Convert between ratio gain $G$ and decibels $\mathrm{dB}$ using amplitude or power conventions. Amplitude mode uses $\mathrm{dB}=20,\log_{10}(G)$; Power mode uses $\mathrm{dB}=10,\log_{10}(G)$. Type in either input to update the other and the result. The plot and reference table track your selection; select Extend Plot Range to view a wider span.