dBV to Volts RMS Converter

Of all the decibel flavors in audio, dBV is the simplest to undo: the reference is exactly 1 volt RMS, so the voltage equals 10 raised to (dBV/20) with no scaling constant at all. That is precisely what this page computes — one field takes the dBV value and the RMS voltage refreshes on every keystroke. Enter 0 and you get 1 V; enter 6 and you get 1.995262 V, since 6 dB in voltage terms is a factor of 1.9953; and every 20 dB step moves the decimal point one place.

The figure people look up most is consumer line level, minus 10 dBV. Type in minus 10 and the tool shows 0.316228 V, which is 10 to the power of minus 0.5 — the nominal level on the RCA outputs of home equipment. Comparing against professional gear takes care with units: plus 4 dBu equals 1.228 V, so the real gap between the two standards is about 11.8 dB of voltage (a factor of 3.88), not the 14 dB you would get by naively subtracting the labels, because dBu and dBV rest on different references. The fixed relation is dBV equals dBu minus 2.218.

This converter does not handle dBu (0.7746 V reference) or dBm (which needs a load impedance), and it does not run in reverse from volts to dBV — for that, compute 20 times log10 of the voltage. Results below 0.001 V switch to scientific notation with four decimals: minus 80 dBV displays as 1.0000e-4, meaning 100 microvolts. Large positive values work too (plus 40 dBV is 100 V), handy for amplifier output estimates. One behavioral detail: leaving the field empty is the same as typing 0, so the page shows 1 V instead of flagging the missing input.