# How to Calculate Percent Error?

How do you calculate percentage error?

## Percentage Error Calculation

Percentage error** **is the ratio of the difference in original and observed value to the original value expressed in percentage. This simple step by step tutorial will help you to learn how to find the percentage error.

**Formula :**

**[(Original Value - Observed Value) / Original Value] x 100**

**Step 1:** Let us consider the original value as 30 and observed value as 32.

Original Value = 30

Observed Value = 32

**Step 2:** Applying the values in the formula,

= [(30-32) / 30 ] x 100

Ignore any minus sign that occurs in the ratio [(30-32) / 30 ].

Simplifying, we get

= (-2 / 30) x 100

= (2/3) x 10 [Ignoring minus sign]

= 6.66%

Hence, **6.66**% is the percentage error.

Find the error percentage ratio of the observed value and the original value using this simple percent calculator.

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