Free calculator
Ovulation calculator
Pick the first day of your last period on the calendar and we’ll show your ovulation day, fertile days and next period instantly.
1
First day of your last periodPick a day on the calendar
PeriodExpected periodFertileOvulationToday
Cycle lengthFrom the start of one period to the next. Usually 21-35 days
28 days
How long your period lastsUsually 3-7 days
5 days
Pick a day on the calendar
Your results appear here instantly: ovulation day, fertile days and next period.
This estimate is based on averages and is not a form of birth control. If your cycles are irregular or you’ve been trying for more than a year, talk to a doctor.
Let the dates fit your own cycle
LunaList makes its estimates more precise with every new cycle, based on your logs, not a 28-day average.