Probability Calculator

You may have come across various potential outcomes of an event that could happen and seriously impact you. Do you want to increase your chances of a successful outcome by learning the likelihood that a specific event will occur? Our Probability Calculator can make your life easier by figuring out complex probabilities.

All you need to know about this tool:

The probability of an event means how much chance is there that the event may occur. In our daily lives, we find ourselves in many such circumstances where there are multiple possible outcomes of the situations. Our tool helps in figuring out how much is the chance of occurrence of a certain event. It not only helps in avoiding cumbersome mathematical calculations but also saves time and gives instant results.

We aim to make our user's experience as convenient as we can. If you find any difficulty in using the tool initially, you can also use the sample values available in the tool. The tool is really simple to use as it requires input values for the Number of possible outcomes that an event may result in, and the Number of events occurred. Upon providing these, the tool calculates the exact Probability of an event that occurs and the Probability of an event that does not occur.

How to use our Probability Calculator?

You can easily launch our 'Probability Calculator' directly from our home page under the Calculator section. You no longer need to perform any complex calculations manually to determine the probability of an event, because our tool will give you precise results instantly. We aim to make our user's experience as convenient as we can. Probability Calculator, like the rest of our tools, is incredibly simple to use. You will be able to use our tool without much help even if you don't have a lot of technical experience. We don't want you to spend any time understanding the tool and that's how we designed our interface.

Initially, you can get to know the tool by using the sample values for calculations. It can be done as:

Using the Sample Values:

Before getting into the step-by-step guide, let us make it easy by filling in the sample values.

1. Open our Probability Calculator's webpage. You'll see two boxes with labels 'Number of possible outcomes' and 'Number of events occurred'. Beneath the boxes, there are three buttons with blue, green, and orange colors, titled 'Calculate', 'Sample', and 'Reset' respectively.
2. Click on the Sample button. It will fill the two fields with sample values of 9 possible outcomes, and 3 events occurred.
3. Then click on the Calculate button to find out the probability values for these sample inputs.

Using your Actual values:

Follow up with the instructions provided to figure out the probability that an event may occur:

1. Enter the Number of Possible outcomes:

1. When you open our Probability Calculator's webpage, you'll see the top box with the label 'Number of possible outcomes'. In that field, enter the number of possible outcomes that an event can have. It can sometimes be called sample space.
2. If you want to change the entered value, you can use the up and down arrows at the right side of this box. The up arrow will increase the value by unity, and the down arrow will decrease it by unity. You can also change the value by deleting the previously written value and then re-entering the new value.

1. Enter the Number of Events occurred:
1. Among the two boxes, you'll see the bottom box with the label 'Number of events occurred'. In that field, enter the number of events occurred, for which you want to figure out the probability. In other words, this means that you have to enter the number of outcomes that will allow a particular event to happen.
2. If you want to change the entered value, you can use the up and down arrows at the right side of this box. The up arrow will increase the value by unity, and the down arrow will decrease it by unity. You can also change the value by deleting the previously written value and then re-entering the new value.
2. Calculate:
1. Once you have entered the values for both fields, next you have to click on the Calculate button. You'll get the resulting probabilities.
2. If you wish to change the values and want to do calculations for some other scenario, you can do so by clicking firstly on the Reset button, it will clear all the fields. Then you can repeat the same procedure to figure out the probabilities.

What do the resulting probabilities mean?

Upon clicking the Calculate button after entering the number of possible outcomes, and the number of events that occurred, a new table will appear with the calculated probability values for entered inputs. It includes the Probability of the event that occurs and the Probability of the event that does not occur.

Sometimes, the interpretation of results can be confusing. Let us demonstrate with the help of an example for your better understanding. Let's suppose that you have 5 balls in a bag. There are 2 red balls and 3 blue balls. If you want to find the probability of a red ball being drawn from the bag then you have to input 5 as the Number of possible outcomes, since there are a total of five balls. And, you have to enter 2 in the Number of events occurred, which is the number of red balls that would allow this event to happen. The answers given by the tool are:

• The probability that the event occurs: 0.4
• The probability that the event does not occur: 0.6

Hence, there is a 0.4 probability that the drawn ball will be red and a 0.6 probability that the drawn ball will not be red i.e. it will be blue.

FAQ's:

Following are some of the questions that you may have regarding the Probability Calculator:

Q: How do you calculate probability?

A: By simply dividing the favorable number of possibilities by the entire number of possible outcomes, the probability of an occurrence can be determined.

Q: How can I convert a probability to a percentage?

A: To convert a probability to a percentage, you simply have to multiply it by 100. The higher the percentage, the higher the likelihood of an event to occur.

Q: What is the probability that I will draw an ace from a card deck?

A: There are a total of 52 cards in a deck. Out of these 52, the number of aces is 4. To calculate probability, by using the probability formula, we simply have to divide 4 by 52 and the answer is 0.077.

Q: Can the probability be negative?

A: No, probability cannot be negative. It doesn't make any sense that probability is negative. A probability is always greater than or equal to zero and always less than or equal to one.

Q: Why do we use probability?

A: Information about the possibility that something will happen is provided by probability. For instance, meteorologists use weather patterns to forecast the likelihood of rain.

Why should you use our tool?

Our probability calculator has been made to make your life easy. With a very user-friendly interface, it can solve your confusing and difficult probability problems in a matter of milliseconds. The tool is completely free and does not even require you to register to use it. You can also use the sample values if you are not sure about how the tool would work in the beginning. Moreover, we have also covered all the important questions that can bug your mind. Hence, all the necessary guidance regarding the tool has been provided.

Amir Iqbal

CEO / Co-Founder

An entrepreneur working in various sectors, mainly the web technology niche, enjoys the little things in life. When people give up, they often don't realize how close they were to success.