Calculate the error subtract one value from the other ignore any minus sign. Next find out. Convert that to a percentage by multiplying by 100 and adding a sign.
First measure the actual value.
Measure the value that your experiment yielded. Why percent error is required. To calculate percent difference or percentage error you need to follow these steps First of calculating the error by subtracting one value from others and ignore any minus sign We get decimal number by dividing the error by the exact value Convert the results into a percentage by multiplying by 100 and adding a 100 sign. As we have already mentioned to calculate the percent error we need to know two other values.