Audio & acoustics

dBu dBV volt calculator

The calculator converts voltages into dBu or dBV and converts level information back into volts.

Updated on Apr 24, 2026 Calculator, calculation path and examples on one page

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Calculator

Calculation direction

Voltage in volts

Level value in dBu or dBV

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Examples

Typical professional line level.

tension: 1,228 V

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Typical consumer level.

tension: 0.316V

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Convert voltage to dBu.

Level in dBu: 4.00dB

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FAQ

What is the difference between dBu and dBV?

dBu refers to 0.775 volts, dBV to 1.0 volts. That's why the numerical values differ despite the same voltage.

What level is common for professional line level?

+4 dBu is often used as a reference. This corresponds to around 1.228 volts.

What level is common in consumer devices?

-10 dBV is often used. This corresponds to around 0.316 volts.

Can I use the calculator for balanced and unbalanced lines?

Yes. The conversion only refers to the voltage value. The signal type does not change the basic formula.

Why isn't 0 dBu equal to 0 dBV?

Because different reference voltages are used. 0 dBu corresponds to 0.775 volts, 0 dBV corresponds to 1.0 volts.

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Sources and notes

Formulas: dBu = 20 x log10(V / 0.775), dBV = 20 x log10(V / 1.0), V = Uref x 10^(dB / 20)
Note: Suitable for line level, studio level and measurement technology.