Accuracy refers to the closeness of a measured value to a standard or known value.

This concept is important as bad equipment, poor data processing or human error can lead to inaccurate results that are not very close to the truth.

**Formula to calculate accuracy.**

So as to know how accurate a value is, we find the percentage error.

**Example:**

Suppose the known length of a string is 6cm, when the same length was measured using a ruler it was found to be 5.8cm. Calculate the accuracy of the ruler.

100% – 3% = 97%

Therefore, the results are 97% accurate.