Decibel Calculator
Convert between ratio and decibels: dB = 10·log10(P₂/P₁) or 20·log10(V₂/V₁).
Input Data
Intensity
W/m²
Results
60dB
At a glance:dB = 10·log10(P₂/P₁) (power); 20·log10(V₂/V₁) (amplitude). Complements sound-intensity-level and acoustic-intensity.
Formula
dB = 10·log₁₀(P₂/P₁).
$$L = 10 \log_{10}\!\left(\dfrac{I}{I_0}\right)$$$$I_0 = 10^{-12}\,\text{W/m}^2$$How to Use
- Pick power/amp mode and enter two values.
- The tool returns the dB.
Case Studies
Power doubled
+3.01 dB.
FAQ
Power vs amplitude?
Amplitude ratio uses 20·log because power ∝ amplitude².
Related Tools
References
Content review: Calculatorism Science Team. Results are for reference only; please refer to the relevant authorities for the official figures.