dBu / dBV / Volt converter
Convert between dBu, dBV, dBm, volts RMS, volts peak-to-peak and power. Edit any field.
dBu
dBV
V
Vpp
dBm
W
Ω
How it works
dBu is referenced to 0.7746 V RMS (the voltage that dissipates 1 mW in 600 Ω). dBV is referenced to exactly 1 V RMS.
dBm is a power level referenced to 1 mW, so it depends on the impedance. Across 600 Ω, dBm and dBu have the same value; across 50 Ω (RF) they differ by about 10.8 dB.
Professional gear nominally runs at +4 dBu (1.228 V), consumer gear at −10 dBV (0.316 V). The two differ by about 11.8 dB.
Formulas
- V = 0.7746 · 10^(dBu / 20)
- V = 1 · 10^(dBV / 20)
- dBm = 10 · log₁₀( (V² / Z) / 1 mW )
- Vpp = 2·√2 · Vrms
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