This calculator estimates antenna gain using the ratio of output to input power.

Gain is calculated as: \[ \text{Gain (dB)} = 10 \times \log_{10} \left( \frac{P_{out}}{P_{in}} \right) \]

The result is shown in both linear scale (× multiplier) and decibels (dB). A higher gain means more efficient concentration of power in a given direction.