Enter the total number of milliamps (ma) and the total time (seconds) into the calculator to determine the mAs.

## mAs Formula

The following formula is used to calculate milliampere-seconds (mAs).

mAs = mA * t

- Where mAs is milliampere seconds
- mA is total milliamps
- t is total time (s)

## mAs Definition

**What is mAs? **

mAs is a unit of measure that is equal to one milliamp times one second. This unit of measure is most often used in the study of radiology to depict how much radiation is produced over a set amount of time.

## Example Problem

How to calculate mAs?

**First, determine the total milliamps the x-ray is producing.**For this example, the x-ray is emitting 300 milliamps (mA).

**Next, determine the total time the radiation is being emitted.**In this case, the x-ray takes a total time of .03 seconds.

**Finally, calculate the mAS.**Using the formula above, the mAs is calculated to be:

mAs = mA * t

mAs = 300 *.03

mAs = 9