dBu to Volts Converter
Convert RMS voltage between dBu and volts using the 0.775 V reference.
How to Convert dBu to Volts
dBu uses 0.775 volts RMS as its reference. This converter changes dBu values to volts and volts back to dBu for audio level comparisons.
Practical Example
0 dBu equals 0.775 V RMS, while +4 dBu is approximately 1.228 V RMS.
Factors That Affect Interpretation
The mathematical conversion uses the standard 0.775 V reference. Real equipment readings can also depend on waveform, measurement method and system conditions.
Frequently Asked Questions
What voltage is 0 dBu?
0 dBu equals 0.775 volts RMS.
What voltage is +4 dBu?
+4 dBu is approximately 1.228 volts RMS.
Is dBu the same as dBV?
No. dBu is referenced to 0.775 V, while dBV is referenced to 1 V.
Understanding dBu and Volts Conversion
dBu is a logarithmic voltage unit referenced to 0.775 volts RMS. It is widely used in professional audio because it provides a convenient way to express signal levels across equipment specifications.
Before converting, confirm that the source value is dBu and not dBV, since the reference voltage is different. The converted voltage describes signal amplitude only; actual power still depends on circuit impedance. For audio system alignment, use consistent RMS conventions and manufacturer reference levels.
Methodology and Practical Limits
dBu is referenced to approximately 0.775 volts RMS, so voltage is 0.775 × 10^(dBu/20). It is a voltage-level reference and does not by itself state delivered power unless impedance is also known.