Free Menstrual Cycle Calculator
Predict your next periods, fertile window, and ovulation date based on cycle length. Free, fast, and works entirely in your browser with no sign-up required.
Menstrual Cycle Calculator
Predict your next 3 periods, fertile windows, and ovulation dates based on your cycle length. Includes a color-coded calendar view for the next 3 months.
Cycle Information
Typically 21–35 days
Typically 3–7 days
Cycle 1
Cycle 2
Cycle 3
June 2026
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Frequently Asked Questions
How accurate is the cycle calculator?
The calculator uses average cycle math. Actual cycles vary due to stress, health, and hormonal changes.
What is the fertile window?
The fertile window is typically the 5 days before ovulation and ovulation day itself, when pregnancy is possible.
Is it free?
Yes, completely free.
Is my data safe with this tool?
Absolutely. The Menstrual Cycle Calculator processes everything client-side in your browser. No data is uploaded to or stored on any server. Your content remains private on your device at all times.
Does the Menstrual Cycle Calculator work on mobile devices?
Yes, the Menstrual Cycle Calculator is fully responsive and works on smartphones and tablets. You can use it on any device with a modern web browser -- no app download required.
Do I need to create an account to use this tool?
No account or registration is needed. Simply open the Menstrual Cycle Calculator in your browser and start using it immediately. There are no sign-up walls or usage restrictions.
How do I use the Menstrual Cycle Calculator?
Simply enter your input in the provided field, adjust any settings to your preference, and the tool will process it instantly. You can then copy the result to your clipboard or download it.
Which browsers are supported?
The Menstrual Cycle Calculator works in all modern browsers including Chrome, Firefox, Safari, Edge, and Opera. For the best experience, use the latest version of your preferred browser.
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About Free Menstrual Cycle Calculator
Free Menstrual Cycle Calculator is a free, browser-based tool in our Calculator Tools collection. Everything runs locally on your device — no uploads, no sign-up, and your data stays private.