# Average Calculator

The average calculator will calculate the mean of up to thirty numbers. An interesting aspect of the calculator is you can see how the mean changes as more values are entered. Before you use the calculator, you should know how to calculate the average, just in case you are without internet and cannot access this calculator. Note that the mean is the same as average and these terms can be used interchangeably.

## How to Calculate Average

The average of a set of numbers is simply the sum of the numbers divided by the total number of values in the set. For example, suppose we want the average of `24`

,`55`

, `17`

, `87`

and `100`

. Simply find the sum of the numbers: `24 + 55 + 17 + 87 + 100 = 283`

and divide by `5`

to get `56.6`

. A simple problem such as this one can be done by hand without too much trouble, but, for more complex numbers involving many decimal places, it is more convenient to use this calculator. Note that the mean rating calculator does a similar math - it calculates an average rating given the number of votes with values from 1 to 5.

## Similar Concepts Involving Averages

The weighted average calculator lets you assign weights to each number. A number weighting is an indicator of it's importance. A common type of a weighted mean that is computed is the grade point average (GPA). To do this by hand, follow these steps:

- Multiply the value of the letter grade by the number of credits in the class.
- Do this for all the classes and take the sum.
- Divide the sum by the total number of credits.

Suppose the grades are an A for a `3`

credit class, two B's for the `4`

credit classes and a C for a `2`

credit class. Using the standard value of `4`

for an A, `3`

for a B and `2`

for a C, the grade point average is `GPA = [4(3) + 3(4) + 3(4) + 2(2)]/(3 + 4 + 4 + 2) = 40/13 = 3.08`

Note that the average calculator will compute the average for all values that are weighted equally. For a weighted average, such as GPA and other statistical applications, the weighted average calculator linked above is the tool you want to use. In statistics the mean is known as a measure of central tendency.