Enter the initial power level and the final power level into the calculator to determine the Db gain.

## DB Gain Formula

The following formula is used to calculate a dB gain.

dB = 10log(P2/P1)
• Where dB is the decibel gain (decibels)
• P2 is the final power level (watts)
• P1 is the initial power level (watts)

To calculate a db gain, take the log of the ratio of the final power over the initial power, then multiply by 10.

## DB Gain Definition

What is a dB gain? A dB gain, also known as a decibel gain, is a measure of power increase that’s expressed as a log value of the ratio of the final power to the initial value.

## Example Problem

How to calculate dB gain?

1. First determine the initial power level.

For this example, the initial power level is 1,000 watts (1kW)

2. Next, determine the final power level.

After the system power had been increased to full power, the final power level is found to be 3,000 watts.

3. Finally, calculate the decibel gain.

Using the formula above, calculate the decibel gain. dB = 10 * log (3000/1000) = 10*log(3) = 4.771 decibels.