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1. Mark the start of the previous period. Choose the day when the most recent bleeding started.
2. Set the cycle length. On average 28 days, but 21–35 is normal variation.
3. Enter the bleeding length. Typically 3–7 days.
4. Calculate the estimate. You get the start of the next cycle, ovulation and the fertile window. You can save them to a calendar.

The phases of the cycle in brief

The menstrual cycle is counted from the first day of bleeding to the first day of the next bleeding. Ovulation, i.e. the release of the egg cell, usually happens about 14 days before the start of the next period. The most fertile window is a few days before ovulation and the ovulation day itself, because sperm can remain viable for several days. The calculator estimates these days based on the information you provide.

When should you contact a professional?

A regular cycle is individual. If the cycle is very irregular, the bleeding exceptionally heavy or painful, or if periods are missed, it is worth discussing the matter with a doctor or nurse. This calculator is intended for tracking and understanding your own cycle, not for making diagnoses.

Example: a 28-day cycle

Suppose the most recent period started on day 1 and the cycle length is 28 days. Then the estimated start of the next period is about day 29. Ovulation is typically about 14 days before the next bleeding, i.e. in this example around day 15 of the cycle. The most fertile window is a few days before ovulation and on the ovulation day. These are statistical estimates, and the actual timing can vary from month to month.

Tracking and variation of the cycle

The cycle length varies naturally, and cycles of 21–35 days are normal. Stress, lack of sleep, illness, travel and lifestyle changes can shift ovulation and thus the timing of the whole cycle. Tracking over a few months gives a more personal picture than a single calculation. If the cycle is very irregular or clearly differs from the usual, it is worth discussing the matter with a healthcare professional — this calculator is intended only to support understanding.

Background and limitations of the calendar method

The menstrual cycle calculator is based on the so-called calendar method, in which the upcoming days are estimated based on the length of the previous cycle. The method assumes a reasonably regular cycle in which ovulation falls at roughly the same point before the next bleeding. The steadier the cycle, the more accurate the estimate.

It is important to know the limits of the method. The cycle length varies naturally, and the timing of ovulation can shift for many reasons, so the calendar alone cannot be relied on for contraception, for example. The calculator gives a statistical estimate for understanding your own cycle, not medical certainty. If you need reliable information about fertility or contraception, discuss it with a healthcare professional — they can combine the calendar information with other, more precise methods.

Good to know about the cycle

• The cycle is counted from the first day of bleeding to the first day of the next bleeding.
• A normal cycle length ranges between 21 and 35 days.
• Ovulation typically falls about 14 days before the next bleeding.
• The estimate is statistical and is not suitable as the sole method of contraception.

خلاصة

The menstrual cycle calculator estimates the next period, ovulation and the fertile window based on the cycle length. Enter the start of the previous bleeding and the cycle length, and you get an indicative estimate of the upcoming days. The result is statistical and does not replace a healthcare assessment, but it helps you understand the rhythm of your own cycle. The days you enter are processed in the browser and are not sent to a server, and the estimate can be saved to a calendar on your own device.

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