Enter root-mean-square (RMS) voltage. To calculate the RMS voltage, you take a number of voltage readings, square them, add them all together, and then divide by the number of entries in the ...

More broadly, root mean square refers to a mathematical equation that's somewhat self-explanatory if you know what those terms mean, as it's the square root of a number set's mean square.

To calculate the RMS voltage, you take a number of voltage readings, square them, add them all together, and then divide by the number of entries in the average before taking the square root: .