Ovulation Calculator

Ovulation Calculator

First Day of Last Period:
Normal Menstrual Cycle Length:
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Ovulation Formula:

Ovulation Date = ~2 weeks before your period

Ovulation Definition

The Ovulation Calculator will calculate your likely ovulation date if you enter in the first day of your last period and your average menstrual cycle length. Also, try out the Due Date Calculator and the Pregnancy Calculator.

How to Calculate Ovulation

Let's be honest - sometimes the best ovulation calculator is the one that is easy to use and doesn't require us to even know what the ovulation formula is in the first place! But if you want to know the exact formula for calculating ovulation then please check out the "Formula" box above.

Add a Free Ovulation Calculator Widget to Your Site!

You can get a free online ovulation calculator for your website and you don't even have to download the ovulation calculator - you can just copy and paste! The ovulation calculator exactly as you see it above is 100% free for you to use. If you want to customize the colors, size, and more to better fit your site, then pricing starts at just $29.99 for a one time purchase. Click the "Customize" button above to learn more!