Period Calculator - Dr. Ismail Healthcare Group

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Period Calculator

Menstrual calculator principles

In order for this period calculator to work correctly, you need to input basic information about your menstrual cycle. This includes:

  • Your cycle duration. The cycle typically lasts for about 28 days, so if you’re unsure about how long yours is, 28 days is a reasonable estimate. If, however, you have been using a period tracker for quite some time, you might now that your cycle is consistently longer or shorter – for example, 27 or 30 days.
  • Period duration. Some lucky women only experience bleeding for about three days, while others have periods lasting about six or seven days. Enter the average duration of your period in this field.
  • Last period started on… The last information our period predictor needs is the date when your previous period began. This day is customarily understood as the first day of your menstrual cycle.