Uncertainty measures the lack of certainty or sureness of an outcome.

Uncertainty of a measured value can also be presented as a percent or as a simple ratio.

**Formula to calculate percent uncertainty.**

When calculating percent uncertainty, absolute uncertainty is used.

**Example:**

Suppose you measured the quantity of a solution using a measuring cylinder and found it to be 25.2 cubic centimeters, if the uncertainty value is ± 0.05, calculate the percent uncertainty.

Therefore, the percent uncertainty is 0.2%.