Ovulation Calculator
The Ovulation Calculator estimates the most probable ovulation/fertile window as well as other related dates. The estimations are based on a woman's last period date. This calculator should not be used as a form of birth control.
About Ovulation and Fertility
Ovulation Window
The ovulation window is typically 5 days long, centered around the most probable ovulation date. This is when you are most fertile and have the highest chance of conception.
Intercourse Window
The intercourse window for pregnancy includes the 5 days before ovulation and the day of ovulation. Sperm can survive in the female reproductive tract for up to 5 days.
Important Notes
• This calculator is for educational purposes only
• Do not use as a form of birth control
• Cycle lengths can vary from month to month
• Consult with a healthcare provider for family planning
• Pregnancy tests are most accurate 14 days after ovulation