Menstruation Detection & Cycle Tracker

Your Cycle Basics

Last period start date

Average cycle length (days)

Typical period length (days)

Luteal phase (days, optional)

Next period—

Ovulation—

Fertile window—

Current cycle day—

Helps infer likely phase

No data

This is not medical advice. Calculations are estimates based on averages; cycles vary from person to person.

Menstruation Fertile window Ovulation