What this calculator does
RMS Voltage & Current works out rMS, average and peak-to-peak values of a sinusoidal AC voltage or current from its peak value. Enter your own figures above and the answer updates as you type: nothing is fixed in the code, so the result reflects exactly the numbers you supply.
The formula this calculator evaluates is printed under the tool and explained below, so you can check the working by hand or reuse it in a spreadsheet.
The formula
FormulaV_rms = V_peak/√2; V_avg = 2V_peak/π (full-wave rectified); V_pp = 2V_peak
The inputs explained
| Field | What to enter |
|---|---|
| Peak value (V (or A)) | A number, measured in V (or A). Starts at 325. |
Worked examples
Every figure in the tables below is produced by this page’s own calculator at build time, so the numbers and the tool always agree. Select any row to load that scenario.
How the answer changes with peak value
Every other input is held at the calculator’s starting values while peak value varies. Select any row to load that scenario into the calculator.