Free cycle tool

my mimi Period Tracker

Estimate your next period, fertile window and ovulation date using your own cycle details.

Period Fertile window Ovulation

Your details

Enter your most recent period and your usual cycle details. Your tracker inputs are saved in this browser only.

Last period start date

Average cycle length

Period length

Calendar file reminder

Calendar note

Summary

Next period —

Ovulation estimate —

Fertile window —

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Add to your calendar

Use the calendar file for iPhone, Apple Calendar, Outlook or supported Android calendar apps. Use Google Calendar for Android/Google accounts.

Upcoming predictions

How these dates are estimated

Dates are based on your last period start, average cycle length and period length. Ovulation is estimated around 14 days before your next period, but your cycle may vary.

Your tracker inputs are saved in this browser only. If you download/share a calendar file or open Google Calendar, that exported reminder is handled by your device or calendar provider.

This tracker provides general cycle estimates only. It should not be used as contraception, fertility advice or medical advice.