Enter the date your last period started and your usual cycle length — we'll tell you when to expect your next one, where you are in your cycle right now, and when your fertile window falls.
The average cycle is 28 days, but anything from 21–35 days is considered normal. Even within that range, your cycle can shift by a few days each month — that's completely normal.
About cycle phases
Your cycle has four phases: menstrual, follicular, ovulation, and luteal. Each brings different energy levels, moods, and physical changes — getting to know your pattern can be really empowering.