Physics
Decibels per doubling
Works out at about 6.02 decibels, the useful rule that doubling the pressure adds roughly six decibels.
The Formula
dB = 20 x log(2)
Works out at about 6.02 decibels, the useful rule that doubling the pressure adds roughly six decibels.
| Symbol | Meaning | Unit | Notes |
|---|---|---|---|
| dL | Change in level | dB | Decibels added by doubling the pressure. |
What Each Symbol Means
dLdB
Change in level
Decibels added by doubling the pressure.
See It Worked With Real Numbers
A formula on its own does not tell you which number goes where. The how to calculate decibels page applies this equation to a concrete case, shows every intermediate step, and names the mistakes that produce a wrong answer even when the algebra is right.
Where This Formula Appears
This equation is the working core of How To Calculate Decibels, filed under Science. Every number the guide produces comes from substituting into this one line.