A percentage very close to zero means you are very close to your targeted value, which is good. It is always necessary to understand the cause of the error, such as whether it is due to the imprecision of your equipment, your own estimations, or a mistake

This free percent error calculator computes the percentage error between an observed value and the true value of a measurement. Explore various other math calculators ...

Percent error is the difference between an approximate or measured value and an exact or known value. Here is how to calculate percent error.