Knowing your ovulation date helps identify your most fertile window, which is useful whether you're trying to conceive or simply tracking your cycle.
This calculator estimates ovulation as 14 days before your next expected period, based on the start of your last period and your average cycle length.
Example: LMP on 1 January, 28-day cycle:
Ovulation = 1 January + (28-14) = 1 January + 14 = 15 January
The fertile window typically spans about 5 days before ovulation through the day of ovulation itself, since sperm can survive for several days.
Not necessarily - day 14 is typical for a 28-day cycle, but ovulation timing shifts with your actual cycle length.
Yes, stress, illness, and lifestyle changes can shift ovulation earlier or later than predicted.