Conversion: Voltage V to dB dBu dBV and dBm
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• Conversion: voltage V → dB, dBu, dBV, and dBm •

Usually we measure AC voltage V as voltsRMS.

Voltage V:  volts (Root Mean Square RMS)
   
 
   
Voltage level L:  
L =  dBu reference: 0.775 V
L =  dBV reference: 1 V
L =  dBm > > >   ref. 1 mW at ohms

The index at decibel (dB) means u = unloaded, V = volt, and m = milliwatt. Some say: The "u" in dBu
implies also that the load impedance is unspecified, or unterminated and is likely to be high.
The index m at dB (decibel) means 1 milliwatt (power) as reference value for 0 dB.

If the reverse conversion dBm to volts is needed, go to the converter at the bottom.

What is dBu? A logarithmic voltage ratio with a reference voltage of V0= 0.7746 volt ≡ 0 dBu
What is dBV? A logarithmic voltage ratio with a reference voltage of V0 = 1.0000 volt ≡ 0 dBV
What is dBm? A logarithmic ratio with a reference power of P0 = 1.0000 milliwatt ≡ 0 dBm
The max. home recording level of −10 dBV means 0.3162 volts, that is −7.78 dBu
Level   Formula volt to level        Voltage   Formula level to volt

With the known impedance value you can convert voltage V to level dBm (power) and vice versa.

Voltage V   V RMS
Level L   dBm re 1 mW 
 Impedance Z   Ω
 
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