Calculate the root mean square of a set of values.
The root mean square weights larger values more heavily because they are squared first. It is the measure that preserves energy content, which is why AC voltages and currents are quoted as RMS. RMS equals the arithmetic mean only when all values are identical; the gap grows with variability.
Root Mean Square
RMS = √(Σxᵢ² ÷ n)
RMS = √(Σxᵢ² ÷ n) The root mean square weights larger values more heavily because they are squared first. It is the measure that preserves energy content, which is why AC voltages and currents are quoted as RMS.
RMS equals the arithmetic mean only when all values are identical; the gap grows with variability.
This calculator takes 4 inputs: Value 1, Value 2, Value 3, Value 4. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.