### How to Find Percent Error? Formula & Explanation

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How to find percent error? In mathematics and science, a percentage error is a measure of the difference between a measured value and the true value of the quantity being measured. The percentage error is computed as the absolute value of the difference divided by the true value and multiplied by 100.

Percentage errors are often reported in scientific papers, where they are used to compare the results of different experiments or to track the progress of a research project. However, they can also be used in everyday life to check whether a number that someone quotes are accurate. For example, if you hear that your favorite band is playing at a venue that holds 1000 people, you can check to see if that number is close to the expected attendance by doing some simple math.

Percentage errors can be both positive and negative.

**How to Calculate Percent?**

In order to calculate a percentage, divide the number of items that match the criteria by the total number of items and multiply by 100. This will give you the percentage that matches the criteria.

**How to Calculate Percent Error?**

In order to find the percent error, you will need to divide the difference between the two numbers by the average of the two numbers. Once you have that number, you will need to move the decimal point two places to the right. This is your percent error.

**Percentage Error Formula**

In mathematics and statistics, the percentage error (PE) is a measure of how close a measured value is to the true value. The PE is computed as the absolute value of the difference between the measured and true values, divided by the true value: The percentage error is also called the relative error.

Percent error = (Approximate or experimental Value – Exact or known Value/Exact or known Value)∗100

**Example 1**

For example, if you are working with a set of data that has a difference of 5 and an average of 8, your percent error would be 25%.

**Example 2**

In order to calculate percent error, you need to take the absolute value of the difference between the experimental value and the theoretical value, divide it by the theoretical value, and multiply it by 100%.

So, if an experiment yielded a result of 9.7 grams and the theoretical value was supposed to be 10 grams, then the percent error would be (9.7-10)/10*100%= -3%. If an experiment yielded a result of 9.7 grams and the theoretical value was supposed to be 9 grams, then the percent error would be (9.7-9)/9*100%= 8%.

**Percent Error Versus Absolute and Relative Error**

The purpose of this paper is to discuss percent error versus absolute and relative error. In scientific and mathematical circles, percent error has long been the standard way to express accuracy. This is partly because it can be easily calculated from the difference between the measured and actual values.

As a measure of accuracy, however, percent error is not without its flaws. One major problem with the percent error is that it is always relative to the size of the measurement unit. For example, if you measure the length of a room in feet and calculate a percent error of 2%, your result means very little unless you also know what the original measurement was in feet.

In other words, percent error tells you how far off your measurement was from the true value but says nothing about how close it was to the true value. A related issue is that percent error can be misleading when there are large measurements involved.

**FAQs**

**Q: Can you have a Negative Percent Error?**

A: A percent error is a measure of how far off a measured value is from the true value. Percent error can be positive or negative, but it cannot be a negative percent error.

This is because percent error is defined as the absolute value of the difference between the measured and true values, and a negative number cannot be an absolute value.

**Q: What does a Percent Error tell us?**

We can use a tool called a caliper to measure the width of a piece of metal with great accuracy. However, when we do this experiment, we may not get the same result every time. This variation is due to random errors in our measurement. A percent error tells us how much our measurement deviates from the actual value.

It is important to note that percent error does not tell us the absolute value of the deviation; it only tells us how large the deviation is relative to the size of the measured value. For example, if I measure the width of a metal piece to be 10 cm and my actual width is 9 cm, my percent error would be 10%. This means that my measurement was off by 1 cm (or 10%), relative to the actual width.