Ovulation Calculator
Enter the first day of your last period and your usual cycle length to see your most fertile days and next period dates for the next three months.
Frequently asked questions
When am I most fertile?
In the five days before ovulation and on ovulation day itself. The two days before ovulation carry the highest chance of conception.
How is ovulation estimated?
Ovulation usually happens about 14 days before the next period starts. With a 28-day cycle that is day 14; with a 32-day cycle, day 18.
Can I use this to avoid pregnancy?
No. Cycles vary month to month and calendar methods alone are not reliable birth control.