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Know what's coming. Feel in control.
Your free, private period & ovulation calculator. No account needed.
🔒 We don't sell your data. Everything stays on your device.
Step 1 of 2Your last period
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When did your last period start?
The first day of bleeding, not spotting.
Quick pick:
🔒 We don't sell your data. Everything stays on your device.
Everything you need to know your cycle
Science-backed estimates, delivered with warmth.
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Next Period Date
Accurate prediction based on your personal cycle length.
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Ovulation Window
Know when you're most likely to ovulate, personalized to you.
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Fertile Window
Your 7-day fertile window, calculated with your luteal phase.
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3-Month Forecast
See your next three cycles at a glance with interactive calendar.
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100% Private
No account. No tracking. Everything lives in your browser.
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Calendar Export
Add your cycle dates to Google, Apple, or Outlook Calendar.
Estimates only — not medical advice. Consult a healthcare provider for medical concerns.