Ovulation Calculator
Healthy sperm still need the right timing. Conception is only possible during a short fertile window each cycle. Enter the first day of your partner's last period and her cycle length to see the days when trying is most likely to succeed.
Enter cycle details
Based on her last periodThe six days that matter
The fertile window is roughly the five days before ovulation plus ovulation day itself. Sperm can survive in the reproductive tract for up to five days, while an egg lives for about 24 hours, so the days leading up to ovulation are actually the most important.
Sperm lifespan, up to 5 days, so intercourse before ovulation still counts.
Egg lifespan, about 24 hours after ovulation, marking the end of the window.
Best approach, regular intercourse every 1–2 days through the highlighted window maximises the chance.
An estimate, not a guarantee. Cycle length varies month to month, and ovulation can shift. For irregular cycles or if you've been trying for over a year (or six months if your partner is over 35), speak with a fertility specialist.