Medically Reviewed by the Prof. Dr. Nazli Hameed | Updated February 2026. Stay ahead of your cycle. Predict your next period, identify your fertile window, and track your reproductive health with clinical precision.
Next Period Date
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Enter your cycle details to see predictions
Women's Period & Cycle Tracker
Stay ahead of your cycle. Predict your next period, understand your fertile window, and track your reproductive health with precision.
How to Use This Tool?
Takes less than 30 seconds — no sign-up needed.
01. Log Your Last Period
Select the first day your most recent menstrual cycle starts. This is your anchor date — everything is calculated forward from here.
02. Enter Your Cycle Length
Input your average length in days. Not sure? The average menstrual cycle is 28 days — use that as your starting point and adjust as you track more cycles.
03. Read Your Results
You'll instantly see your future period dates, ovulation date, luteal phase window, and high-fertility days for the months ahead.
Why Your Cycle Dates Actually Matter
Knowing your future period dates isn't just about convenience — it's a window into your overall health. A regular menstrual cycle that stays consistently within the 21–35 day range is one of the clearest signs that your hormones are balanced. A sudden shift of 7 or more days from your usual average length, however, can be an early indicator of stress, thyroid changes, nutritional deficiency, or conditions like PCOS.
Your ovulation date is equally significant. Ovulation occurring consistently around the midpoint of your cycle suggests a healthy luteal phase — typically 12 to 16 days long. A luteal phase shorter than 10 days is considered clinically short and may affect fertility, making it worth discussing with a healthcare provider.
In short: when you track your cycle, you're not just predicting dates — you're building a personal health record that makes irregularities visible early, before they become larger concerns.
Understanding Your Menstrual Cycle
A regular menstrual cycle is measured from the first day of one period to the day before the next one begins. The widely cited 28 days is simply a statistical average — most women fall somewhere between 21 and 35 days, and that variation is completely healthy.
When you consistently track your cycle over several months, patterns unique to your body emerge — subtle shifts in energy, mood, or discharge that signal exactly where you are in your cycle on any given day.
Ovulation & the Fertile Window
Your ovulation date typically falls around 14 days before your next expected period. In an average menstrual cycle of 28 days, this is usually around day 14. The days immediately surrounding ovulation form your fertile window — the time when conception is most likely.
Sperm can survive inside the body for up to 5 days, so pregnancy is possible even if intercourse doesn't happen exactly on ovulation day. Knowing this window helps whether you're trying to conceive or simply planning ahead.
How This Tool Calculates Your Results
This cycle tracker uses the standard Naegele's Rule–based formula widely adopted in gynecological practice: your next period date is calculated by adding your average cycle length to the first day of your last period. Ovulation is estimated at cycle length minus 14 days — consistent with the luteal phase length established in peer-reviewed reproductive medicine research.
The fertile window is calculated using the 5-day sperm survival window recognized by the American College of Obstetricians and Gynecologists (ACOG). The luteal phase is estimated as the 12–16 day post-ovulation window, in line with standard clinical guidelines.
This tool was built and reviewed by our health content team with reference to ACOG guidelines and peer-reviewed obstetric literature. It is provided for information purposes only and is not a substitute for professional medical advice. Consult a qualified healthcare provider for any concerns about your reproductive health.
Frequently Asked Questions
How accurate are cycle predictions?
Predictions are highly reliable for women with a regular menstrual cycle. The more consistently you log your data, the more accurate your future period estimates become. Stress, illness, or significant lifestyle changes can shift actual dates.
What if my cycle isn't exactly 28 days?
That's completely normal. The 28-day figure is a population average. Enter your own average length — calculated from your last 3 to 6 cycles — for results that reflect your body, not a textbook.
When is the best time to take a pregnancy test?
Wait until at least one day after your missed period for the most accurate result. Testing too early can produce false negatives even when conception has occurred.
Can I use this if my periods are irregular?
Yes. Use the average of your last 3–6 cycles as your cycle length input for a more representative estimate. If your cycle varies by more than 7–9 days regularly, consult a healthcare provider for a full evaluation.