Estimates a range of days during which a woman is most likely to conceive, as well as a corresponding due date based on a woman's average menstrual cycle.
This ovulation calculator is your go to tool for figuring out the days when you are most likely to conceive. Just enter the start date of your last period along with your average cycle length, and it will quickly show you your expected ovulation day, your fertile window, and even a potential due date if you do get pregnant. It also predicts this for the next three cycles, helping you plan ahead and stay in tune with your body.
Ovulation is the process where your body releases a mature egg from your ovary. It usually happens once during each menstrual cycle, typically around the middle of the cycle. The egg then makes its way down the fallopian tube, waiting for fertilization. If sperm is present, fertilization can happen, leading to pregnancy. If not, the egg breaks down and your period usually starts about two weeks later.
Timing matters because the egg only survives for about 12 to 24 hours after it is released. Meanwhile, sperm can stay active in your body for up to five days. This means your most fertile days are not just the day you ovulate, but also the days leading up to it. That fertile window is your best chance of getting pregnant.
For most people, the second half of the cycle stays fairly steady. This phase is called the luteal phase and usually lasts about 14 days. What changes from person to person is the length of the first half of the cycle, before ovulation. That is why the calculator asks for your full cycle length. It uses that to estimate your next period and works backward to predict when ovulation will happen.
This tool is useful whether you are trying to get pregnant, avoiding pregnancy naturally, or just learning about your body. It turns something that can feel overwhelming into a simple and helpful experience. You get accurate, science based predictions without needing to track everything manually.
Understanding ovulation helps you take charge of your health and make informed choices. With this calculator, you get a clear look at your fertile days, possible due dates, and how your cycle works.