Free Decibel Calculator
Convert sound intensity to decibels using dB = 10 * log10(I / I0) where I0 = 10^-12 W/m².
W/m²
Sound Level
90.0 dB
Decibel Scale
The decibel scale expresses sound intensity on a logarithmic scale relative to a reference intensity.
Formula
dB = 10 * log10(I / I_0)
where I_0 = 10^-12 W/m². Every 10 dB increase represents a tenfold increase in intensity. A 3 dB increase doubles the intensity.
Example Calculation
A sound with intensity 0.001 W/m².
- 01dB = 10 * log10(I / I_0)
- 02dB = 10 * log10(0.001 / 1e-12)
- 03dB = 10 * log10(1e9)
- 04dB = 10 * 9 = 90 dB
Frequently Asked Questions
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