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Period and menstrual cycle calculator
Predict your next periods, ovulation day and fertile window from your last period and cycle length, for six cycles ahead.
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- Works on any device
About Period and menstrual cycle calculator
Enter the first day of your last period and your usual cycle length to predict the next six periods, with ovulation and fertile days for each. Cycle length is counted from the first day of one period to the first day of the next. Irregular cycles make predictions less reliable.
How to use Period and menstrual cycle calculator
- Enter your numbers above.
- The result updates instantly as you type.
- Change any value to compare different cases.
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.
- Available in 10 languages.
Also known as
Frequently asked questions
How is menstrual cycle length counted?
From the first day of one period to the day before the next period begins. Most cycles are between 21 and 35 days.
Is Period and menstrual cycle calculator free?
Yes. Period and menstrual cycle 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.