Percentage error is the difference between absolute estimated value and the absolute actual value in comparison to the actual value and is expressed as a percentage.

Percentage errors tells you how big your errors are when you measure something in an experiment.

The purpose of a percentage error calculation is to gauge how close a measured value is to a true value.

**Formula to calculate percentage error.**

**Example:**

The exact length of a string is 2.25 cm. When using a ruler, a student got the length of the same ruler to be 2cm. Determine the percentage error in the measuring of the string.

Therefore, the percentage error in the measuring of the string is 11.11%.