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Period Calculator & Calendar

  • When Did Your Last Period Start
    (LMP Date):
  • How Long is Your Cycle:
  • How Many Days Did It Last:
Period Calculator

Getting period is always unpredictable. You do not know when it would come calling, and under what circumstances. Women with a regular menstrual cycle can expect it to come around certain dates, but for those who have irregular dates, prediction would become difficult. How about a tool that can tell you when you can have your next period? With a period calculator, you can map out your period cycle for months.Want to know more about it? Then keep reading!

What Is Period Calculator?
A period calculator can provide you a rough estimate about the starting dates for the next 12 periods. All you need to do is enter the starting date of your last period, days between the first day of your last period and the first day of your next period, and the standard length of your period cycle. Most of these calculators vary in complexity. Some ask for the average body temperature, while others take information on what the body is going through.

Importance of Period Calculator For Wannabe Moms:
When you wish to know your best chance of conceiving, you must find out when you are ovulating. It’s at this time of the month you are most fertile, giving the sperm the best chance of reaching the egg and fertilizing it. But the biggest problem is how to calculate the menstrual period. This is handled with the period calculator. The period calculator can help you predict the most fertile days of the month.

Most Frequently Asked Questions Around Menstrual Cycle

Q. How to track your period manually?

Here are some ways to track your period manually.
  • Keep a note on the first day of your period. Count the number of days between your menstruation and the number of days you bleed.
  • Keep a track of the physical symptoms. You need to keep a record of any cramp or pain you experience. Breast tenderness and vaginal discharge should also be considered.
  • You also need to pay attention to your emotions. Some women experience emotional changes with their hormone fluctuation. You may feel depressed, irritable and anxious for no reason.

Q. What is a Menstrual Cycle?

A menstrual or period cycle is the length of time from the start of one period to the start of the next one. A normal menstruation lasts somewhere between two to seven days, three to five being most common. The range of blood loss is 10 to 80 milliliters (ml), with 35ml being the average.

Q. Difference between Menstruation and Menstruation Cycle?

When a woman menstruates, her body discards the lining of the uterus. The blood flows from the uterus through a tiny opening, passing out the blood through the vagina. This is called menstruation.

A menstrual or period cycle is calculated from the first day of the period to the first day of the next period. An average menstrual cycle is 28 days long, but some women may have longer or shorter cycles. It can range from 21 to 35 days in adults and 21 to 45 days in teens.

Q. What factors may affect a woman’s menstrual cycle?

Several factors influence the date and flow of period. They include:

1. Diet And Exercise:
Exercise and diet can affect your period and your chances of pregnancy. If you are training for an athletic event and are not eating properly, your estrogen levels can drop, halting your period.

2. Weight:
Being too thin can also delay your periods, making your body think that you are not healthy enough for bearing a child. If you are overweight, excessive estrogen could build in your body, causing heavy or irregular periods.

3. Stress And Lifestyle:
Stress can mess badly with your cycle. Lifestyle habits like drinking and smoking can cause irregular periods.

Q. Can you speed up your menstrual cycle?

Here are a few ways to accelerate your menstrual cycle:
  • Take contraceptives on a regular basis. It can effectively regulate your menstrual cycle.
  • Some doctors recommend hormone injection to stimulate your menstrual cycle.
  • Sexual activity increases the blood flow to the genitals, stimulating the uterus to contract.
  • Eat high levels of vitamin C rich food. Vitamin C rich foods produce estrogen in the body and build the uterine lining, contracting the uterus and causing menstruation.

Q. How to find the safest days to have sex based on the period calculator to avoid pregnancy?

Calculating the safe period days is very simple. You have to know the last period date and determine the longest and shortest menstrual cycles by observing your menstrual cycle for the last six months. You can find it in the history section of your period calculator. Usually, days one to seven of the menstrual period are considered safe or infertile.

But if your menstrual period cycle does not fall between the 26th and 32nd day, then we’d suggest you try some other method.

Q. What to expect from MomJunction’s Period Calendar?

MonJunction’s period calendar requires you to input the date of your last menstrual period date to calculate your monthly period. The date here refers to the starting date of the last period cycle, not the ending one.

The second input requires you to give the average length of time between your periods. Since the term varies from person to person, it’s not wise to assume the figure. You must be as accurate as possible to determine your most fertile days if you are planning to conceive.

Once you’ve shared the inputs, the period calculator will show you the result. It won’t just give you a heads up on your next period start date for the next 12 cycles, but will tell you about your most fertile days and if you are late for your period cycle. Even if your period is delayed, you will know the next expected date of your period. This way, you can keep a track of the length of your menstrual cycle and the number of days it lasted.


The period calculator provides the approximate dates by considering your regular menstrual cycle. If your menstrual cycles are irregular, the tool may have trouble pinpointing your day of ovulation or period. While period calculators are not 100% accurate, the menstrual cycle is still a very useful tool. MomJunction is not responsible for any associated deviations, failures or liabilities.

Do you have any question about the period calculator, menstrual cycle or any other related topic? Ask us in the comment section below!