# 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).

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

$P_{in}=frac{P_{out}}{10^frac{G}{10}}$

$P_{out}=10^frac{G}{10}P_{in}$