# Probability Calculator

A free online Calculator that can be helpful for you to Calculate Probability within a second. With MTool Online tool, you can use various free calculators, software, and converter that can help you to use online.

## How to use a probability calculator?

To use a probability calculator, you will need to provide certain inputs that are relevant to the specific probability problem that you are trying to solve. The exact inputs required will depend on the problem, but here are some general steps that you can follow:

1. Determine the probability problem you want to solve. For example, you may want to know the probability of flipping heads on a coin, rolling a certain number on a die, or drawing a certain card from a deck.

2. Identify the events and outcomes that are relevant to the problem. For example, if you are flipping a coin, the events are heads and tails, and the outcomes are the possible results of the coin flip.

3. Determine the probability distribution. This means identifying the likelihood of each possible outcome occurring. For example, the probability of flipping heads on a fair coin is 0.5, and the probability of rolling a 6 on a fair die is 1/6.

4. Input the relevant information into the probability calculator. This may include the number of outcomes, the number of events, and the probability distribution.

5. Calculate the probability using the calculator. The calculator will use the input information to determine the likelihood of the event(s) occurring.

6. Interpret the results. The probability result will be a number between 0 and 1, or a percentage. This represents the likelihood of the event(s) occurring. For example, if the probability is 0.5, this means there is a 50% chance of the event(s) occurring.

Keep in mind that different probability calculators may have different inputs and methods of calculation, so be sure to check the specific instructions for the calculator you are using.

### Probability of an event that occurs

The probability of an event that occurs can be calculated using the formula:

Probability = Number of favorable outcomes / Total number of possible outcomes

In other words, to calculate the probability of an event that occurs, you need to divide the number of favorable outcomes by the total number of possible outcomes.

For example, let's say you are flipping a fair coin and you want to know the probability of getting heads. The favorable outcome is getting heads, and there are two possible outcomes (heads or tails). Therefore, the probability of getting heads is:

Probability of heads = Number of favorable outcomes / Total number of possible outcomes = 1 / 2 = 0.5

So the probability of getting heads is 0.5 or 50%.

Another example is rolling a fair six-sided die and getting a 3. The favorable outcome is getting a 3, and there are six possible outcomes (rolling a 1, 2, 3, 4, 5, or 6). Therefore, the probability of rolling a 3 is:

Probability of rolling a 3 = Number of favorable outcomes / Total number of possible outcomes = 1 / 6 = 0.1667

So the probability of rolling a 3 is approximately 0.1667 or 16.67%.

### Probability of an event that does not occur

The probability of an event that does not occur can be calculated using the complement rule. The complement rule states that the probability of an event not occurring is equal to 1 minus the probability of the event occurring.

In other words, to calculate the probability of an event that does not occur, you need to subtract the probability of the event occurring from 1.

For example, if the probability of getting heads on a coin flip is 0.5, then the probability of not getting heads (i.e., getting tails) is:

Probability of not getting heads = 1 - Probability of getting heads = 1 - 0.5 = 0.5

So the probability of not getting heads is 0.5 or 50%.

Another example is rolling a six-sided die and not getting a 3. The probability of rolling a 3 is 1/6 or approximately 0.1667. Therefore, the probability of not rolling a 3 is:

Probability of not rolling a 3 = 1 - Probability of rolling a 3 = 1 - 0.1667 = 0.8333

So the probability of not rolling a 3 is approximately 0.8333 or 83.33%.

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