# What is the percent difference between 36 and 81?

## Percentage Difference Calculator

## How to work out percentage differences - Step by Step

To find the percent difference between two values x and y, use this formula:

Note: the "|" marks either side (called "bars"), represents the absolute value of the expression inside them. This operation always returns a positive value or zero (in the set of real numbers - ℝ).

### Examples of absolute values:

- |81| = 81
- |-81| = 81
- |45| = 45
- |-3| = 3
- |0| = 0

Using this tool you can find the percent difference between any two values. So, we think you reached us looking for answers to questions like:

1) What is the percentage difference between 36 and 81?

2) What is the percentage difference between 81 and 36?

3) What is the absolute difference between 36 and 81?

Or may be:

What is the percent difference between 36 and 81?. See below the solution to these problems.

Where: x and y are two values of a give variable. Note that percent difference is not equivalent or equal to percent change. Percent change is used when comparing a new value to an old value where the old value is used as a reference. Percent difference is used just to compare two values without considering any order. It doesn't matter which of the two values is written first. That is why the absolute value^{(*)} is often used. Percent difference is also called relative percent difference.

(*) Note: absolute value means that we must consider always a positive value as for example: |1|=1 (absolute value of 1 is 1) and |-1|= 1 (absolute value of minus 1 is also 1). See more about percent difference here.

Here are the solutions to the questions stated above:

### 1) What is the percentage difference between 36 and 81?

Use the above formula to find the percent difference between two numbers. So, replacing the given values, we have the percent difference equation

Where: y = 36 and x = 81, so |y| = 36 and |x| = 81

### 2) What is the percentage difference between 81 and 36?

As we can see, the answers to questions 1) and 2) are the same. That is because when we talk about difference in percentage, the order of the two values does not matter because the formula takes the absolute value of the difference divided by the mean value of each value.

### 3) What is the absolute difference between 36 and 81?

This problem is not about percent difference, but about absolute difference:

The absolute difference of two real numbers x, y is given by |x − y|, the absolute value of their difference. The minus sign denotes subtraction, and |z| means absolute value. Absolute difference describes the distance between the points corresponding to x and y on the real line.

Now that you know what is an absolute difference, The solution is very simple:

## What is the difference between "percentage change" and "percentage difference"?

It is important to note that the terms "percentage change" and "percentage difference" are related with each other. However, they have different meanings in different circumstances, and they are calculated differently.

### Percentage Difference

On the other hand, this measures the relative difference between two values or how much one value differs from another. It is usually used to compare two quantities without taking into account time variation. The formula for the percentage difference is:

% difference = |x - y(x + y)/2| × 100%

### Example:

If you are comparing the heights of two people, one 160 cm tall and the other 180 cm tall:

% difference = |160 - 180(160 + 180)/2| × 100%

Thus, the "Percentage Difference" is: 11.76%

### Percentage Change

This term refers to a value where one can calculate how much something has changed over time. It is often used when describing financial metrics such as prices, revenues, or profits for a given period of time. The formula for percentage change is:

#### Example:

If you are comparing the heights of one person over the years from 160 cm tall to 180 cm tall:

Percent change = 180 - 160 |160| × 100%

So, the "Percentage Change" is: 12.5% (increase)