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Ovulation calculator
Your fertile window, ovulation day and next periods.
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- Works on any device
About Ovulation calculator
Using your last period and cycle length, estimate your ovulation day, fertile window and next periods. Ovulation usually occurs about 14 days before the next period, not necessarily on day 14. The fertile window covers the five days before ovulation and the day itself.
How to use Ovulation calculator
- Enter the first day of your last period.
- Enter your usual cycle length.
- Read your fertile window, ovulation day and next periods.
Why use this tool?
- Private: everything happens in your browser. Nothing you enter is uploaded.
- Free, with no sign-up, no watermark and no limit on how often you use it.
- Works on phones, tablets and computers: Android, iPhone, Windows, Mac and Linux. Nothing to install.
- Free to embed on your own website, with a ready-made code to copy.
- Available in 10 languages.
Also known as
Frequently asked questions
When is the most fertile day of the cycle?
The two days before ovulation and the day of ovulation are the most fertile. Sperm can survive up to five days.
What if my cycle is irregular?
The result is less reliable when cycle length changes from month to month. Use the average of recent cycles, and consider tracking temperature or test strips too.
Can I use this for contraception?
No. It is an estimate based on averages and cannot prevent pregnancy. Use a proven method of contraception.
Is Ovulation calculator free?
Yes. Ovulation calculator on Toolipedia is free to use, with no sign-up and no watermark.
Is it safe to use?
Yes. Everything is worked out in your browser, and nothing you enter is sent to our server.
Does it work on my phone?
Yes. It works in any modern browser on Android and iPhone, as well as on tablets and computers. There's nothing to install.
Do I need an account?
No. Just open the page and use the tool. There's no sign-up and no email needed.
Can I put Ovulation calculator on my own website?
Yes. Use the Embed on your site button under the tool to copy a short piece of code and paste it into your page. It is free, needs no account, and the tool keeps working inside your page.