Enter the relative uncertainty and the measured value of a data point into the calculator to determine the absolute uncertainty.

## Absolute Uncertainty Formula

The following formula is used to calculate an absolute uncertainty.

A = R /100 * MV

- Where A is the absolute uncertainty
- R is the relative uncertainty
- MV is the measured value

## Absolute Uncertainty Definition

An absolute uncertainty is defined as the total uncertainty of a set of data based on the relative uncertainty and a measured value.

## Absolute Uncertainty Example

How to calculate absolute uncertainty?

**First, determine the relative uncertainty.**Calculate the relative uncertainty.

**Next, determine the measured value.**Calculate the measure or reported value.

**Finally, calculate the absolute uncertainty.**Calculate the absolute uncertainty using the formula above.

## FAQ

**What is absolute uncertainty?**

The absolute uncertainty is a value that provides a range of possible values when combined with a measured or reported value. In other words, if the measured value is 2 and the absolute uncertantainty is .5, then the range of possible values is 1.5-2.5 or 2+/- .5 .

**What is relative uncertainty?**

Relative uncertainty is the ratio of the absolute uncertainty to the measured value.