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Decibel (dB) Calculator

Convert between decibels and linear ratios.

CALCULATE

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Formulas

dB = 10 × log10(P1/P2)

For voltage: dB = 20 × log10(V1/V2). 3dB = double power. 6dB = double voltage.

Decibel Scale

0 dB: reference level. 3 dB: 2x power. 10 dB: 10x power. 20 dB: 100x power. Sound: 0 dB threshold, 60 dB conversation, 85 dB harmful, 120 dB pain, 140 dB jet engine.

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