Ovulation Calculator
Find your most fertile days and ovulation window.
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Ovulation Calculator
Find your most fertile days and the best time to conceive based on your cycle.
days
Usually 21 – 35 days
day of cycle
Optional — defaults to cycle end
Predicted ovulation day
Your most fertile window
Day
to
Day
· ovulation around Day
Next period
Cycle length
Enter your cycle length and press Calculate.
How ovulation is calculated
Ovulation typically happens 14 days before your next period starts, which is roughly the midpoint of a standard 28-day cycle.
Ovulation = cycle length − 14
Fertile window = Day (ovulation − 5) to (ovulation + 1)
Fertile window = Day (ovulation − 5) to (ovulation + 1)
Sperm can survive several days, so the best chance of conception is on the five days before ovulation plus the day of ovulation itself.