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dB Converter Suite

Clean, offline conversions for audio/RF/acoustics. Change any field — everything updates instantly.

Electrical: dBV / dBu / dBm ↔ Vrms / Vpp (sine) / Watts

Ω

Assumes sine wave for Vrms↔Vpp (Vpp = 2·√2·Vrms). dBm is power-referenced (1 mW) and needs impedance to relate to volts.

Acoustic: dB SPL ↔ Pressure (Pa)

Reference for SPL is 20 µPa: SPL = 20·log10(p/20µPa).

Ratios: Gain (dB) ↔ Voltage Ratio ↔ Power Ratio

dB = 20·log10(V₂/V₁) = 10·log10(P₂/P₁) and P ratio = (V ratio)² (same impedance).

FAQ: dB, dBV, dBu, dBm, and SPL

dBV references 1.000 Vrms. dBu references 0.775 Vrms (historically 1 mW into 600 Ω). Both are voltage-based: dBV = 20·log10(V/1V), dBu = 20·log10(V/0.775V).

dBm is a power reference to 1 mW. To convert between dBm and volts you need load impedance Z, because P = V²/Z. We provide 50/75/600 Ω presets and a custom field.

For a sine wave: Vpp = 2·√2·Vrms ≈ 2.828·Vrms. This app assumes sine to keep conversions deterministic.

dBFS (digital full scale) needs a calibration: the converter must know the device’s full-scale Vrms. Without that, dBFS can’t map to volts absolutely.

No. Weightings are measurement filters, not constant offsets. This converter uses the unweighted SPL definition with a 20 µPa reference.