| Cycle | Period Start | Period End | Ovulation (est.) |
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Predict your future periods' estimated due dates and fertile window. Enter the first day of your last period, your cycle length, and period duration, and our period tracker instantly predicts your upcoming period cycles and estimated ovulation day. Free, private, no sign-up needed.
Our calculator is a free online tool that predicts your upcoming period dates based on your personal cycle information. If you are not sure about this span, then count back your last two or three cycles to find out the days between your two periods then use the average.
If you know your last month's period start date, your average cycle days, and the number of days your periods last, then you can easily calculate the expected date of your next period using our online free calculator. Our free tools will instantly show you when your periods are expected to start and end, along with your estimated ovulation date.
No sign-up needed, no account making required, and no personal data is stored. Everything runs directly in your browser. It is completely safe for use and does not require your personal information. It is accessible easily so you can track your periods with ease.
You can use this tool easily by just entering a few details to predict when your next period will happen. You must know the following details and should enter them in the calculator for the calculator process:
Enter the date your most recent period began. Use the first day of actual bleeding, not spotting.
This is the number of days in your menstrual cycle. It starts from the first day of one period to the first day of the next. Every woman has a different cycle, and it can be between 20 to 35 days or above too. Sometimes, 40 days is also taken as normal.
This is the number of days your period stays. How many days does your period typically last? Enter this thing here. Most periods last between 3 and 7 days, and this is different for everyone. Once you fill in all three fields, click on “Predict Cycles” to see your results.
The results table shows:
Our calculator predicts multiple cycles ahead for you. You can see the estimated answer or prediction of your next six-month cycles. This can help you plan your next month's cycles in advance or know about the fertile period.
The formula to calculate the next month period is very simple:
Next Period Date = First Day of Last Period + Cycle Length
Example: If your last period began on April 1st and your cycle is 28 days, your next cycle is expected around April 29th.
For ovulation, subtract 14 days from your next menstrual date. In the example above, the estimated date for that falls around April 15th.
This global period tracker is suitable for any regular menstrual cycle between 21 and 35 days. It is free to use from anywhere in the world. All calculations happen instantly as you enter your details, and no personal data is stored inside it. It is safe from all sides.
The results you get from this calculator are estimated and can be used for planning purposes only. Menstrual cycle dates do not happen on the predicted dates. These expected and calculated dates can vary due to several internal body issues like stress, illness, environmental changes, and hormonal shifts.
This tool is just a calculator that gives you the answer based on your numbers and not a medical device. So do not use any medication accordingly. Consult a healthcare professional for medical concerns about your cycle.