Power Gain

When referring to measurements of power or intensity, a ratio can be expressed in decibels (G) by evaluating ten times the base-10 logarithm of the ratio of the measured quantity (Pout) to the reference level (Pin).

G=10\log \left( \frac{P_{out}}{P_{in}} \right) P_{in}=\frac{P_{out}}{10^\frac{G}{10}} P_{out}=10^\frac{G}{10}P_{in}

More info: http://en.wikipedia.org/wiki/Decibel#Power

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