Conception · Ovulation
When are you most likely to conceive?
Based on your cycle, here's the six-day fertile window — the only days in any cycle when conception is possible.
First day of last period
Average cycle length · days
28
21–35 days is typical · 28 is the average
Most likely ovulation day
May 12in 9 days
Fertile window: May 7 – May 13
Your cycle, visualized
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PeriodFertile windowOvulation
If you conceive this cycle
Estimated due date:
February 2, 2027
That's roughly 9 months from today.
How accurate is this, honestly?about±2 days
Accuracy±2 days
Ovulation prediction from cycle math alone is right within ±2 days about 60% of the time. Real bodies don't run on calendars. For higher accuracy, pair this with basal body temperature tracking, ovulation test strips, or cervical mucus changes — or all three. If you've been trying for 6+ months without success (or 12+ if under 35), that's the signal to talk to a doctor.