Ovulation & Fertile Window
Pinpoint your most fertile days of the month to maximize your chances of conception.
Next Ovulation Date
High chance of conception on this day.
Having intercourse during these 5 days provides the highest probability of pregnancy. Sperm can survive up to 5 days in the reproductive tract.
About this calculator
Ovulation usually occurs about 14 days before the next period. The fertile window spans roughly five days before ovulation to the day after.
Results are for information only and are not a diagnosis. Consult a doctor for medical advice.
Frequently asked questions
When am I most fertile?
In the days just before and on ovulation day.
Is this reliable as contraception?
No. Calendar estimates are not a safe contraceptive method.
Related reading
Early Pregnancy Symptoms: Signs, When to Test and What to Do Next
Common early signs of pregnancy, when to take a test, folic acid, foods and medicines to avoid, warning signs of ectopic pregnancy and miscarriage, and your first antenatal steps in Sri Lanka.