want to use the tool on their websites.

Don't forget that date-based ovulation prediction isn't perfect. If you want more precise methods you may need to use some kits, measure your basal body temperature and so on. If you want to read more on the topic, continue here.

Ovulation Predictor For Webmasters

Once downloaded the above script, unzip it and upload it somewhere in your web host. It's just one single PHP file so all you need to do is to upload it. Then put the following PHP code in your web page:


That's all! Note that if you put the calculator in a folder, you need to give the relative path to it.

You can customize the CSS and the design by directly modifying the PHP code in the script. Some very basic PHP knowledge may be needed to avoid messing the code.

This ovulation predictor script is completely free and you can do everything you want in it. There are no obligations at all. There is a link at the bottom, but if you wish to remove it, that's ok (I will however appreciate if you leave it there as is).

Ovulation Predictor Wordpress Plugin

This calculator is now available also as wordpress plugin. You can find it here.

If you are looking for similar scripts online check this investment calculator and our overweight calculator.

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