Audio and dB Voltage Converter – dBV, dBu, dBm and Voltage Gain

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Audio & dB Voltage Converter

Convert between RMS voltage, dBV, dBu, voltage gain in dB, voltage ratio, and estimated dBm into a selected load resistance.

Input Parameters

Input Mode

Primary Value

Use Vrms, dBV, dBu, or Vin depending on selected mode.

Secondary Value / Vout

Used only in voltage gain mode.

Load Resistance

Used to estimate dBm from voltage.

Results

Voltage RMS

dBV

dBu

Estimated dBm

Voltage Gain

Conversion Note

Equations Used

dBV = 20 log10(Vrms / 1 V)

dBu = 20 log10(Vrms / 0.775 V)

Vrms from dBV = 10^(dBV/20)

Vrms from dBu = 0.775 × 10^(dBu/20)

Voltage Gain dB = 20 log10(Vout / Vin)

dBm = 10 log10((Vrms² / R) / 1 mW)

Frequently Asked Questions (FAQ)

Q1: What is dBV?
dBV is a voltage level referenced to 1 Vrms.

Q2: What is dBu?
dBu is a voltage level referenced to 0.775 Vrms, commonly used in audio systems.

Q3: Is dBm the same as dBV?
No. dBm is a power level and depends on load resistance, while dBV is a voltage level.

Q4: Why does load resistance matter for dBm?
Power equals Vrms²/R, so the same voltage produces different power into different loads.

Q5: Can this tool calculate amplifier gain?
Yes. Select voltage gain mode and enter Vin and Vout.

Q6: Is this for RMS voltage?
Yes. dBV and dBu are normally calculated from RMS voltage.

Disclaimer: This converter uses RMS voltage. Real audio measurements may involve balanced/unbalanced levels, impedance bridging, peak headroom, calibration standards, and measurement bandwidth.

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