# Percent Error Calculator

### Percentage (%) Error Calculator

Use this calculator when comparing a experimental value to a theoretical value. We think you reached us looking for answers to questions like:

1) What is the percent error supposing 99 as the measured value and 100 as the calculated value? 2) What is the absolute error between 100 and 99 supposing 100 as the theoretical value? Or may be: What is the percent error between 100 and 99

See the solutions to these problems below.

## How to calculate Percent Error - Step by Step Solution

The Percent Error Calculator uses this formula:

The terms "Experimental" and "Theoretical" used in the equation above are commonly replaced with similar terms. Some terms also used for experimental are "measured," "calculated," or "actual" and for theoretical the terms "accepted" and "calculated" are frequently used.

The Percent Error can be a positive or a negative number. If the experimental value is greater than the theoretical value, the result will be positive. On the other hand, if the experimental value is smaller than the theoretical value, the result will be negative. See more about percent error here.

## Here are the solutions to the questions stated above:

### 1) What is the percent error supposing 99 as the measured value and 100 as the calculated value?

Use the above formula to find the percent error. So, replacing the given values, we have

Percent error = [(99 - 100) / 100] x 100

= (-1 / 100) x 100

= -1 % (negative error)

In this case we have a % of negative error because the experimental is smaller than the theoretical.

### 2) What is the absolute error between 100 and 99 considering 100 as the theoretical value?

This problem is not about percent or relative error, but about absolute error. The solution is very simple:

= 99 - 100 = -1 (negative error)

### Percent Error Calculator

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## Sample percentage change calculations

### Disclaimer

While every effort is made to ensure the accuracy of the information provided on this website, neither this website nor its authors are responsible for any errors or omissions, or for the results obtained from the use of this information. All information in this site is provided “as is”, with no guarantee of completeness, accuracy, timeliness or of the results obtained from the use of this information.