Enter the first day of your last period. Adjust cycle length and luteal phase if you track them. We’ll predict ovulation, fertile days, next period, and key testing windows.
Inputs
If unsure, 14 is a common estimate
Summary
Predicted ovulation
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Fertile window
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Calendar
Optional ad slot
Notes
This is an estimate based on your inputs. Ovulation can vary cycle to cycle.
For the best accuracy, track ovulation signs (OPKs, BBT, cervical mucus) and talk to a clinician if you have concerns.
We assume the fertile window is ovulation −5 to +1 day.