
Period Calculator
Sync in with your periods! Tracking periods gives you a better idea and familiarity with your body, it also indicates if you are late or skipping your menstrual cycle. This period calculator helps you plan your month in advance by providing personalized results based on your inputs.

How To Use
Period Calculator?
Period Calculator?
This period calculator is easy to use and does not require any complex guidelines. Follow these simple steps to get the best-estimated results:
- Mark the start date of your last menstrual period (LMP)
- Enter the duration of the period
- And lastly, enter the average length of your menstrual cycle
Once you enter all the necessary information, the calculator estimates the results including the fertile period, ovulation date and the timelines for the next period.
Different Stages of the Menstrual Cycle
Typically, The menstrual cycle is categorised into four phases based on their characteristics:
Menstrual Phase (Days 1-5):
This phase is defined by menstruation or the shedding of the uterine lining, and initiates the monthly cycle. Hormone levels fall during this phase, which causes the endometrium—the lining of the uterus—to shed and leave the body as menstrual blood through the vagina. The common symptoms of this phase are:
- Abdominal Cramps
- Bloating
- Headaches
- Mood swings
- Tender breasts
- Fatigue/tiredness
Follicular Phase (Days 1-13):
The follicular phase starts after menstruation. Follicle-stimulating hormone (FSH), produced by the pituitary gland, promotes the development of ovarian follicles during this period. Each ovarian follicle contains an immature egg. The endometrium thickens in anticipation of the possible implantation of a fertilized egg as estrogen levels rise. Here are some signs that can help you determine the second phase of your menstrual cycle:
- Higher energy levels
- Fresh and glowing skin
- Increase in sex drive
Ovulation (Day 14):
Although it varies from woman to woman, ovulation usually happens around day 14 of the menstrual cycle. A spike in luteinizing hormone (LH) causes one of the ovarian follicles to release a mature egg during ovulation. During this stage, the egg is most fertile, with a window of around 12 to 24 hours following release for fertilization. In this phase, you can expect your peak fertility days and the following signs can indicate and help you determine when you can plan your pregnancy:
- Cervical mucus changes
- Heightened senses
- Breast soreness or tenderness
- Mild pelvic or lower abdominal pain
- Vaginal bleeding
- Sharp or dull cramp
- Vaginal Discharge
- Nausea
- Light spotting
Luteal Phase (Days 15-28):
The luteal phase occurs after ovulation. The ovarian follicle that bursts becomes the corpus luteum, a tissue that secretes progesterone and a small amount of estrogen. These hormones help the uterus get ready for possible embryo implantation by supporting the thicker endometrium. The uterine lining sheds and a new menstrual cycle begins if conception is unsuccessful due to a drop in hormone levels. After the ovulation phase, if you don’t conceive, then you can experience the mentioned signs and symptoms:
- Bloating
- Breast swelling, pain, or tenderness
- Headaches
- Mood swings
- Weight gain
- Changes in sexual desire
- Food cravings
- Trouble sleeping
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Signs of
Delayed Periods
If your period is late or delayed beyond its expected arrival date, several signs and symptoms may indicate this delay. These signs can vary from person to person, but common indicators of a late period include:

Prolonged stress can alter the synthesis and regulation of hormones, which may result in irregular or delayed menstruation.
Irregular menstrual cycles and delayed periods can be caused by several medical conditions, including polycystic ovarian syndrome (PCOS), thyroid problems, hormone imbalances, and problems with the reproductive system.
A most obvious sign of a late period is the absence of menstrual bleeding beyond the expected date. Also, pregnancy can cause missed and delayed periods.
Substantial weight fluctuations, whether due to weight gain or loss, can impact menstrual cycles and hormonal balance, sometimes resulting in delayed periods.
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Myths & Facts
Fact:
Premenstrual symptoms (PMS) are real and usually happen a week or two before the menstrual cycle. These symptoms typically occur because of hormonal changes. According to NCBI, over 20-40% of women experience premenstrual syndrome during their reproductive age.
Fact:
There is no such evidence or study that says the statement is true. In fact, personal hygiene is important and a warm shower can ease your menstrual cramps.